diff --git a/.eslintrc.js b/.eslintrc.js
index cff9b38..1479b1e 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -23,5 +23,6 @@ module.exports = {
     ],
     'no-console': 'off',
     'prefer-arrow-callback': 'error'
-  }
+  },
+  'ignorePatterns': [ '**/*.js' ]
 };
diff --git a/.gitignore b/.gitignore
index d6fbad3..15dc38b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -72,4 +72,11 @@ ffmpeg/
 
 # Editors and IDE's
 *.swp
-.vscode/
+ts/*.js
+ts/*.d.ts
+examples/pnpm-lock.yaml
+examples/capture/
+*.torrent
+*.jpg
+scratch/*.h264
+scratch/*.wav
diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
index 404edc6..cacd253 100644
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@@ -21,6 +21,20 @@
             "cStandard": "c11",
             "cppStandard": "c++17",
             "intelliSenseMode": "msvc-x64"
+        },
+        {
+            "name": "Mac",
+            "includePath": [
+                "${workspaceFolder}/src",
+                "${HOME}/.nvm/versions/node/v16.14.2/include/node",
+                "/opt/homebrew/Cellar/ffmpeg/5.0/include"
+            ],
+            "defines": [],
+            "macFrameworkPath": [],
+            "compilerPath": "/opt/homebrew/bin/gcc-11",
+            "cStandard": "gnu17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "macos-gcc-arm64"
         }
     ],
     "version": 4
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..b9eaa7b
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,279 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+
+
+
+    {
+      "name": "scratch streamTest.ts",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./examples/streamTest.ts" ],
+      "cwd": "${workspaceFolder}/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+
+
+    
+
+    {
+      "name": "scratch decode_aac",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./decode_aac.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+
+    
+    {
+      "name": "scratch decode_avci",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./decode_avci.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+
+    
+    {
+      "name": "scratch decode_hevc",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./decode_hevc.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    
+
+
+    {
+      "name": "scratch decode_pcm",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./decode_pcm.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    
+
+    
+
+    
+
+
+    {
+      "name": "scratch stream_avci",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./stream_avci.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+
+
+    {
+      "name": "scratch stream_mux",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./stream_mux.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "/s/<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+
+
+    {
+      "name": "scratch stream_mp4",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [ "--nolazy", "-r", "ts-node/register" ],
+      "args": [ "./stream_mp4.ts" ],
+      "cwd": "${workspaceFolder}/scratch/",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    {
+      "name": "Launch streamTest",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [
+        "--nolazy",
+        "-r",
+        "ts-node/register"
+      ],
+      "args": [
+        "./examples/streamTest.ts"
+      ],
+      "cwd": "${workspaceFolder}",
+      "internalConsoleOptions": "openOnSessionStart",
+      // "skipFiles": ["<node_internals>/**", "node_modules/**"],
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    {
+      "name": "Launch jpeg_filter_app",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [
+        "--nolazy",
+        "-r",
+        "ts-node/register"
+      ],
+      "args": [
+        "./examples/jpeg_filter_app.ts"
+      ],
+      "cwd": "${workspaceFolder}",
+      "internalConsoleOptions": "openOnSessionStart",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    {
+      "name": "Launch make_mp4",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [
+        "--nolazy",
+        "-r",
+        "ts-node/register"
+      ],
+      "args": [
+        "./examples/make_mp4.ts",
+        "test.mp4"
+      ],
+      "cwd": "${workspaceFolder}",
+      "internalConsoleOptions": "openOnSessionStart",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    {
+      "name": "Launch jpeg_app",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [
+        "--nolazy",
+        "-r",
+        "ts-node/register"
+      ],
+      "args": [
+        "./examples/jpeg_app.ts"
+      ],
+      "cwd": "${workspaceFolder}",
+      "internalConsoleOptions": "openOnSessionStart",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    },
+    {
+      "name": "tape test",
+      "type": "node",
+      "request": "launch",
+      "runtimeArgs": [
+        "--nolazy",
+        "-r",
+        "ts-node/register"
+      ],
+      "args": [
+        "node_modules/tape/bin/tape",
+        "test/*.ts"
+      ],
+      "cwd": "${workspaceFolder}",
+      "internalConsoleOptions": "openOnSessionStart",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "env": {
+        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json",
+        "DEBUG": "*"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/beamstreams.js b/beamstreams.js
deleted file mode 100644
index 90e5163..0000000
--- a/beamstreams.js
+++ /dev/null
@@ -1,692 +0,0 @@
-/*
-  Aerostat Beam Coder - Node.js native bindings to FFmpeg
-  Copyright (C) 2019 Streampunk Media Ltd.
-
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-  https://www.streampunk.media/ mailto:furnace@streampunk.media
-  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
-*/
-
-const beamcoder = require('bindings')('beamcoder');
-const { Writable, Readable, Transform } = require('stream');
-
-const doTimings = false;
-const timings = [];
-
-function frameDicer(encoder, isAudio) {
-  let sampleBytes = 4; // Assume floating point 4 byte samples for now...
-  const numChannels = encoder.channels;
-  const dstNumSamples = encoder.frame_size;
-  let dstFrmBytes = dstNumSamples * sampleBytes;
-  const doDice = false === beamcoder.encoders()[encoder.name].capabilities.VARIABLE_FRAME_SIZE;
-
-  let lastFrm = null;
-  let lastBuf = [];
-  const nullBuf = [];
-  for (let b = 0; b < numChannels; ++b)
-    nullBuf.push(Buffer.alloc(0));
-
-  const addFrame = srcFrm => {
-    let result = [];
-    let dstFrm;
-    let curStart = 0;
-    if (!lastFrm) {
-      lastFrm = beamcoder.frame(srcFrm.toJSON());
-      lastBuf = nullBuf;
-      dstFrmBytes = dstNumSamples * sampleBytes;
-    }
-
-    if (lastBuf[0].length > 0)
-      dstFrm = beamcoder.frame(lastFrm.toJSON());
-    else
-      dstFrm = beamcoder.frame(srcFrm.toJSON());
-    dstFrm.nb_samples = dstNumSamples;
-    dstFrm.pkt_duration = dstNumSamples;
-
-    while (curStart + dstFrmBytes - lastBuf[0].length <= srcFrm.nb_samples * sampleBytes) {
-      const resFrm = beamcoder.frame(dstFrm.toJSON());
-      resFrm.data = lastBuf.map((d, i) => 
-        Buffer.concat([
-          d, srcFrm.data[i].slice(curStart, curStart + dstFrmBytes - d.length)],
-        dstFrmBytes));
-      result.push(resFrm);
-
-      dstFrm.pts += dstNumSamples;
-      dstFrm.pkt_dts += dstNumSamples;
-      curStart += dstFrmBytes - lastBuf[0].length;
-      lastFrm.pts = 0;
-      lastFrm.pkt_dts = 0;
-      lastBuf = nullBuf;
-    }
-
-    lastFrm.pts = dstFrm.pts;
-    lastFrm.pkt_dts = dstFrm.pkt_dts;
-    lastBuf = srcFrm.data.map(d => d.slice(curStart, srcFrm.nb_samples * sampleBytes));
-
-    return result;
-  };
-
-  const getLast = () => {
-    let result = [];
-    if (lastBuf[0].length > 0) {
-      const resFrm = beamcoder.frame(lastFrm.toJSON());
-      resFrm.data = lastBuf.map(d => d.slice(0));
-      resFrm.nb_samples = lastBuf[0].length / sampleBytes;
-      resFrm.pkt_duration = resFrm.nb_samples;
-      lastFrm.pts = 0;
-      lastBuf = nullBuf;
-      result.push(resFrm);
-    }
-    return result;
-  };
-
-  this.dice = (frames, flush = false) => {
-    if (isAudio && doDice) {
-      let result = frames.reduce((muxFrms, frm) => {
-        addFrame(frm).forEach(f => muxFrms.push(f));
-        return muxFrms;
-      }, []);
-  
-      if (flush)
-        getLast().forEach(f => result.push(f));
-  
-      return result;
-    }
-  
-    return frames;
-  };
-}
-
-function serialBalancer(numStreams) {
-  let pending = [];
-  // initialise with negative ts and no pkt
-  // - there should be no output until each stream has sent its first packet
-  for (let s = 0; s < numStreams; ++s)
-    pending.push({ ts: -Number.MAX_VALUE, streamIndex: s });
-
-  const adjustTS = (pkt, srcTB, dstTB) => {
-    const adj = (srcTB[0] * dstTB[1]) / (srcTB[1] * dstTB[0]);
-    pkt.pts = Math.round(pkt.pts * adj);
-    pkt.dts = Math.round(pkt.dts * adj);
-    pkt.duration > 0 ? Math.round(pkt.duration * adj) : Math.round(adj);
-  };
-    
-  const pullPkts = (pkt, streamIndex, ts) => {
-    return new Promise(resolve => {
-      Object.assign(pending[streamIndex], { pkt: pkt, ts: ts, resolve: resolve });
-      const minTS = pending.reduce((acc, pend) => Math.min(acc, pend.ts), Number.MAX_VALUE);
-      // console.log(streamIndex, pending.map(p => p.ts), minTS);
-      const nextPend = pending.find(pend => pend.pkt && (pend.ts === minTS));
-      if (nextPend) nextPend.resolve(nextPend.pkt);
-      if (!pkt) resolve();
-    });
-  };
-
-  this.writePkts = (packets, srcStream, dstStream, writeFn, final = false) => {
-    if (packets && packets.packets.length) {
-      return packets.packets.reduce(async (promise, pkt) => {
-        await promise;
-        pkt.stream_index = dstStream.index;
-        adjustTS(pkt, srcStream.time_base, dstStream.time_base);
-        const pktTS = pkt.pts * dstStream.time_base[0] / dstStream.time_base[1];
-        return writeFn(await pullPkts(pkt, dstStream.index, pktTS));
-      }, Promise.resolve());
-    } else if (final)
-      return pullPkts(null, dstStream.index, Number.MAX_VALUE);
-  };
-}
-
-function parallelBalancer(params, streamType, numStreams) {
-  let resolveGet = null;
-  const tag = 'video' === streamType ? 'v' : 'a';
-  const pending = [];
-  // initialise with negative ts and no pkt
-  // - there should be no output until each stream has sent its first packet
-  for (let s = 0; s < numStreams; ++s)
-    pending.push({ ts: -Number.MAX_VALUE, streamIndex: s });
-
-  const makeSet = resolve => {
-    if (resolve) {
-      // console.log('makeSet', pending.map(p => p.ts));
-      const nextPends = pending.every(pend => pend.pkt) ? pending : null;
-      const final = pending.filter(pend => true === pend.final);
-      if (nextPends) {
-        nextPends.forEach(pend => pend.resolve());
-        resolve({
-          value: nextPends.map(pend => {
-            return { name: `in${pend.streamIndex}:${tag}`, frames: [ pend.pkt ] }; }), 
-          done: false });
-        resolveGet = null;
-        pending.forEach(pend => Object.assign(pend, { pkt: null, ts: Number.MAX_VALUE }));
-      } else if (final.length > 0) {
-        final.forEach(f => f.resolve());
-        resolve({ done: true });
-      } else {
-        resolveGet = resolve;
-      }
-    }
-  };
-
-  const pushPkt = async (pkt, streamIndex, ts) =>
-    new Promise(resolve => {
-      Object.assign(pending[streamIndex], { pkt: pkt, ts: ts, final: pkt ? false : true, resolve: resolve });
-      makeSet(resolveGet);
-    });
-
-  const pullSet = async () => new Promise(resolve => makeSet(resolve));
-
-  const readStream = new Readable({
-    objectMode: true,
-    highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
-    read() {
-      (async () => {
-        const start = process.hrtime();
-        const reqTime = start[0] * 1e3 + start[1] / 1e6;
-        const result = await pullSet();
-        if (result.done)
-          this.push(null);
-        else {
-          result.value.timings = result.value[0].frames[0].timings;
-          result.value.timings[params.name] = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
-          this.push(result.value);
-        }
-      })();
-    },
-  });
-
-  readStream.pushPkts = (packets, stream, streamIndex, final = false) => {
-    if (packets && packets.frames.length) {
-      return packets.frames.reduce(async (promise, pkt) => {
-        await promise;
-        const ts = pkt.pts * stream.time_base[0] / stream.time_base[1];
-        pkt.timings = packets.timings;
-        return pushPkt(pkt, streamIndex, ts);
-      }, Promise.resolve());
-    } else if (final) {
-      return pushPkt(null, streamIndex, Number.MAX_VALUE);
-    }
-  };
-
-  return readStream;
-}
-
-function teeBalancer(params, numStreams) {
-  let resolvePush = null;
-  const pending = [];
-  for (let s = 0; s < numStreams; ++s)
-    pending.push({ frames: null, resolve: null, final: false });
-  
-  const pullFrame = async index => {
-    return new Promise(resolve => {
-      if (pending[index].frames) {
-        resolve({ value: pending[index].frames, done: false });
-        Object.assign(pending[index], { frames: null, resolve: null });
-      } else if (pending[index].final)
-        resolve({ done: true });
-      else
-        pending[index].resolve = resolve;
-
-      if (resolvePush && pending.every(p => null === p.frames)) {
-        resolvePush();
-        resolvePush = null;
-      }
-    });
-  };
-
-  const readStreams = [];
-  for (let s = 0; s < numStreams; ++s)
-    readStreams.push(new Readable({
-      objectMode: true,
-      highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
-      read() {
-        (async () => {
-          const start = process.hrtime();
-          const reqTime = start[0] * 1e3 + start[1] / 1e6;
-          const result = await pullFrame(s);
-          if (result.done)
-            this.push(null);
-          else {
-            result.value.timings[params.name] = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
-            this.push(result.value);
-          }
-        })();
-      },
-    }));
-
-  readStreams.pushFrames = frames => {
-    return new Promise(resolve => {
-      pending.forEach((p, index) => {
-        if (frames.length)
-          p.frames = frames[index].frames;
-        else
-          p.final = true;
-      });
-
-      pending.forEach(p => {
-        if (p.resolve) {
-          if (p.frames) {
-            p.frames.timings = frames.timings;
-            p.resolve({ value: p.frames, done: false });
-          } else if (p.final)
-            p.resolve({ done: true });
-        }
-        Object.assign(p, { frames: null, resolve: null });
-      });
-      resolvePush = resolve;
-    });
-  };
-
-  return readStreams;
-}
-
-function transformStream(params, processFn, flushFn, reject) {
-  return new Transform({
-    objectMode: true,
-    highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
-    transform(val, encoding, cb) {
-      (async () => {
-        const start = process.hrtime();
-        const reqTime = start[0] * 1e3 + start[1] / 1e6;
-        const result = await processFn(val);
-        result.timings = val.timings;
-        if (result.timings)
-          result.timings[params.name] = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
-        cb(null, result);
-      })().catch(cb);
-    },
-    flush(cb) {
-      (async () => {
-        const result = flushFn ? await flushFn() : null;
-        if (result) result.timings = {};
-        cb(null, result);
-      })().catch(cb);
-    }
-  }).on('error', err => reject(err));
-}
-
-const calcStats = (arr, elem, prop) => {
-  const mean = arr.reduce((acc, cur) => cur[elem] ? acc + cur[elem][prop] : acc, 0) / arr.length;
-  const stdDev = Math.pow(arr.reduce((acc, cur) => cur[elem] ? acc + Math.pow(cur[elem][prop] - mean, 2) : acc, 0) / arr.length, 0.5);
-  const max = arr.reduce((acc, cur) => cur[elem] ? Math.max(cur[elem][prop], acc) : acc, 0);
-  const min = arr.reduce((acc, cur) => cur[elem] ? Math.min(cur[elem][prop], acc) : acc, Number.MAX_VALUE);
-  return { mean: mean, stdDev: stdDev, max: max, min: min };
-};
-
-function writeStream(params, processFn, finalFn, reject) {
-  return new Writable({
-    objectMode: true,
-    highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
-    write(val, encoding, cb) {
-      (async () => {
-        const start = process.hrtime();
-        const reqTime = start[0] * 1e3 + start[1] / 1e6;
-        const result = await processFn(val);
-        if ('mux' === params.name) {
-          const pktTimings = val.timings;
-          pktTimings[params.name] = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
-          if (doTimings)
-            timings.push(pktTimings);
-        }
-        cb(null, result);
-      })().catch(cb);
-    },
-    final(cb) {
-      (async () => {
-        const result = finalFn ? await finalFn() : null;
-        if (doTimings && ('mux' === params.name)) {
-          const elapsedStats = {};
-          Object.keys(timings[0]).forEach(k => elapsedStats[k] = calcStats(timings.slice(10, -10), k, 'elapsed'));
-          console.log('elapsed:');
-          console.table(elapsedStats);
-
-          const absArr = timings.map(t => {
-            const absDelays = {};
-            const keys = Object.keys(t);
-            keys.forEach((k, i) => absDelays[k] = { reqDelta: i > 0 ? t[k].reqTime - t[keys[i-1]].reqTime : 0 });
-            return absDelays;
-          });
-          const absStats = {};
-          Object.keys(absArr[0]).forEach(k => absStats[k] = calcStats(absArr.slice(10, -10), k, 'reqDelta'));
-          console.log('request time delta:');
-          console.table(absStats);
-
-          const totalsArr = timings.map(t => { 
-            const total = (t.mux && t.read) ? t.mux.reqTime - t.read.reqTime + t.mux.elapsed : 0;
-            return { total: { total: total }};
-          });
-          console.log('total time:');
-          console.table(calcStats(totalsArr.slice(10, -10), 'total', 'total'));
-        }
-        cb(null, result);
-      })().catch(cb);
-    }
-  }).on('error', err => reject(err));
-}
-
-function readStream(params, demuxer, ms, index) {
-  const time_base = demuxer.streams[index].time_base;
-  const end_pts = ms ? ms.end * time_base[1] / time_base[0] : Number.MAX_SAFE_INTEGER;
-  async function getPacket() {
-    let packet = null;
-    do { packet = await demuxer.read(); }
-    while (packet && packet.stream_index !== index);
-    return packet;
-  }
-
-  return new Readable({
-    objectMode: true,
-    highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
-    read() {
-      (async () => {
-        const start = process.hrtime();
-        const reqTime = start[0] * 1e3 + start[1] / 1e6;
-        const packet = await getPacket();
-        if (packet && (packet.pts < end_pts)) {
-          packet.timings = {};
-          packet.timings.read = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
-          this.push(packet);
-        } else
-          this.push(null);
-      })();
-    }
-  });
-}
-
-function createBeamWritableStream(params, governor) {
-  const beamStream = new Writable({
-    highWaterMark: params.highwaterMark || 16384,
-    write: (chunk, encoding, cb) => {
-      (async () => {
-        await governor.write(chunk);
-        cb();
-      })();
-    }
-  });
-  return beamStream;
-}
-
-function demuxerStream(params) {
-  const governor = new beamcoder.governor({});
-  const stream = createBeamWritableStream(params, governor);
-  stream.on('finish', () => governor.finish());
-  stream.on('error', console.error);
-  stream.demuxer = options => {
-    options.governor = governor;
-    // delay initialisation of demuxer until stream has been written to - avoids lock-up
-    return new Promise(resolve => setTimeout(async () => resolve(await beamcoder.demuxer(options)), 20));
-  };
-  return stream;
-}
-
-function createBeamReadableStream(params, governor) {
-  const beamStream = new Readable({
-    highWaterMark: params.highwaterMark || 16384,
-    read: size => {
-      (async () => {
-        const chunk = await governor.read(size);
-        if (0 === chunk.length)
-          beamStream.push(null);
-        else
-          beamStream.push(chunk);
-      })();
-    }
-  });
-  return beamStream;
-}
-
-function muxerStream(params) {
-  const governor = new beamcoder.governor({ highWaterMark: 1 });
-  const stream = createBeamReadableStream(params, governor);
-  stream.on('end', () => governor.finish());
-  stream.on('error', console.error);
-  stream.muxer = options => {
-    options.governor = governor;
-    return beamcoder.muxer(options);
-  };
-  return stream;
-}
-
-async function makeSources(params) {
-  if (!params.video) params.video = [];
-  if (!params.audio) params.audio = [];
-
-  params.video.forEach(p => p.sources.forEach(src => {
-    if (src.input_stream) {
-      const demuxerStream = beamcoder.demuxerStream({ highwaterMark: 1024 });
-      src.input_stream.pipe(demuxerStream);
-      src.format = demuxerStream.demuxer({ iformat: src.iformat, options: src.options });
-    } else
-      src.format = beamcoder.demuxer({ url: src.url, iformat: src.iformat, options: src.options });
-  }));
-  params.audio.forEach(p => p.sources.forEach(src => {
-    if (src.input_stream) {
-      const demuxerStream = beamcoder.demuxerStream({ highwaterMark: 1024 });
-      src.input_stream.pipe(demuxerStream);
-      src.format = demuxerStream.demuxer({ iformat: src.iformat, options: src.options });
-    } else
-      src.format = beamcoder.demuxer({ url: src.url, iformat: src.iformat, options: src.options });
-  }));
-
-  await params.video.reduce(async (promise, p) => {
-    await promise;
-    return p.sources.reduce(async (promise, src) => {
-      await promise;
-      src.format = await src.format;
-      if (src.ms && !src.input_stream)
-        src.format.seek({ time: src.ms.start });
-      return src.format;
-    }, Promise.resolve());
-  }, Promise.resolve());
-  await params.audio.reduce(async (promise, p) => {
-    await promise;
-    return p.sources.reduce(async (promise, src) => {
-      await promise;
-      src.format = await src.format;
-      if (src.ms && !src.input_stream)
-        src.format.seek({ time: src.ms.start });
-      return src.format;
-    }, Promise.resolve());
-  }, Promise.resolve());
-
-  params.video.forEach(p => p.sources.forEach(src => 
-    src.stream = readStream({ highWaterMark : 1 }, src.format, src.ms, src.streamIndex)));
-  params.audio.forEach(p => p.sources.forEach(src => 
-    src.stream = readStream({ highWaterMark : 1 }, src.format, src.ms, src.streamIndex)));
-}
-
-function runStreams(streamType, sources, filterer, streams, mux, muxBalancer) {
-  return new Promise((resolve, reject) => {
-    if (!sources.length)
-      return resolve();
-
-    const timeBaseStream = sources[0].format.streams[sources[0].streamIndex];
-    const filterBalancer = parallelBalancer({ name: 'filterBalance', highWaterMark : 1 }, streamType, sources.length);
-
-    sources.forEach((src, srcIndex) => {
-      const decStream = transformStream({ name: 'decode', highWaterMark : 1 },
-        pkts => src.decoder.decode(pkts), () => src.decoder.flush(), reject);
-      const filterSource = writeStream({ name: 'filterSource', highWaterMark : 1 },
-        pkts => filterBalancer.pushPkts(pkts, src.format.streams[src.streamIndex], srcIndex),
-        () => filterBalancer.pushPkts(null, src.format.streams[src.streamIndex], srcIndex, true), reject);
-
-      src.stream.pipe(decStream).pipe(filterSource);
-    });
-
-    const streamTee = teeBalancer({ name: 'streamTee', highWaterMark : 1 }, streams.length);
-    const filtStream = transformStream({ name: 'filter', highWaterMark : 1 }, frms => {
-      if (filterer.cb) filterer.cb(frms[0].frames[0].pts);
-      return filterer.filter(frms);
-    }, () => {}, reject);
-    const streamSource = writeStream({ name: 'streamSource', highWaterMark : 1 },
-      frms => streamTee.pushFrames(frms), () => streamTee.pushFrames([], true), reject);
-
-    filterBalancer.pipe(filtStream).pipe(streamSource);
-
-    streams.forEach((str, i) => {
-      const dicer = new frameDicer(str.encoder, 'audio' === streamType);
-      const diceStream = transformStream({ name: 'dice', highWaterMark : 1 },
-        frms => dicer.dice(frms), () => dicer.dice([], true), reject);
-      const encStream = transformStream({ name: 'encode', highWaterMark : 1 },
-        frms => str.encoder.encode(frms), () => str.encoder.flush(), reject);
-      const muxStream = writeStream({ name: 'mux', highWaterMark : 1 },
-        pkts => muxBalancer.writePkts(pkts, timeBaseStream, str.stream, pkts => mux.writeFrame(pkts)),
-        () => muxBalancer.writePkts(null, timeBaseStream, str.stream, pkts => mux.writeFrame(pkts), true), reject);
-      muxStream.on('finish', resolve);
-
-      streamTee[i].pipe(diceStream).pipe(encStream).pipe(muxStream);
-    });
-  });
-}
-
-async function makeStreams(params) {
-  params.video.forEach(p => {
-    p.sources.forEach(src =>
-      src.decoder = beamcoder.decoder({ demuxer: src.format, stream_index: src.streamIndex }));
-  });
-  params.audio.forEach(p => {
-    p.sources.forEach(src =>
-      src.decoder = beamcoder.decoder({ demuxer: src.format, stream_index: src.streamIndex }));
-  });
-
-  params.video.forEach(p => {
-    p.filter = beamcoder.filterer({
-      filterType: 'video',
-      inputParams: p.sources.map((src, i) => {
-        const stream = src.format.streams[src.streamIndex];
-        return {
-          name: `in${i}:v`,
-          width: stream.codecpar.width,
-          height: stream.codecpar.height,
-          pixelFormat: stream.codecpar.format,
-          timeBase: stream.time_base,
-          pixelAspect: stream.sample_aspect_ratio };
-      }),
-      outputParams: p.streams.map((str, i) => { return { name: `out${i}:v`, pixelFormat: str.codecpar.format }; }),
-      filterSpec: p.filterSpec });
-  });
-  const vidFilts = await Promise.all(params.video.map(p => p.filter));
-  params.video.forEach((p, i) => p.filter = vidFilts[i]);
-  // params.video.forEach(p => console.log(p.filter.graph.dump()));
-
-  params.audio.forEach(p => {
-    p.filter = beamcoder.filterer({
-      filterType: 'audio',
-      inputParams: p.sources.map((src, i) => {
-        const stream = src.format.streams[src.streamIndex];
-        return {
-          name: `in${i}:a`,
-          sampleRate: src.decoder.sample_rate,
-          sampleFormat: src.decoder.sample_fmt,
-          channelLayout: src.decoder.channel_layout,
-          timeBase: stream.time_base };
-      }),
-      outputParams: p.streams.map((str, i) => { 
-        return { 
-          name: `out${i}:a`,
-          sampleRate: str.codecpar.sample_rate,
-          sampleFormat: str.codecpar.format,
-          channelLayout: str.codecpar.channel_layout }; }),
-      filterSpec: p.filterSpec });
-  });
-  const audFilts = await Promise.all(params.audio.map(p => p.filter));
-  params.audio.forEach((p, i) => p.filter = audFilts[i]);
-  // params.audio.forEach(p => console.log(p.filter.graph.dump()));
-
-  let mux;
-  if (params.out.output_stream) {
-    let muxerStream = beamcoder.muxerStream({ highwaterMark: 1024 });
-    muxerStream.pipe(params.out.output_stream);
-    mux = muxerStream.muxer({ format_name: params.out.formatName });
-  } else
-    mux = beamcoder.muxer({ format_name: params.out.formatName });
-
-  params.video.forEach(p => {
-    p.streams.forEach((str, i) => {
-      const encParams = p.filter.graph.filters.find(f => f.name === `out${i}:v`).inputs[0];
-      str.encoder = beamcoder.encoder({
-        name: str.name,
-        width: encParams.w,
-        height: encParams.h,
-        pix_fmt: encParams.format,
-        sample_aspect_ratio: encParams.sample_aspect_ratio,
-        time_base: encParams.time_base,
-        // framerate: [encParams.time_base[1], encParams.time_base[0]],
-        // bit_rate: 2000000,
-        // gop_size: 10,
-        // max_b_frames: 1,
-        // priv_data: { preset: 'slow' }
-        priv_data: { crf: 23 } }); // ... more required ...
-    });
-  });
-
-  params.audio.forEach(p => {
-    p.streams.forEach((str, i) => {
-      const encParams = p.filter.graph.filters.find(f => f.name === `out${i}:a`).inputs[0];
-      str.encoder = beamcoder.encoder({
-        name: str.name,
-        sample_fmt: encParams.format,
-        sample_rate: encParams.sample_rate,
-        channel_layout: encParams.channel_layout,
-        flags: { GLOBAL_HEADER: mux.oformat.flags.GLOBALHEADER } });
-      
-      str.codecpar.frame_size = str.encoder.frame_size;
-    });
-  });
-
-  params.video.forEach(p => {
-    p.streams.forEach(str => {
-      str.stream = mux.newStream({ 
-        name: str.name,
-        time_base: str.time_base,
-        interleaved: true }); // Set to false for manual interleaving, true for automatic
-      Object.assign(str.stream.codecpar, str.codecpar);
-    });
-  });
-
-  params.audio.forEach(p => {
-    p.streams.forEach(str => {
-      str.stream = mux.newStream({
-        name: str.name,
-        time_base: str.time_base,
-        interleaved: true }); // Set to false for manual interleaving, true for automatic
-      Object.assign(str.stream.codecpar, str.codecpar);
-    });
-  });
-
-  return {
-    run: async () => {
-      await mux.openIO({
-        url: params.out.url ? params.out.url : '',
-        flags: params.out.flags ? params.out.flags : {}
-      });
-      await mux.writeHeader({ options: params.out.options ? params.out.options : {} });
-
-      const muxBalancer = new serialBalancer(mux.streams.length);
-      const muxStreamPromises = [];
-      params.video.forEach(p => muxStreamPromises.push(runStreams('video', p.sources, p.filter, p.streams, mux, muxBalancer)));
-      params.audio.forEach(p => muxStreamPromises.push(runStreams('audio', p.sources, p.filter, p.streams, mux, muxBalancer)));
-      await Promise.all(muxStreamPromises);
-
-      await mux.writeTrailer();
-    }
-  };
-}
-
-module.exports = {
-  demuxerStream,
-  muxerStream,
-  makeSources,
-  makeStreams
-};
diff --git a/examples/encode_h264.js b/examples/encode_h264.ts
similarity index 92%
rename from examples/encode_h264.js
rename to examples/encode_h264.ts
index 8041baf..dce52f3 100644
--- a/examples/encode_h264.js
+++ b/examples/encode_h264.ts
@@ -26,8 +26,8 @@
   Output can be viewed in VLC. Make sure "All Files" is selected to see the file.
 */
 
-const beamcoder = require('../index.js'); // Use require('beamcoder') externally
-const fs = require('fs');
+import beamcoder from '..'; // Use require('beamcoder') externally
+import fs from 'fs';
 
 let endcode = Buffer.from([0, 0, 1, 0xb7]);
 
@@ -38,13 +38,13 @@ async function run() {
     width: 1920,
     height: 1080,
     bit_rate: 2000000,
-    time_base: [1, 25],
-    framerate: [25, 1],
+    time_base: [1, 25] as [number, number],
+    framerate: [25, 1] as [number, number],
     gop_size: 10,
     max_b_frames: 1,
     pix_fmt: 'yuv420p',
-    priv_data: { preset: 'slow' }
-  };
+    priv_data: { preset: 'slow' },
+  } as const;
 
   let encoder = beamcoder.encoder(encParams);
   console.log('Encoder', encoder);
diff --git a/examples/jpeg_app.js b/examples/jpeg_app.js
deleted file mode 100644
index 1768ce2..0000000
--- a/examples/jpeg_app.js
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
-  Aerostat Beam Coder - Node.js native bindings for FFmpeg.
-  Copyright (C) 2019  Streampunk Media Ltd.
-
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-  https://www.streampunk.media/ mailto:furnace@streampunk.media
-  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
-*/
-
-/* Main example from the README.md. Run in a folder of media files.
-
-   Only supports 8-bit YUV 4:2:2 or 4:2:0 pixel formats.
-*/
-
-const beamcoder = require('../index.js'); // Use require('beamcoder') externally
-const Koa = require('koa'); // Add koa to package.json dependencies
-const app = new Koa();
-
-app.use(async (ctx) => { // Assume HTTP GET with path /<file_name>/<time_in_s>
-  let parts = ctx.path.split('/'); // Split the path into filename and time
-  if ((parts.length < 3) || (isNaN(+parts[2]))) return; // Ignore favicon etc..
-  let dm = await beamcoder.demuxer('file:' + parts[1]); // Probe the file
-  await dm.seek({ time: +parts[2] }); // Seek to the closest keyframe to time
-  let packet = await dm.read(); // Find the next video packet (assumes stream 0)
-  for ( ; packet.stream_index !== 0 ; packet = await dm.read() );
-  let dec = beamcoder.decoder({ demuxer: dm, stream_index: 0 }); // Create a decoder
-  let decResult = await dec.decode(packet); // Decode the frame
-  if (decResult.frames.length === 0) // Frame may be buffered, so flush it out
-    decResult = await dec.flush();
-  // Filtering could be used to transform the picture here, e.g. scaling
-  let enc = beamcoder.encoder({ // Create an encoder for JPEG data
-    name : 'mjpeg', // FFmpeg does not have an encoder called 'jpeg'
-    width : dec.width,
-    height: dec.height,
-    pix_fmt: dec.pix_fmt.indexOf('422') >= 0 ? 'yuvj422p' : 'yuvj420p',
-    time_base: [1, 1] });
-  let jpegResult = await enc.encode(decResult.frames[0]); // Encode the frame
-  await enc.flush(); // Tidy the encoder
-  ctx.type = 'image/jpeg'; // Set the Content-Type of the data
-  ctx.body = jpegResult.packets[0].data; // Return the JPEG image data
-});
-
-app.listen(3000); // Start the server on port 3000
diff --git a/examples/jpeg_app.ts b/examples/jpeg_app.ts
new file mode 100644
index 0000000..84dcbca
--- /dev/null
+++ b/examples/jpeg_app.ts
@@ -0,0 +1,85 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings for FFmpeg.
+  Copyright (C) 2019  Streampunk Media Ltd.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+/* Main example from the README.md. Run in a folder of media files.
+
+   Only supports 8-bit YUV 4:2:2 or 4:2:0 pixel formats.
+*/
+
+import beamcoder from '..'; // Use require('beamcoder') externally
+import Koa from 'koa'; // Add koa to package.json dependencies
+import fs from 'fs';
+import path from 'path';
+const app = new Koa();
+
+app.use(async (ctx) => { // Assume HTTP GET with path /<file_name>/<time_in_s>
+
+  if (ctx.path === '/') {
+    let list = await fs.promises.readdir('.')
+    list = list.filter(a=> a.toLowerCase().endsWith('.mp4'));
+    ctx.type = 'text/html';
+    ctx.body = `<html><body>
+    currenty available files: <ul>${list.map(f => `<li><a href="${f}/1">${f}</a></li>`).join(' ')}</ul>
+    Add files in : <b>${path.resolve('.')}</b> for more tests
+    </body></html>`;
+    return;
+  }
+
+  let parts = ctx.path.split('/'); // Split the path into filename and time
+  if ((parts.length < 3) || (isNaN(+parts[2]))) {
+    ctx.status = 404;
+    ctx.type = 'text/html';
+    ctx.body = `<html><body>
+    expected path: /<file_name>/<time_in_s>
+    </body></html>`;
+    return; // Ignore favicon etc..
+  }
+
+  try {
+    if ((parts.length < 3) || (isNaN(+parts[2]))) return; // Ignore favicon etc..
+    let demuxer = await beamcoder.demuxer('file:' + parts[1]); // Probe the file
+    await demuxer.seek({ time: +parts[2] }); // Seek to the closest keyframe to time
+    let packet = await demuxer.read(); // Find the next video packet (assumes stream 0)
+    for ( ; packet.stream_index !== 0 ; packet = await demuxer.read() );
+    let dec = beamcoder.decoder({ demuxer, stream_index: 0 }); // Create a decoder
+    let decResult = await dec.decode(packet); // Decode the frame
+    if (decResult.frames.length === 0) // Frame may be buffered, so flush it out
+      decResult = await dec.flush();
+    // Filtering could be used to transform the picture here, e.g. scaling
+    let enc = beamcoder.encoder({ // Create an encoder for JPEG data
+      name : 'mjpeg', // FFmpeg does not have an encoder called 'jpeg'
+      width : dec.width,
+      height: dec.height,
+      pix_fmt: dec.pix_fmt.indexOf('422') >= 0 ? 'yuvj422p' : 'yuvj420p',
+      time_base: [1, 1] });
+    let jpegResult = await enc.encode(decResult.frames[0]); // Encode the frame
+    await enc.flush(); // Tidy the encoder
+    ctx.type = 'image/jpeg'; // Set the Content-Type of the data
+    ctx.body = jpegResult.packets[0].data; // Return the JPEG image data
+  } catch (e) {
+    ctx.type = 'application/json';
+    ctx.status = 500;
+    ctx.body = JSON.stringify(e);
+  }
+});
+
+app.listen(3000); // Start the server on port 3000
+console.log('listening port 3000');
diff --git a/examples/jpeg_filter_app.js b/examples/jpeg_filter_app.ts
similarity index 72%
rename from examples/jpeg_filter_app.js
rename to examples/jpeg_filter_app.ts
index e9d45f3..3d66960 100644
--- a/examples/jpeg_filter_app.js
+++ b/examples/jpeg_filter_app.ts
@@ -24,12 +24,13 @@
    Will convert source pixel formats to 8-bit YUV 4:2:2
 */
 
-const beamcoder = require('../index.js'); // Use require('beamcoder') externally
-const Koa = require('koa'); // Add koa to package.json dependencies
+import beamcoder from '..'; // Use require('beamcoder') externally
+import Koa from 'koa'; // Add koa to package.json dependencies
 const app = new Koa();
 
 app.use(async (ctx) => { // Assume HTTP GET with path /<file_name>/<time_in_s>
-  let parts = ctx.path.split('/'); // Split the path into filename and time
+  try {
+    let parts = ctx.path.split('/'); // Split the path into filename and time
   if ((parts.length < 3) || (isNaN(+parts[2]))) return; // Ignore favicon etc..
   let dm = await beamcoder.demuxer('file:' + parts[1]); // Probe the file
   await dm.seek({ time: +parts[2] }); // Seek to the closest keyframe to time
@@ -41,10 +42,10 @@ app.use(async (ctx) => { // Assume HTTP GET with path /<file_name>/<time_in_s>
     decResult = await dec.flush();
 
   // audio test
-  const aindex = 2;
-  const audStr = dm.streams[aindex];
+  const streamSoundIdx = dm.streams.findIndex(stream => stream.codecpar.codec_type === 'audio');
+  const audStr = dm.streams[streamSoundIdx];
   // console.log(audStr);
-  let adec = beamcoder.decoder({ demuxer: dm, stream_index: aindex }); // Create a decoder
+  let adec = beamcoder.decoder({ demuxer: dm, stream_index: streamSoundIdx }); // Create a decoder
   // console.log(adec);
   let apkt = await dm.read();
   let afrm = await adec.decode(apkt);
@@ -54,26 +55,29 @@ app.use(async (ctx) => { // Assume HTTP GET with path /<file_name>/<time_in_s>
     sample_fmt: 'fltp',
     sample_rate: 48000,
     channels: 1,
-    channel_layout: 'mono', });
-
+    channel_layout: 'mono'
+  });
   const audFilt = await beamcoder.filterer({ // Create a filterer for audio
     filterType: 'audio',
     inputParams: [{
       sampleRate: audStr.codecpar.sample_rate,
       sampleFormat: adec.sample_fmt,
       channelLayout: audStr.codecpar.channel_layout,
-      timeBase: audStr.time_base }],
+      timeBase: audStr.time_base
+    }],
     outputParams: [{
       sampleRate: 1024,
       sampleFormat: 'fltp',
-      channelLayout: 'mono' }],
-    filterSpec: 'aresample=1024' });
-
-  const audFiltPkt = await audFilt.filter([{ frames: afrm }]);
+      channelLayout: 'mono'
+    }],
+    filterSpec: 'aresample=1024'
+  });
+  const audFiltPkt = await audFilt.filter([{ frames: afrm.frames }]);
   const encPkt = await audEnc.encode(audFiltPkt[0].frames[0]);
   console.log(encPkt);
-
-  let vstr = dm.streams[0]; // Select the video stream (assumes stream 0)
+  // find video stream
+  const streamVideoIdx = dm.streams.findIndex(stream => stream.codecpar.codec_type === 'video');
+  let vstr = dm.streams[streamVideoIdx]; // Select the video stream
   let filt = await beamcoder.filterer({ // Create a filterer for video
     filterType: 'video',
     inputParams: [{
@@ -81,21 +85,30 @@ app.use(async (ctx) => { // Assume HTTP GET with path /<file_name>/<time_in_s>
       height: vstr.codecpar.height,
       pixelFormat: vstr.codecpar.format,
       timeBase: vstr.time_base,
-      pixelAspect: vstr.sample_aspect_ratio }],
+      pixelAspect: vstr.sample_aspect_ratio
+    }],
     outputParams: [{ pixelFormat: 'yuv422p' }],
-    filterSpec: 'scale=640:360, colorspace=range=jpeg:all=bt709' });
-  let filtResult = await filt.filter([{ frames: decResult }]); // Filter the frame
+    filterSpec: 'scale=640:360, colorspace=range=jpeg:all=bt709'
+  });
+  let filtResult = await filt.filter([{ frames: decResult.frames }]); // Filter the frame
   let filtFrame = filtResult[0].frames[0];
   let enc = beamcoder.encoder({ // Create an encoder for JPEG data
-    name : 'mjpeg', // FFmpeg does not have an encoder called 'jpeg'
-    width : filtFrame.width,
+    name: 'mjpeg', // FFmpeg does not have an encoder called 'jpeg'
+    width: filtFrame.width,
     height: filtFrame.height,
     pix_fmt: 'yuvj422p',
-    time_base: [1, 1] });
+    time_base: [1, 1]
+  });
   let jpegResult = await enc.encode(filtFrame); // Encode the filtered frame
   await enc.flush(); // Tidy the encoder
   ctx.type = 'image/jpeg'; // Set the Content-Type of the data
   ctx.body = jpegResult.packets[0].data; // Return the JPEG image data
+} catch (err) {
+  ctx.status = err.statusCode || err.status || 500;
+  ctx.body = {
+    message: err.message
+  };
+}
 });
 
 app.listen(3000); // Start the server on port 3000
diff --git a/examples/make_mp4.js b/examples/make_mp4.ts
similarity index 94%
rename from examples/make_mp4.js
rename to examples/make_mp4.ts
index eaddbc9..c9bdffd 100644
--- a/examples/make_mp4.js
+++ b/examples/make_mp4.ts
@@ -26,8 +26,8 @@
   Output can be viewed in VLC. Make sure "All Files" is selected to see the file.
 */
 
-const beamcoder = require('../index.js'); // Use require('beamcoder') externally
-const fs = require('fs');
+import beamcoder from '..'; // Use require('beamcoder') externally
+import fs from 'fs';
 
 let endcode = Buffer.from([0, 0, 1, 0xb7]);
 
@@ -38,8 +38,8 @@ async function run() {
     width: 1920,
     height: 1080,
     bit_rate: 2000000,
-    time_base: [1, 25],
-    framerate: [25, 1],
+    time_base: [1, 25] as [number, number],
+    framerate: [25, 1] as [number, number],
     gop_size: 10,
     max_b_frames: 1,
     pix_fmt: 'yuv420p',
@@ -76,7 +76,7 @@ async function run() {
 
     let linesize = frame.linesize;
     let [ ydata, bdata, cdata ] = frame.data;
-    frame.pts = i+100;
+    frame.pts = i + 100;
 
     for ( let y = 0 ; y < frame.height ; y++ ) {
       for ( let x = 0 ; x < linesize[0] ; x++ ) {
diff --git a/examples/package.json b/examples/package.json
new file mode 100644
index 0000000..5709ee9
--- /dev/null
+++ b/examples/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "examples",
+  "version": "1.0.0",
+  "description": "",
+  "main": "jpeg_filter_app.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "koa": "^2.13.4"
+  },
+  "devDependencies": {
+    "@types/koa": "^2.13.4"
+  }
+}
diff --git a/examples/pnpm-lock.yaml b/examples/pnpm-lock.yaml
new file mode 100644
index 0000000..b7be1c2
--- /dev/null
+++ b/examples/pnpm-lock.yaml
@@ -0,0 +1,385 @@
+lockfileVersion: 5.3
+
+specifiers:
+  '@types/koa': ^2.13.4
+  koa: ^2.13.4
+
+dependencies:
+  koa: 2.13.4
+
+devDependencies:
+  '@types/koa': 2.13.4
+
+packages:
+
+  /@types/accepts/1.3.5:
+    resolution: {integrity: sha512-jOdnI/3qTpHABjM5cx1Hc0sKsPoYCp+DP/GJRGtDlPd7fiV9oXGGIcjW/ZOxLIvjGz8MA+uMZI9metHlgqbgwQ==}
+    dependencies:
+      '@types/node': 17.0.31
+    dev: true
+
+  /@types/body-parser/1.19.2:
+    resolution: {integrity: sha512-ALYone6pm6QmwZoAgeyNksccT9Q4AWZQ6PvfwR37GT6r6FWUPguq6sUmNGSMV2Wr761oQoBxwGGa6DR5o1DC9g==}
+    dependencies:
+      '@types/connect': 3.4.35
+      '@types/node': 17.0.31
+    dev: true
+
+  /@types/connect/3.4.35:
+    resolution: {integrity: sha512-cdeYyv4KWoEgpBISTxWvqYsVy444DOqehiF3fM3ne10AmJ62RSyNkUnxMJXHQWRQQX2eR94m5y1IZyDwBjV9FQ==}
+    dependencies:
+      '@types/node': 17.0.31
+    dev: true
+
+  /@types/content-disposition/0.5.4:
+    resolution: {integrity: sha512-0mPF08jn9zYI0n0Q/Pnz7C4kThdSt+6LD4amsrYDDpgBfrVWa3TcCOxKX1zkGgYniGagRv8heN2cbh+CAn+uuQ==}
+    dev: true
+
+  /@types/cookies/0.7.7:
+    resolution: {integrity: sha512-h7BcvPUogWbKCzBR2lY4oqaZbO3jXZksexYJVFvkrFeLgbZjQkU4x8pRq6eg2MHXQhY0McQdqmmsxRWlVAHooA==}
+    dependencies:
+      '@types/connect': 3.4.35
+      '@types/express': 4.17.13
+      '@types/keygrip': 1.0.2
+      '@types/node': 17.0.31
+    dev: true
+
+  /@types/express-serve-static-core/4.17.28:
+    resolution: {integrity: sha512-P1BJAEAW3E2DJUlkgq4tOL3RyMunoWXqbSCygWo5ZIWTjUgN1YnaXWW4VWl/oc8vs/XoYibEGBKP0uZyF4AHig==}
+    dependencies:
+      '@types/node': 17.0.31
+      '@types/qs': 6.9.7
+      '@types/range-parser': 1.2.4
+    dev: true
+
+  /@types/express/4.17.13:
+    resolution: {integrity: sha512-6bSZTPaTIACxn48l50SR+axgrqm6qXFIxrdAKaG6PaJk3+zuUr35hBlgT7vOmJcum+OEaIBLtHV/qloEAFITeA==}
+    dependencies:
+      '@types/body-parser': 1.19.2
+      '@types/express-serve-static-core': 4.17.28
+      '@types/qs': 6.9.7
+      '@types/serve-static': 1.13.10
+    dev: true
+
+  /@types/http-assert/1.5.3:
+    resolution: {integrity: sha512-FyAOrDuQmBi8/or3ns4rwPno7/9tJTijVW6aQQjK02+kOQ8zmoNg2XJtAuQhvQcy1ASJq38wirX5//9J1EqoUA==}
+    dev: true
+
+  /@types/http-errors/1.8.2:
+    resolution: {integrity: sha512-EqX+YQxINb+MeXaIqYDASb6U6FCHbWjkj4a1CKDBks3d/QiB2+PqBLyO72vLDgAO1wUI4O+9gweRcQK11bTL/w==}
+    dev: true
+
+  /@types/keygrip/1.0.2:
+    resolution: {integrity: sha512-GJhpTepz2udxGexqos8wgaBx4I/zWIDPh/KOGEwAqtuGDkOUJu5eFvwmdBX4AmB8Odsr+9pHCQqiAqDL/yKMKw==}
+    dev: true
+
+  /@types/koa-compose/3.2.5:
+    resolution: {integrity: sha512-B8nG/OoE1ORZqCkBVsup/AKcvjdgoHnfi4pZMn5UwAPCbhk/96xyv284eBYW8JlQbQ7zDmnpFr68I/40mFoIBQ==}
+    dependencies:
+      '@types/koa': 2.13.4
+    dev: true
+
+  /@types/koa/2.13.4:
+    resolution: {integrity: sha512-dfHYMfU+z/vKtQB7NUrthdAEiSvnLebvBjwHtfFmpZmB7em2N3WVQdHgnFq+xvyVgxW5jKDmjWfLD3lw4g4uTw==}
+    dependencies:
+      '@types/accepts': 1.3.5
+      '@types/content-disposition': 0.5.4
+      '@types/cookies': 0.7.7
+      '@types/http-assert': 1.5.3
+      '@types/http-errors': 1.8.2
+      '@types/keygrip': 1.0.2
+      '@types/koa-compose': 3.2.5
+      '@types/node': 17.0.31
+    dev: true
+
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+    resolution: {integrity: sha512-YATxVxgRqNH6nHEIsvg6k2Boc1JHI9ZbH5iWFFv/MTkchz3b1ieGDa5T0a9RznNdI0KhVbdbWSN+KWWrQZRxTw==}
+    dev: true
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+
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+
+  /mime-types/2.1.35:
+    resolution: {integrity: sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==}
+    engines: {node: '>= 0.6'}
+    dependencies:
+      mime-db: 1.52.0
+    dev: false
+
+  /ms/2.1.2:
+    resolution: {integrity: sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==}
+    dev: false
+
+  /negotiator/0.6.3:
+    resolution: {integrity: sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==}
+    engines: {node: '>= 0.6'}
+    dev: false
+
+  /on-finished/2.4.1:
+    resolution: {integrity: sha512-oVlzkg3ENAhCk2zdv7IJwd/QUD4z2RxRwpkcGY8psCVcCYZNq4wYnVWALHM+brtuJjePWiYF/ClmuDr8Ch5+kg==}
+    engines: {node: '>= 0.8'}
+    dependencies:
+      ee-first: 1.1.1
+    dev: false
+
+  /only/0.0.2:
+    resolution: {integrity: sha1-Kv3oTQPlC5qO3EROMGEKcCle37Q=}
+    dev: false
+
+  /parseurl/1.3.3:
+    resolution: {integrity: sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==}
+    engines: {node: '>= 0.8'}
+    dev: false
+
+  /safe-buffer/5.2.1:
+    resolution: {integrity: sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==}
+    dev: false
+
+  /setprototypeof/1.2.0:
+    resolution: {integrity: sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==}
+    dev: false
+
+  /statuses/1.5.0:
+    resolution: {integrity: sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=}
+    engines: {node: '>= 0.6'}
+    dev: false
+
+  /toidentifier/1.0.1:
+    resolution: {integrity: sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==}
+    engines: {node: '>=0.6'}
+    dev: false
+
+  /tsscmp/1.0.6:
+    resolution: {integrity: sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA==}
+    engines: {node: '>=0.6.x'}
+    dev: false
+
+  /type-is/1.6.18:
+    resolution: {integrity: sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==}
+    engines: {node: '>= 0.6'}
+    dependencies:
+      media-typer: 0.3.0
+      mime-types: 2.1.35
+    dev: false
+
+  /vary/1.1.2:
+    resolution: {integrity: sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=}
+    engines: {node: '>= 0.8'}
+    dev: false
+
+  /ylru/1.3.2:
+    resolution: {integrity: sha512-RXRJzMiK6U2ye0BlGGZnmpwJDPgakn6aNQ0A7gHRbD4I0uvK4TW6UqkK1V0pp9jskjJBAXd3dRrbzWkqJ+6cxA==}
+    engines: {node: '>= 4.0.0'}
+    dev: false
diff --git a/examples/streamTest.ts b/examples/streamTest.ts
new file mode 100644
index 0000000..b052122
--- /dev/null
+++ b/examples/streamTest.ts
@@ -0,0 +1,83 @@
+import beamcoder, { DemuxerStream } from '..'; // Use require('beamcoder') externally
+import path from 'path';
+import fs from 'fs';
+import { Demuxer, getRaw } from '..';
+import md5File from 'md5-file';
+
+const streamUrl = 'https://github.com/awslabs/amazon-kinesis-video-streams-producer-c/raw/master/samples/h264SampleFrames/';
+async function getFiles(): Promise<string[]> {
+    const src = path.join(__dirname, 'capture', 'h264SampleFrames');
+    if (!fs.existsSync(src)) {
+        fs.mkdirSync(src, { recursive: true });
+    }
+    let filelist = (await fs.promises.readdir(src)).filter(f => f.endsWith('.h264'));
+    const toto: Promise<void>[] = [];
+    if (filelist.length < 403) {
+        for (let i = 1; i < 404; i++) {
+            const fn = `frame-${i.toFixed().padStart(3, '0')}.h264`;
+            const url = `${streamUrl}${fn}`;
+            const dest = path.join(src, fn)
+            if (!fs.existsSync(dest)) {
+                let ws = fs.createWriteStream(dest);
+                toto.push(getRaw(ws, url).catch(async (err) => {
+                    if (err.name === 'RedirectError') {
+                        const redirectURL = err.message;
+                        await getRaw(ws, redirectURL, fn);
+                    } else throw err;
+                }))
+            }
+        }
+        await Promise.all(toto);
+        filelist = (await fs.promises.readdir(src)).filter(f => f.endsWith('.h264'));
+    }
+    filelist.sort();
+    return filelist.map(f => path.join(src, f));
+}
+
+async function run() {
+    const filelist = await getFiles();
+    const stream = new DemuxerStream({ highwaterMark: 3600 });
+    const demuxPromise = stream.demuxer({})
+    demuxPromise.then(async (demuxer: Demuxer) => {
+        let dec = beamcoder.decoder({ demuxer, stream_index: 0 }); // Create a decoder
+        let frameId = 0;
+        while (true) {
+            const packet = await demuxer.read();
+            let decResult = await dec.decode(packet); // Decode the frame
+            if (decResult.frames.length === 0) // Frame may be buffered, so flush it out
+                decResult = await dec.flush();
+            // Filtering could be used to transform the picture here, e.g. scaling
+            let enc = beamcoder.encoder({ // Create an encoder for JPEG data
+                name: 'mjpeg', // FFmpeg does not have an encoder called 'jpeg'
+                width: dec.width,
+                height: dec.height,
+                pix_fmt: dec.pix_fmt.indexOf('422') >= 0 ? 'yuvj422p' : 'yuvj420p',
+                time_base: [1, 1]
+            });
+            let jpegResult = await enc.encode(decResult.frames[0]); // Encode the frame
+            await enc.flush(); // Tidy the encoder
+            frameId++;
+            const jpgDest = `capture${frameId % 10}.jpg`;
+            // if (frameId % 10 === 1)
+            fs.writeFileSync(jpgDest, jpegResult.packets[0].data);
+            const sumDest = await md5File(jpgDest);
+            if (frameId === 1) {
+                const expectedMd5Mac = '63a5031f882ad85a964441f61333240c';
+                const expectedMd5PC = 'e16f49626e71b4be46a3211ed1d4e471';
+                if (expectedMd5Mac !== sumDest && expectedMd5PC !== sumDest) {
+                    console.error(`MD5 missmatch get ${sumDest}`)
+                }
+            }
+            console.log(`saving in stream img as ${jpgDest} pos: ${packet.pos} md5: ${sumDest}`);
+        }
+        demuxer.forceClose();
+    });
+    // https://github.com/awslabs/amazon-kinesis-video-streams-producer-c/raw/master/samples/h264SampleFrames/frame-001.h264
+    for (const fullname of filelist) {
+        const buf = await fs.promises.readFile(fullname);
+        stream.write(buf);
+    }
+    stream.emit('finish');
+}
+
+run().catch(e => console.error(e));
diff --git a/index.js b/index.js
deleted file mode 100644
index c9ee041..0000000
--- a/index.js
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
-  Aerostat Beam Coder - Node.js native bindings to FFmpeg
-  Copyright (C) 2019 Streampunk Media Ltd.
-
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-  https://www.streampunk.media/ mailto:furnace@streampunk.media
-  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
-*/
-
-const beamcoder = require('bindings')('beamcoder');
-const beamstreams = require('./beamstreams.js');
-
-// Provide useful debug on segfault-related crash
-const SegfaultHandler = require('segfault-handler');
-SegfaultHandler.registerHandler('crash.log');
-
-const splash = `Aerostat Beam Coder  Copyright (C) 2019  Streampunk Media Ltd
-GPL v3.0 or later license. This program comes with ABSOLUTELY NO WARRANTY.
-This is free software, and you are welcome to redistribute it
-under certain conditions. Conditions and warranty at:
-https://github.com/Streampunk/beamcoder/blob/master/LICENSE`;
-
-console.log(splash);
-console.log('Using FFmpeg version', beamcoder.avVersionInfo());
-
-beamcoder.demuxerStream = beamstreams.demuxerStream;
-beamcoder.muxerStream = beamstreams.muxerStream;
-
-beamcoder.makeSources = beamstreams.makeSources;
-beamcoder.makeStreams = beamstreams.makeStreams;
-
-module.exports = beamcoder;
diff --git a/install_ffmpeg.js b/install_ffmpeg.js
deleted file mode 100644
index 6e375c9..0000000
--- a/install_ffmpeg.js
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
-  Aerostat Beam Coder - Node.js native bindings to FFmpeg.
-  Copyright (C) 2019  Streampunk Media Ltd.
-
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-  https://www.streampunk.media/ mailto:furnace@streampunk.media
-  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
-*/
-
-const os = require('os');
-const fs = require('fs');
-const util = require('util');
-const https = require('https');
-const cp = require('child_process');
-const [ mkdir, access, rename, execFile, exec ] = // eslint-disable-line
-  [ fs.mkdir, fs.access, fs.rename, cp.execFile, cp.exec ].map(util.promisify);
-
-async function get(ws, url, name) {
-  let received = 0;
-  let totalLength = 0;
-  return new Promise((comp, err) => {
-    https.get(url, res => {
-      if (res.statusCode === 301 || res.statusCode === 302) {
-        err({ name: 'RedirectError', message: res.headers.location });
-      } else {
-        res.pipe(ws);
-        if (totalLength == 0) {
-          totalLength = +res.headers['content-length'];
-        }
-        res.on('end', () => {
-          process.stdout.write(`Downloaded 100% of '${name}'. Total length ${received} bytes.\n`);
-          comp();
-        });
-        res.on('error', err);
-        res.on('data', x => {
-          received += x.length;
-          process.stdout.write(`Downloaded ${received * 100/ totalLength | 0 }% of '${name}'.\r`);
-        });
-      }
-    }).on('error', err);
-  });
-}
-
-async function getHTML(url, name) {
-  let received = 0;
-  let totalLength = 0;
-  return new Promise((resolve, reject) => {
-    https.get(url, res => {
-      const chunks = [];
-      if (totalLength == 0) {
-        totalLength = +res.headers['content-length'];
-      }
-      res.on('end', () => {
-        process.stdout.write(`Downloaded 100% of '${name}'. Total length ${received} bytes.\n`);
-        resolve(Buffer.concat(chunks));
-      });
-      res.on('error', reject);
-      res.on('data', (chunk) => {
-        chunks.push(chunk);
-        received += chunk.length;
-        process.stdout.write(`Downloaded ${received * 100/ totalLength | 0 }% of '${name}'.\r`);
-      });
-    }).on('error', reject);
-  });
-}
-
-async function inflate(rs, folder, name) {
-  const unzip = require('unzipper');
-  const directory = await unzip.Open.file(`${folder}/${name}.zip`);
-  const directoryName = directory.files[0].path;
-  return new Promise((comp, err) => {
-    console.log(`Unzipping '${folder}/${name}.zip'.`);
-    rs.pipe(unzip.Extract({ path: folder }).on('close', () => {
-      fs.rename(`./${folder}/${directoryName}`, `./${folder}/${name}`, () => {
-        console.log(`Unzipping of '${folder}/${name}.zip' completed.`);
-        comp();
-      });
-    }));
-    rs.on('error', err);
-  });
-}
-
-async function win32() {
-  console.log('Checking/Installing FFmpeg dependencies for Beam Coder on Windows.');
-
-  await mkdir('ffmpeg').catch(e => {
-    if (e.code === 'EEXIST') return;
-    else throw e;
-  });
-  
-  const ffmpegFilename = 'ffmpeg-5.x-win64-shared';
-  await access(`ffmpeg/${ffmpegFilename}`, fs.constants.R_OK).catch(async () => {
-    const html = await getHTML('https://github.com/BtbN/FFmpeg-Builds/wiki/Latest', 'latest autobuilds');
-    const htmlStr = html.toString('utf-8');
-    const autoPos = htmlStr.indexOf('<p><a href=');
-    const endPos = htmlStr.indexOf('</div>', autoPos);
-    const autoStr = htmlStr.substring(autoPos, endPos);
-    const sharedEndPos = autoStr.lastIndexOf('">win64-gpl-shared-5.');
-    if (sharedEndPos === -1)
-      throw new Error('Failed to find latest v4.x autobuild from "https://github.com/BtbN/FFmpeg-Builds/wiki/Latest"');
-    const startStr = '<p><a href="';
-    const sharedStartPos = autoStr.lastIndexOf(startStr, sharedEndPos) + startStr.length;
-    const downloadSource = autoStr.substring(sharedStartPos, sharedEndPos);
-
-    let ws_shared = fs.createWriteStream(`ffmpeg/${ffmpegFilename}.zip`);
-    await get(ws_shared, downloadSource, `${ffmpegFilename}.zip`)
-      .catch(async (err) => {
-        if (err.name === 'RedirectError') {
-          const redirectURL = err.message;
-          await get(ws_shared, redirectURL, `${ffmpegFilename}.zip`);
-        } else console.error(err);
-      });
-
-    await exec('npm install unzipper --no-save');
-    let rs_shared = fs.createReadStream(`ffmpeg/${ffmpegFilename}.zip`);
-    await inflate(rs_shared, 'ffmpeg', `${ffmpegFilename}`);
-  });
-}
-
-async function linux() {
-  console.log('Checking FFmpeg dependencies for Beam Coder on Linux.');
-  const { stdout } = await execFile('ldconfig', ['-p']).catch(console.error);
-  let result = 0;
-
-  if (stdout.indexOf('libavcodec.so.59') < 0) {
-    console.error('libavcodec.so.59 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libavformat.so.59') < 0) {
-    console.error('libavformat.so.59 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libavdevice.so.59') < 0) {
-    console.error('libavdevice.so.59 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libavfilter.so.8') < 0) {
-    console.error('libavfilter.so.8 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libavutil.so.57') < 0) {
-    console.error('libavutil.so.57 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libpostproc.so.56') < 0) {
-    console.error('libpostproc.so.56 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libswresample.so.4') < 0) {
-    console.error('libswresample.so.4 is not installed.');
-    result = 1;
-  }
-  if (stdout.indexOf('libswscale.so.6') < 0) {
-    console.error('libswscale.so.6 is not installed.');
-    result = 1;
-  }
-
-  if (result === 1) {
-    console.log(`Try running the following (Ubuntu/Debian):
-sudo add-apt-repository ppa:jonathonf/ffmpeg-4
-sudo apt-get install libavcodec-dev libavformat-dev libavdevice-dev libavfilter-dev libavutil-dev libpostproc-dev libswresample-dev libswscale-dev`);
-    process.exit(1);
-  }
-  return result;
-}
-
-async function darwin() {
-  console.log('Checking for FFmpeg dependencies via HomeBrew.');
-  let output;
-  let returnMessage;
-  
-  try {
-    output = await exec('brew list ffmpeg');
-    returnMessage = 'FFmpeg already present via Homebrew.';
-  } catch (err) {
-    if (err.stderr !== 'Error: No such keg: /usr/local/Cellar/ffmpeg\n') {
-      console.error(err);
-      console.log('Either Homebrew is not installed or something else is wrong.\nExiting');
-      process.exit(1);
-    }
-
-    console.log('FFmpeg not installed. Attempting to install via Homebrew.');
-    try {
-      output = await exec('brew install nasm pkg-config texi2html ffmpeg');
-      returnMessage = 'FFmpeg installed via Homebrew.';
-    } catch (err) {
-      console.log('Failed to install ffmpeg:\n');
-      console.error(err);
-      process.exit(1);
-    }
-  }
-
-  console.log(output.stdout);
-  console.log(returnMessage);
-
-  return 0;
-}
-
-switch (os.platform()) {
-case 'win32':
-  if (os.arch() != 'x64') {
-    console.error('Only 64-bit platforms are supported.');
-    process.exit(1);
-  } else {
-    win32().catch(console.error);
-  }
-  break;
-case 'linux':
-  if (os.arch() != 'x64' && os.arch() != 'arm64') {
-    console.error('Only 64-bit platforms are supported.');
-    process.exit(1);
-  } else {
-    linux();
-  }
-  break;
-case 'darwin':
-  if (os.arch() != 'x64' && os.arch() != 'arm64') {
-    console.error('Only 64-bit platforms are supported.');
-    process.exit(1);
-  } else {
-    darwin();
-  }
-  break;
-default:
-  console.error(`Platfrom ${os.platform()} is not supported.`);
-  break;
-}
diff --git a/package-lock.json b/package-lock.json
index 1f8e9ed..a7ca2e8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,14 +14,42 @@
         "segfault-handler": "^1.3.0"
       },
       "devDependencies": {
-        "eslint": "^8.9.0",
-        "tape": "^5.5.2"
+        "@types/bindings": "^1.5.1",
+        "@types/node": "^17.0.31",
+        "@types/tape": "^4.13.2",
+        "eslint": "^8.14.0",
+        "md5-file": "^5.0.0",
+        "rimraf": "^3.0.2",
+        "tape": "^5.5.3",
+        "ts-node": "^10.7.0",
+        "typescript": "^4.6.4"
+      }
+    },
+    "node_modules/@cspotcode/source-map-consumer": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-consumer/-/source-map-consumer-0.8.0.tgz",
+      "integrity": "sha512-41qniHzTU8yAGbCp04ohlmSrZf8bkf/iJsl3V0dRGsQN/5GFfx+LbCSsCpp2gqrqjTVg/K6O8ycoV35JIwAzAg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 12"
+      }
+    },
+    "node_modules/@cspotcode/source-map-support": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.7.0.tgz",
+      "integrity": "sha512-X4xqRHqN8ACt2aHVe51OxeA2HjbcL4MqFqXkrmQszJ1NOUuUu5u6Vqx/0lZSVNku7velL5FC/s5uEAj1lsBMhA==",
+      "dev": true,
+      "dependencies": {
+        "@cspotcode/source-map-consumer": "0.8.0"
+      },
+      "engines": {
+        "node": ">=12"
       }
     },
     "node_modules/@eslint/eslintrc": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-1.2.1.tgz",
-      "integrity": "sha512-bxvbYnBPN1Gibwyp6NrpnFzA3YtRL3BBAyEAFVIpNTm2Rn4Vy87GA5M4aSn3InRrlsbX5N0GW7XIx+U4SAEKdQ==",
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-1.2.2.tgz",
+      "integrity": "sha512-lTVWHs7O2hjBFZunXTZYnYqtB9GakA1lnxIf+gKq2nY5gxkkNi/lQvveW6t8gFdOHTg6nG50Xs95PrLqVpcaLg==",
       "dev": true,
       "dependencies": {
         "ajv": "^6.12.4",
@@ -58,10 +86,58 @@
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
+    "node_modules/@tsconfig/node10": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node10/-/node10-1.0.8.tgz",
+      "integrity": "sha512-6XFfSQmMgq0CFLY1MslA/CPUfhIL919M1rMsa5lP2P097N2Wd1sSX0tx1u4olM16fLNhtHZpRhedZJphNJqmZg==",
+      "dev": true
+    },
+    "node_modules/@tsconfig/node12": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node12/-/node12-1.0.9.tgz",
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@@ -1983,6 +2259,12 @@
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+      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.2.tgz",
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+      "dev": true
+    },
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       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
@@ -2063,12 +2345,12 @@
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+      "version": "8.14.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.14.0.tgz",
+      "integrity": "sha512-3/CE4aJX7LNEiE3i6FeodHmI/38GZtWCsAtsymScmzYapx8q1nVVb+eLcLSzATmCPXw5pT4TqVs1E0OmxAd9tw==",
       "dev": true,
       "requires": {
-        "@eslint/eslintrc": "^1.2.1",
+        "@eslint/eslintrc": "^1.2.2",
         "@humanwhocodes/config-array": "^0.9.2",
         "ajv": "^6.10.0",
         "chalk": "^4.0.0",
@@ -2630,6 +2912,18 @@
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       "dev": true
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+    "make-error": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
+      "integrity": "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==",
+      "dev": true
+    },
+    "md5-file": {
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+      "resolved": "https://registry.npmjs.org/md5-file/-/md5-file-5.0.0.tgz",
+      "integrity": "sha512-xbEFXCYVWrSx/gEKS1VPlg84h/4L20znVIulKw6kMfmBUAZNAnF00eczz9ICMl+/hjQGo5KSXRxbL/47X3rmMw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
@@ -2899,9 +3193,9 @@
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-      "resolved": "https://registry.npmjs.org/tape/-/tape-5.5.2.tgz",
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+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/tape/-/tape-5.5.3.tgz",
+      "integrity": "sha512-hPBJZBL9S7bH9vECg/KSM24slGYV589jJr4dmtiJrLD71AL66+8o4b9HdZazXZyvnilqA7eE8z5/flKiy0KsBg==",
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@@ -2916,7 +3210,7 @@
         "has-dynamic-import": "^2.0.1",
         "inherits": "^2.0.4",
         "is-regex": "^1.1.4",
-        "minimist": "^1.2.5",
+        "minimist": "^1.2.6",
         "object-inspect": "^1.12.0",
         "object-is": "^1.1.5",
         "object-keys": "^1.1.1",
@@ -2939,6 +3233,27 @@
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       "dev": true
     },
+    "ts-node": {
+      "version": "10.7.0",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.7.0.tgz",
+      "integrity": "sha512-TbIGS4xgJoX2i3do417KSaep1uRAW/Lu+WAL2doDHC0D6ummjirVOXU5/7aiZotbQ5p1Zp9tP7U6cYhA0O7M8A==",
+      "dev": true,
+      "requires": {
+        "@cspotcode/source-map-support": "0.7.0",
+        "@tsconfig/node10": "^1.0.7",
+        "@tsconfig/node12": "^1.0.7",
+        "@tsconfig/node14": "^1.0.0",
+        "@tsconfig/node16": "^1.0.2",
+        "acorn": "^8.4.1",
+        "acorn-walk": "^8.1.1",
+        "arg": "^4.1.0",
+        "create-require": "^1.1.0",
+        "diff": "^4.0.1",
+        "make-error": "^1.1.1",
+        "v8-compile-cache-lib": "^3.0.0",
+        "yn": "3.1.1"
+      }
+    },
     "type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -2954,6 +3269,12 @@
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       "dev": true
     },
+    "typescript": {
+      "version": "4.6.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.6.4.tgz",
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+      "dev": true
+    },
     "unbox-primitive": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.1.tgz",
@@ -2981,6 +3302,12 @@
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       "dev": true
     },
+    "v8-compile-cache-lib": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
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+      "dev": true
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -3040,6 +3367,12 @@
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       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
+    },
+    "yn": {
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+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 483f547..c5f52d1 100644
--- a/package.json
+++ b/package.json
@@ -1,17 +1,25 @@
 {
-  "name": "beamcoder",
-  "version": "0.7.1",
-  "description": "Node.js native bindings to FFmpeg.",
-  "main": "index.js",
-  "types": "index.d.ts",
+  "name": "@u4/beamcoder",
+  "version": "0.7.4",
+  "description": "Node.js native bindings to FFmpeg in Typescript",
+  "main": "ts/index.js",
+  "types": "ts/index.d.ts",
   "scripts": {
-    "preinstall": "node install_ffmpeg.js",
+    "prepack": "tsc -p .",
+    "preinstall": "node ts/install_ffmpeg.js",
     "install": "node-gyp rebuild",
-    "test": "tape test/*.js",
+    "build": "tsc -p .",
+    "clean": "rimraf ts/*.js ts/*.d.ts temp.mp4",
+    "test": "ts-node node_modules/tape/bin/tape test/*.ts",
+    "retest": "npm run clean && npm run build && npm run test",
     "lint": "eslint **/*.js",
     "lint-html": "eslint **/*.js -f html -o ./reports/lint-results.html",
     "lint-fix": "eslint --fix **/*.js"
   },
+  "contributors": [
+    "Streampunk Media Ltd (https://www.streampunk.media/)",
+    "Uriel Chemouni <uchemouni@gmail.com> (https://urielch.github.io/)"
+  ],
   "repository": {
     "type": "git",
     "url": "git+https://github.com/Streampunk/beamcoder.git"
@@ -30,16 +38,32 @@
   "author": "Streampunk Media Ltd",
   "license": "GPL-3.0-or-later",
   "bugs": {
-    "url": "https://github.com/Streampunk/beamcoder/issues"
+    "url": "https://github.com/UrielCh/beamcoder/issues"
   },
-  "homepage": "https://github.com/Streampunk/beamcoder#readme",
+  "homepage": "https://github.com/UrielCh/beamcoder#readme",
   "dependencies": {
     "bindings": "^1.5.0",
-    "segfault-handler": "^1.3.0"
+    "segfault-handler": "^1.3.0",
+    "unzipper": "^0.10.11"
   },
   "devDependencies": {
-    "eslint": "^8.9.0",
-    "tape": "^5.5.2"
+    "@types/bindings": "^1.5.1",
+    "@types/node": "^17.0.31",
+    "@types/tape": "^4.13.2",
+    "@types/unzipper": "^0.10.5",
+    "@types/webtorrent": "^0.109.3",
+    "eslint": "^8.14.0",
+    "md5-file": "^5.0.0",
+    "rimraf": "^3.0.2",
+    "tape": "^5.5.3",
+    "ts-node": "^10.7.0",
+    "typescript": "^4.6.4",
+    "webtorrent": "^1.8.16"
   },
-  "gypfile": true
+  "gypfile": true,
+  "files": [
+    "src",
+    "ts",
+    "binding.gyp"
+  ]
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
new file mode 100644
index 0000000..9394453
--- /dev/null
+++ b/pnpm-lock.yaml
@@ -0,0 +1,2257 @@
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+
+specifiers:
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+  '@types/node': ^17.0.31
+  '@types/tape': ^4.13.2
+  '@types/unzipper': ^0.10.5
+  '@types/webtorrent': ^0.109.3
+  bindings: ^1.5.0
+  eslint: ^8.14.0
+  md5-file: ^5.0.0
+  rimraf: ^3.0.2
+  segfault-handler: ^1.3.0
+  tape: ^5.5.3
+  ts-node: ^10.7.0
+  typescript: ^4.6.4
+  unzipper: ^0.10.11
+  webtorrent: ^1.8.16
+
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+  segfault-handler: 1.3.0
+  unzipper: 0.10.11
+
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+  '@types/node': 17.0.31
+  '@types/tape': 4.13.2
+  '@types/unzipper': 0.10.5
+  '@types/webtorrent': 0.109.3
+  eslint: 8.14.0
+  md5-file: 5.0.0
+  rimraf: 3.0.2
+  tape: 5.5.3
+  ts-node: 10.7.0_5f3e12794cebfbf3197131903b74d233
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+  webtorrent: 1.8.16
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+    dev: true
+
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+        optional: true
+    dependencies:
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+      utf-8-validate: 5.0.9
+    dev: true
+
+  /yn/3.1.1:
+    resolution: {integrity: sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==}
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+    dev: true
diff --git a/scratch/decode_aac.js b/scratch/decode_aac.ts
similarity index 91%
rename from scratch/decode_aac.js
rename to scratch/decode_aac.ts
index 2264f3a..3918524 100644
--- a/scratch/decode_aac.js
+++ b/scratch/decode_aac.ts
@@ -19,15 +19,15 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder, { Packet } from '..';
 
 async function run() {
   let demuxer = await beamcoder.demuxer({ url: '../media/bbb_1080p_c.ts'});
   let decoder = beamcoder.decoder({ name: 'aac' });
-  let packet = {};
+  let packet: Packet = {} as Packet;
   for ( let x = 0 ; packet !== null && x < 100 ; x++ ) {
     packet = await demuxer.read();
-    if (packet.stream_index == 1) {
+    if (packet.stream_index === 1) {
       console.log(JSON.stringify(packet, null, 2));
       let frames = await decoder.decode(packet);
       console.log(JSON.stringify(frames.frames[0], null, 2));
diff --git a/scratch/decode_avci.js b/scratch/decode_avci.ts
similarity index 93%
rename from scratch/decode_avci.js
rename to scratch/decode_avci.ts
index 1a6365b..21625aa 100644
--- a/scratch/decode_avci.js
+++ b/scratch/decode_avci.ts
@@ -19,7 +19,7 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder, { Packet } from '..';
 
 async function run() {
   // let demuxer = await beamcoder.demuxer('../media/dpp/AS11_DPP_HD_EXAMPLE_1.mxf');
@@ -30,7 +30,7 @@ async function run() {
   // let decoder = beamcoder.decoder({ name: 'h264', thread_count: 4, thread_type: { FRAME: false, SLICE: true } });
   let decoder = beamcoder.decoder({ name: 'h264', thread_count: 1, hwaccel: true });
   // console.dir(decoder, { getters: true, depth: 3 });
-  let packet = {};
+  let packet: Packet = {} as Packet;
   for ( let x = 0 ; x < 2000 && packet != null; x++ ) {
     packet = await demuxer.read();
     if (packet && packet.stream_index === 0) {
@@ -44,7 +44,7 @@ async function run() {
     }
   }
   let frames = await decoder.flush();
-  console.log('flush', frames.total_time, frames.length);
+  console.log('flush', frames.total_time, frames.frames.length);
 }
 
 run();
diff --git a/scratch/decode_hevc.js b/scratch/decode_hevc.ts
similarity index 96%
rename from scratch/decode_hevc.js
rename to scratch/decode_hevc.ts
index f58b768..6e5df94 100644
--- a/scratch/decode_hevc.js
+++ b/scratch/decode_hevc.ts
@@ -19,7 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+
+import beamcoder from '..';
 
 async function run() {
   let demuxer = await beamcoder.demuxer('../media/bbb_1080p_c.ts');
diff --git a/scratch/decode_pcm.js b/scratch/decode_pcm.ts
similarity index 73%
rename from scratch/decode_pcm.js
rename to scratch/decode_pcm.ts
index 5be1d2e..6dc51ee 100644
--- a/scratch/decode_pcm.js
+++ b/scratch/decode_pcm.ts
@@ -19,19 +19,22 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder from '..';
 
 async function run() {
   let demuxer = await beamcoder.demuxer('../media/dpp/AS11_DPP_HD_EXAMPLE_1.mxf');
-  console.log(demuxer.streams[1]);
+  console.log('streams cnt:', demuxer.streams.length);
   let decoder = await beamcoder.decoder({ demuxer: demuxer, stream_index : 1 });
-  console.log(decoder);
+  console.log('decoder type:', decoder.type);
   for ( let x = 0 ; x < 100 ; x++ ) {
     let packet = await demuxer.read();
-    if (packet.stream == 1) {
+    if (packet.stream_index == 1) {
       //console.log(packet);
       let frames = await decoder.decode(packet);
-      console.log(frames.frames);
+      console.log(`i: ${x} total framews: ${frames.frames.length}`);
+      console.log(`nb Channels: ${frames.frames[0].channels}`);
+      console.log(`channel_layout: ${frames.frames[0].channel_layout}`);
+      console.log(`sample_rate: ${frames.frames[0].sample_rate}`);
     }
   }
 }
diff --git a/scratch/make_a_mux.js b/scratch/make_a_mux.ts
similarity index 96%
rename from scratch/make_a_mux.js
rename to scratch/make_a_mux.ts
index b9f42d8..599b7d9 100644
--- a/scratch/make_a_mux.js
+++ b/scratch/make_a_mux.ts
@@ -19,7 +19,7 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder, { Packet } from '..';
 
 async function run() {
   let demuxer = await beamcoder.demuxer('../media/sound/BBCNewsCountdown.wav');
@@ -57,7 +57,7 @@ async function run() {
   // stream.codecpar = demuxer.streams[0].codecpar;
   await muxer.openIO({ options: { blocksize: 8192 }}).then(console.log);
   await muxer.writeHeader({ options: { write_bext: true, write_peak: 'on', peak_format: 2 }}).then(console.log);
-  let packet = {};
+  let packet = {} as Packet;
   for ( let x = 0 ; x < 100 && packet !== null ; x++ ) {
     packet = await demuxer.read();
     await muxer.writeFrame(packet);
diff --git a/scratch/muxer.js b/scratch/muxer.ts
similarity index 79%
rename from scratch/muxer.js
rename to scratch/muxer.ts
index 8883697..284db90 100644
--- a/scratch/muxer.js
+++ b/scratch/muxer.ts
@@ -21,11 +21,11 @@
 
 // Work in progress
 
-const beamcoder = require('../index.js');
+import beamcoder from '..';
 
 const STREAM_FRAME_RATE = 25;
 
-function allocAudioFrame(sampleFormat, channelLayout, sampleRate, nbSamples) {
+function allocAudioFrame(sampleFormat: string, channelLayout: 'stereo' | 'mono', sampleRate: number, nbSamples: number) {
 
   return beamcoder.frame({
     format: sampleFormat,
@@ -35,7 +35,7 @@ function allocAudioFrame(sampleFormat, channelLayout, sampleRate, nbSamples) {
   }).alloc();
 }
 
-function allocPicture(pixelFmt, width, height) { // eslint-disable-line
+function allocPicture(pixelFmt: string, width: number, height: number) { // eslint-disable-line
 
   return beamcoder.frame({
     format: pixelFmt,
@@ -44,13 +44,15 @@ function allocPicture(pixelFmt, width, height) { // eslint-disable-line
   }).alloc();
 }
 
-async function addStream(stream, muxer, codecID) { // eslint-disable-line
-  let codec = await beamcoder.encoder({ codec_id: codecID });
+async function addStream(stream, muxer, codecID: number) { // eslint-disable-line
+  let codec = beamcoder.encoder({ codec_id: codecID });
 
   stream.st = muxer.newStream();
   stream.enc = codec;
+  // @ts-ignore
   switch (codec.media_type) {
   case 'video':
+  // @ts-ignore
     codec.setParameters({
       codec_id: codecID,
       bit_rate: 400000,
diff --git a/scratch/read_wav.js b/scratch/read_wav.ts
similarity index 87%
rename from scratch/read_wav.js
rename to scratch/read_wav.ts
index 965bfdc..d85876b 100644
--- a/scratch/read_wav.js
+++ b/scratch/read_wav.ts
@@ -19,14 +19,14 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder from '..';
 
 async function run() {
-  let demuxer = await beamcoder.demuxer('../media/sound/BBCNewsCountdown.wav');
+  let demuxer = await beamcoder.demuxer('../../media/sound/BBCNewsCountdown.wav');
   let packet = {};
   for ( let x = 0 ; x < 100 && packet !== null ; x++ ) {
     packet = await demuxer.read();
-    console.log(x, packet);
+    console.log(x, JSON.stringify(packet));
   }
   console.log(await demuxer.seek({ frame : 120 }));
   console.log(await demuxer.read());
diff --git a/scratch/simple_mux.js b/scratch/simple_mux.ts
similarity index 95%
rename from scratch/simple_mux.js
rename to scratch/simple_mux.ts
index 3d3762f..a6ce12e 100644
--- a/scratch/simple_mux.js
+++ b/scratch/simple_mux.ts
@@ -18,7 +18,7 @@
   https://www.streampunk.media/ mailto:furnace@streampunk.media
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
-const beamcoder = require('../index.js');
+import beamcoder, { Packet } from '..';
 
 async function run() {
   let demuxer = await beamcoder.demuxer('../media/sound/BBCNewsCountdown.wav');
@@ -28,7 +28,7 @@ async function run() {
   // stream.codecpar = demuxer.streams[0].codecpar;
   await muxer.openIO();
   await muxer.writeHeader();
-  let packet = {};
+  let packet = {} as Packet;
   for ( let x = 0 ; x < 100 && packet !== null ; x++ ) {
     packet = await demuxer.read();
     await muxer.writeFrame(packet);
diff --git a/scratch/stream_avci.js b/scratch/stream_avci.ts
similarity index 90%
rename from scratch/stream_avci.js
rename to scratch/stream_avci.ts
index 622f6f4..760f877 100644
--- a/scratch/stream_avci.js
+++ b/scratch/stream_avci.ts
@@ -19,18 +19,18 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
-const fs = require('fs');
+import beamcoder, { DemuxerStream, Packet } from '..';
+import fs from 'fs';
 // const util = require('util');
 
 async function run() {
   // let demuxer = await createDemuxer('../../media/dpp/AS11_DPP_HD_EXAMPLE_1.mxf');
-  let demuxerStream = beamcoder.demuxerStream({ highwaterMark: 65536 });
+  // http://ftp.kw.bbc.co.uk/dppdownload/dpp_example_files/AS11_DPP_HD_EXAMPLE_1.mxf
+  let demuxerStream = new DemuxerStream({ highwaterMark: 65536 });
   fs.createReadStream('../../media/dpp/AS11_DPP_HD_EXAMPLE_1.mxf').pipe(demuxerStream);
   let demuxer = await demuxerStream.demuxer({});
   // console.log(demuxer);
-
-  let decoder = await beamcoder.decoder({ name: 'h264' });
+  let decoder = beamcoder.decoder({ name: 'h264' });
   // console.log(decoder);
 
   const vidStream = demuxer.streams[0];
@@ -80,8 +80,8 @@ async function run() {
     width: 1280,
     height: 720,
     // bit_rate: 10000000,
-    time_base: [1, 25],
-    framerate: [25, 1],
+    time_base: [1, 25] as [number, number],
+    framerate: [25, 1] as [number, number],
     // gop_size: 50,
     // max_b_frames: 1,
     pix_fmt: 'yuv422p',
@@ -100,7 +100,7 @@ async function run() {
 
   // await demuxer.seek({ frame: 4200, stream_index: 0});
 
-  let packet = {};
+  let packet = {} as Packet;
   for ( let x = 0 ; x < 10 && packet !== null; x++ ) {
     packet = await demuxer.read();
     if (packet.stream_index == 0) {
@@ -120,7 +120,7 @@ async function run() {
   }
   let frames = await decoder.flush();
   console.log('flush', frames.total_time, frames.frames.length);
-
+  
   demuxerStream.destroy();
 }
 
diff --git a/scratch/stream_mp4.js b/scratch/stream_mp4.ts
similarity index 50%
rename from scratch/stream_mp4.js
rename to scratch/stream_mp4.ts
index 4d0041b..f498edf 100644
--- a/scratch/stream_mp4.js
+++ b/scratch/stream_mp4.ts
@@ -19,10 +19,44 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder from '..';
+import md5File from 'md5-file';
+import WebTorrent from 'webtorrent';
+import fs from 'fs';
+import os from 'os';
 
+// https://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_320x180.mp4
+// https://download.blender.org/peach/bigbuckbunny_movies/big_buck_bunny_1080p_h264.mov
+// http://www.legittorrents.info/download.php?id=7f34612e0fac5e7b051b78bdf1060113350ebfe0&f=Big%20Buck%20Bunny%20(1920x1080%20h.264).torrent
 async function run() {
-  const urls = [ 'file:../../Media/big_buck_bunny_1080p_h264.mov' ];
+  const mediaFile = '../big_buck_bunny_1080p_h264.mov'
+  if (!fs.existsSync(mediaFile)) {
+    console.log(`${mediaFile} is missing Downloading if now`);
+    const client = new WebTorrent()
+    const magnetURI = 'magnet:?xt=urn:btih:P42GCLQPVRPHWBI3PC67CBQBCM2Q5P7A&dn=big_buck_bunny_1080p_h264.mov&xl=725106140&tr=http%3A%2F%2Fblender.waag.org%3A6969%2Fannounce'
+    await new Promise<void>((done) => {
+      client.add(magnetURI, { path: '..' }, function (torrent) {
+        // Got torrent metadata!
+        console.log('Client is downloading:', torrent.infoHash)
+        torrent.files.forEach(function (file) {
+          // Display the file by appending it to the DOM. Supports video, audio, images, and
+          // more. Specify a container element (CSS selector or reference to DOM node).
+          console.log(file);
+        })
+        torrent.on("done", () => done());
+      })
+    })
+    console.log(`${mediaFile} Downloaded`);
+  }
+  if (!fs.existsSync(mediaFile)) {
+    console.log(`${mediaFile} still missing`);
+    return;
+  }
+  const sumSrc = await md5File(mediaFile);
+  if (sumSrc !== 'c23ab2ff12023c684f46fcc02c57b585')
+    throw ('invalid Src md5');
+
+  const urls = [`file:${mediaFile}`];
   const spec = { start: 0, end: 24 };
 
   const params = {
@@ -33,7 +67,8 @@ async function run() {
         ],
         filterSpec: '[in0:v] scale=1280:720, colorspace=all=bt709 [out0:v]',
         streams: [
-          { name: 'h264', time_base: [1, 90000],
+          {
+            name: 'h264', time_base: [1, 90000],
             codecpar: {
               width: 1280, height: 720, format: 'yuv422p', color_space: 'bt709',
               sample_aspect_ratio: [1, 1]
@@ -49,7 +84,8 @@ async function run() {
         ],
         filterSpec: '[in0:a] aformat=sample_fmts=fltp:channel_layouts=mono [out0:a]',
         streams: [
-          { name: 'aac', time_base: [1, 90000],
+          {
+            name: 'aac', time_base: [1, 90000],
             codecpar: {
               sample_rate: 48000, format: 'fltp', frame_size: 1024,
               channels: 1, channel_layout: 'mono'
@@ -68,6 +104,15 @@ async function run() {
   const beamStreams = await beamcoder.makeStreams(params);
 
   await beamStreams.run();
+
+  const sumDest = await md5File('temp.mp4');
+  if (os.platform() === 'darwin') {
+    if (sumDest !== '784983c8128db6797be07076570aa179')
+      throw ('invalid Dst md5');
+  } else {
+    if (sumDest !== 'f08742dd1982073c2eb01ba6faf86d63')
+      throw ('invalid Dst md5');
+  }
 }
 
 console.log('Running mp4 maker');
diff --git a/scratch/stream_mux.js b/scratch/stream_mux.ts
similarity index 89%
rename from scratch/stream_mux.js
rename to scratch/stream_mux.ts
index c876fe6..77b18d0 100644
--- a/scratch/stream_mux.js
+++ b/scratch/stream_mux.ts
@@ -19,13 +19,13 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
-const fs = require('fs');
+import beamcoder, { MuxerStream, Packet } from '..';
+import fs from 'fs';
 
 async function run() {
   let demuxer = await beamcoder.demuxer('../../media/sound/BBCNewsCountdown.wav');
 
-  let muxerStream = beamcoder.muxerStream({ highwaterMark: 65536 });
+  let muxerStream = new MuxerStream({ highwaterMark: 65536 });
   muxerStream.pipe(fs.createWriteStream('test.wav'));
 
   let muxer = muxerStream.muxer({ format_name: 'wav' });
@@ -35,7 +35,7 @@ async function run() {
   await muxer.openIO();
 
   await muxer.writeHeader();
-  let packet = {};
+  let packet: Packet = {} as Packet;
   for ( let x = 0 ; x < 10000 && packet !== null ; x++ ) {
     packet = await demuxer.read();
     if (packet)
diff --git a/scratch/stream_pcm.js b/scratch/stream_pcm.ts
similarity index 92%
rename from scratch/stream_pcm.js
rename to scratch/stream_pcm.ts
index 771e30b..bed9908 100644
--- a/scratch/stream_pcm.js
+++ b/scratch/stream_pcm.ts
@@ -19,12 +19,11 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
-const fs = require('fs');
-const util = require('util'); // eslint-disable-line
+import beamcoder, { DemuxerStream, Packet } from '..';
+import fs from 'fs';
 
 async function run() {
-  let demuxerStream = beamcoder.demuxerStream({ highwaterMark: 65536 });
+  let demuxerStream  = new DemuxerStream({ highwaterMark: 65536 });
   // fs.createReadStream('../../media/dpp/AS11_DPP_HD_EXAMPLE_1.mxf').pipe(demuxerStream);
   fs.createReadStream('../../media/sound/BBCNewsCountdown.wav').pipe(demuxerStream);
 
@@ -63,7 +62,7 @@ async function run() {
   // const abuffersink = filterer.graph.filters.find(f => 'abuffersink' === f.filter.name);
   // console.log(util.inspect(abuffersink, {depth: null}));
 
-  let packet = {};
+  let packet = {} as Packet;
   for ( let x = 0 ; x < 10000 && packet !== null ; x++ ) {
     packet = await demuxer.read();
     if (packet && packet.stream_index == 0) {
diff --git a/scratch/stream_wav.js b/scratch/stream_wav.ts
similarity index 97%
rename from scratch/stream_wav.js
rename to scratch/stream_wav.ts
index c6406c6..6d4918b 100644
--- a/scratch/stream_wav.js
+++ b/scratch/stream_wav.ts
@@ -19,7 +19,7 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const beamcoder = require('../index.js');
+import beamcoder from '..';
 
 async function run() {
   const urls = [ 'file:../Media/sound/Countdown.wav' ];
diff --git a/src/decode.cc b/src/decode.cc
index b196ddb..ad6bfab 100644
--- a/src/decode.cc
+++ b/src/decode.cc
@@ -114,9 +114,20 @@ napi_value decoder(napi_env env, napi_callback_info info) {
     CHECK_STATUS;
     status = napi_get_value_int32(env, value, &streamIdx);
     CHECK_STATUS;
-    if (streamIdx < 0 || streamIdx >= (int) format->nb_streams) {
-      NAPI_THROW_ERROR("Stream index is out of bounds for the given format.");
+    if (streamIdx < 0) {
+      char errorMsg[256];
+      sprintf(errorMsg, "Stream index:%d must be positif", streamIdx);
+      napi_throw_error(env, nullptr, errorMsg);
+      return nullptr;
     }
+
+    if (streamIdx >= (int) format->nb_streams) {
+      char errorMsg[256];
+      sprintf(errorMsg, "Stream index is out of bounds for the given format. %d must be < nb_streams(%d)", streamIdx, (int)format->nb_streams);
+      napi_throw_error(env, nullptr, errorMsg);
+      return nullptr;
+    }
+
     params = format->streams[streamIdx]->codecpar;
     codecID = params->codec_id;
     codecName = (char*) avcodec_get_name(params->codec_id);
diff --git a/src/demux.cc b/src/demux.cc
index 6978087..830adf6 100644
--- a/src/demux.cc
+++ b/src/demux.cc
@@ -115,6 +115,9 @@ void demuxerComplete(napi_env env,  napi_status asyncStatus, void* data) {
   tidyCarrier(env, c);
 }
 
+/**
+ * demuxer(options: DemuxerCreateOptions | string): Promise<Demuxer>
+ */
 napi_value demuxer(napi_env env, napi_callback_info info) {
   napi_value resourceName, promise, value, subValue;
   napi_valuetype type;
@@ -142,6 +145,7 @@ napi_value demuxer(napi_env env, napi_callback_info info) {
   REJECT_RETURN;
 
   if (type == napi_string) {
+    // demuxer(options: string): Promise<Demuxer>
     c->status = napi_get_value_string_utf8(env, args[0], nullptr, 0, &strLen);
     REJECT_RETURN;
     c->filename = (const char *) malloc((strLen + 1) * sizeof(char));
@@ -208,7 +212,7 @@ napi_value demuxer(napi_env env, napi_callback_info info) {
       REJECT_RETURN;
     }
   }
-
+  // end of arg reading
   if ((c->filename == nullptr) && (c->adaptor == nullptr)) {
     REJECT_ERROR_RETURN("Neither a filename nor an adaptor have been provided.",
       BEAMCODER_INVALID_ARGS);
diff --git a/test/codecParamsSpec.js b/test/codecParamsSpec.ts
similarity index 98%
rename from test/codecParamsSpec.js
rename to test/codecParamsSpec.ts
index f7a83e0..78fbf30 100644
--- a/test/codecParamsSpec.js
+++ b/test/codecParamsSpec.ts
@@ -19,8 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Creating codec parameters', t => {
   let cps = beamcoder.codecParameters();
diff --git a/test/decoderSpec.js b/test/decoderSpec.ts
similarity index 94%
rename from test/decoderSpec.js
rename to test/decoderSpec.ts
index c427353..faff7d3 100644
--- a/test/decoderSpec.js
+++ b/test/decoderSpec.ts
@@ -19,8 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Creating a decoder', t => {
   let dec = beamcoder.decoder({ name: 'h264' });
@@ -37,6 +37,7 @@ test('Checking the A properties:', t => {
 
   t.deepEqual(dec.active_thread_type, { FRAME: false, SLICE: false},
     'active_thread_type has expected default.');
+  // @ts-expect-error:next-line
   t.throws(() => { dec.active_thread_type = { FRAME: true }; }, /User cannot/,
     'active_thread_type cannot be set.');
 
@@ -47,6 +48,7 @@ test('Checking the A properties:', t => {
 
   t.equals(dec.audio_service_type, 'main',
     'audio_service_type has expected default value.');
+  // @ts-expect-error:next-line
   t.throws(() => { dec.audio_service_type = 'dialogue'; },
     /decoding/, 'cannot be updated when deocoding.');
 
diff --git a/test/demuxerSpec.js b/test/demuxerSpec.ts
similarity index 94%
rename from test/demuxerSpec.js
rename to test/demuxerSpec.ts
index 8ccc400..5675e26 100644
--- a/test/demuxerSpec.js
+++ b/test/demuxerSpec.ts
@@ -19,13 +19,14 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Creating a demuxer', async t => {
   let dm = await beamcoder.demuxer('https://www.elecard.com/storage/video/bbb_1080p_c.ts');
   t.ok(dm, 'is truthy.');
   t.equal(dm.type, 'demuxer', 'type name says demuxer.');
+  // @ts-expect-error:next-line
   t.equal(typeof dm.oformat, 'undefined', 'output format is undefined.');
   t.ok(dm.iformat, 'has an input format.');
   t.equal(dm.iformat.name, 'mpegts', 'input format is mpegts.');
diff --git a/test/encoderSpec.js b/test/encoderSpec.ts
similarity index 93%
rename from test/encoderSpec.js
rename to test/encoderSpec.ts
index 77b98eb..64f6f22 100644
--- a/test/encoderSpec.js
+++ b/test/encoderSpec.ts
@@ -19,8 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Creating a video encoder', t => {
   let enc = beamcoder.encoder({ name: 'h264' });
@@ -47,10 +47,13 @@ test('Checking the A properties:', t => {
 
   t.deepEqual(enc.active_thread_type, { FRAME: false, SLICE: false},
     'active_thread_type has expected default.');
+  // @ts-expect-error:next-line
   t.throws(() => { enc.active_thread_type = { FRAME: true }; }, /User cannot/,
     'active_thread_type cannot be set.');
 
+  // @ts-expect-error:next-line
   t.notOk(enc.apply_cropping, 'apply_cropping not defined for encoding.');
+  // @ts-expect-error:next-line
   t.throws(() => { enc.apply_cropping = 0; }, /encoding/,
     'apply_cropping setting does not throw.');
 
@@ -60,6 +63,7 @@ test('Checking the A properties:', t => {
     'audio_service_type can be updated.');
   t.equals(enc.audio_service_type, 'dialogue',
     'audio_service_type has been updated.');
+  // @ts-expect-error:next-line
   t.throws(() => { enc.audio_service_type = 'wibble'; },
     'audio_service_type throws with unknown value.');
 
diff --git a/test/filtererSpec.js b/test/filtererSpec.ts
similarity index 95%
rename from test/filtererSpec.js
rename to test/filtererSpec.ts
index b1c018c..080e127 100644
--- a/test/filtererSpec.js
+++ b/test/filtererSpec.ts
@@ -19,8 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Create a filterer', async t => {
   let flt = await beamcoder.filterer({
diff --git a/test/formatSpec.js b/test/formatSpec.ts
similarity index 96%
rename from test/formatSpec.js
rename to test/formatSpec.ts
index 8b8ba7e..4246a26 100644
--- a/test/formatSpec.js
+++ b/test/formatSpec.ts
@@ -19,10 +19,11 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
-const isExternal = o => Object.toString(o).indexOf('native code') >= 0;
+const isExternal = (o: any) => (Object as any).toString(o).indexOf('native code') >= 0;
+// const isExternal = o => Object.toString(o).indexOf('native code') >= 0;
 
 test('Creating a format', t => {
   let fmt = beamcoder.format();
@@ -39,7 +40,8 @@ test('Creating a format', t => {
   t.end();
 });
 
-const stripNewStream = ({ newStream, ...others }) => ({ ...others }); // eslint-disable-line no-unused-vars
+// @ts-ignore
+const stripNewStream = ({ newStream, ...others }) => ({ ...others });
 
 test('Minimal JSON serialization', t => {
   let fmt = beamcoder.format();
@@ -306,8 +308,8 @@ test('Test minimal JSON stream', t => {
   let fmt2 = beamcoder.format(JSON.stringify(fmt));
   t.ok(fmt2, 'construction of new format form JSON is truthy.');
   t.equal(fmt2.streams.length, 3, 'has expected number of streams.');
-  t.deepEqual(fmt2.streams.map(JSON.stringify).map(JSON.parse),
-    [s1, s2, s3].map(JSON.stringify).map(JSON.parse), 'has expected streams.');
+  t.deepEqual(fmt2.streams.map(d => JSON.stringify(d)).map(s => JSON.parse(s)),
+    [s1, s2, s3].map(d => JSON.stringify(d)).map(s => JSON.parse(s)), 'has expected streams.');
 
   t.throws(() => fmt2.streams = [], /construction/,
     'cannot set streams after construction.');
diff --git a/test/frameSpec.js b/test/frameSpec.ts
similarity index 97%
rename from test/frameSpec.js
rename to test/frameSpec.ts
index 7f61896..46aa0dc 100644
--- a/test/frameSpec.js
+++ b/test/frameSpec.ts
@@ -19,9 +19,9 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
-const util = require('util');
+import test from 'tape';
+import beamcoder from '..';
+import util from 'util';
 
 test('Create a frame', t => {
   let fr = beamcoder.frame();
diff --git a/test/introspectionSpec.js b/test/introspectionSpec.ts
similarity index 96%
rename from test/introspectionSpec.js
rename to test/introspectionSpec.ts
index 87d3375..31a5137 100644
--- a/test/introspectionSpec.js
+++ b/test/introspectionSpec.ts
@@ -19,8 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Version information', t => {
   const verPos = beamcoder.avVersionInfo().indexOf('5.');
diff --git a/test/mp4FullTest.ts b/test/mp4FullTest.ts
new file mode 100644
index 0000000..9e1dda8
--- /dev/null
+++ b/test/mp4FullTest.ts
@@ -0,0 +1,120 @@
+import test from 'tape';
+import { makeSources, makeStreams } from '..';
+import md5File from 'md5-file';
+import WebTorrent from 'webtorrent';
+import fs from 'fs';
+import os from 'os';
+
+test('recompress mp4', async t => {
+  async function run() {
+    const mediaFile = '../big_buck_bunny_1080p_h264.mov'
+    if (!fs.existsSync(mediaFile)) {
+      console.log(`${mediaFile} is missing Downloading it, now using torrent magnet link.`);
+      const client = new WebTorrent()
+      const magnetURI = 'magnet:?xt=urn:btih:P42GCLQPVRPHWBI3PC67CBQBCM2Q5P7A&dn=big_buck_bunny_1080p_h264.mov&xl=725106140&tr=http%3A%2F%2Fblender.waag.org%3A6969%2Fannounce'
+      await new Promise<void>((done) => {
+        client.add(magnetURI, { path: '..' }, function (torrent) {
+          let len = 0;
+          let ready = '0';
+          // Got torrent metadata!
+          console.log('Client is downloading:', torrent.infoHash)
+          torrent.files.forEach(function (file) {
+            // Display the file by appending it to the DOM. Supports video, audio, images, and
+            // more. Specify a container element (CSS selector or reference to DOM node).
+            console.log(file.length);
+          })
+          torrent.on("done", () => done());
+          torrent.on("wire", (wire, addr) => console.log(`wire ${wire} addr: ${addr}`));
+          torrent.on('download', (bytes: number) => {
+            len += bytes;
+            let ready2 = (len / (1024 * 1024)).toFixed(2);
+            if (ready != ready2) {
+              ready = ready2;
+              console.log(`${ready2} downloaded to ${mediaFile}`);
+            }
+          });
+        })
+      })
+      console.log(`${mediaFile} Downloaded`);
+      client.destroy();
+    }
+    if (!fs.existsSync(mediaFile)) {
+      console.log(`${mediaFile} still missing`);
+      return;
+    }
+
+    const src = mediaFile;
+    const sumSrc = await md5File(src);
+
+    t.equal(sumSrc, 'c23ab2ff12023c684f46fcc02c57b585', 'source File have incrrrect md5sum');
+
+    const urls = [`file:${src}`];
+    const spec = {
+      start: 0,
+      end: 24
+    };
+
+    const params = {
+      video: [{
+        sources: [{
+          url: urls[0],
+          ms: spec,
+          streamIndex: 0
+        }],
+        filterSpec: '[in0:v] scale=1280:720, colorspace=all=bt709 [out0:v]',
+        streams: [{
+          name: 'h264',
+          time_base: [1, 90000],
+          codecpar: {
+            width: 1280,
+            height: 720,
+            format: 'yuv422p',
+            color_space: 'bt709',
+            sample_aspect_ratio: [1, 1]
+          }
+        }]
+      }],
+      audio: [{
+        sources: [{
+          url: urls[0],
+          ms: spec,
+          streamIndex: 2
+        }],
+        filterSpec: '[in0:a] aformat=sample_fmts=fltp:channel_layouts=mono [out0:a]',
+        streams: [{
+          name: 'aac',
+          time_base: [1, 90000],
+          codecpar: {
+            sample_rate: 48000,
+            format: 'fltp',
+            frame_size: 1024,
+            channels: 1,
+            channel_layout: 'mono'
+          }
+        }]
+      },],
+      out: {
+        formatName: 'mp4',
+        url: 'file:temp.mp4'
+      }
+    };
+
+    await makeSources(params);
+    const beamStreams = await makeStreams(params);
+
+    await beamStreams.run();
+
+    const sumDest = await md5File('temp.mp4');
+
+    if (os.platform() === 'darwin') {
+      t.equal(sumDest, '784983c8128db6797be07076570aa179', 'dest File have incorrect md5sum');
+    } else {
+      t.equal(sumDest, 'f08742dd1982073c2eb01ba6faf86d63', 'dest File have incorrect md5sum');
+    }
+  }
+
+  console.log('Running mp4 maker');
+  return run();
+  // .then(() => console.log(`Finished ${Date.now() - start}ms`))
+  //.catch(console.error);
+});
diff --git a/test/muxerSpec.js b/test/muxerSpec.ts
similarity index 94%
rename from test/muxerSpec.js
rename to test/muxerSpec.ts
index b7069f2..5a54c10 100644
--- a/test/muxerSpec.js
+++ b/test/muxerSpec.ts
@@ -19,12 +19,13 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Creating a muxer', t => {
   let mx = beamcoder.muxer({ name: 'mpegts' });
   t.ok(mx, 'is truthy.');
+  // @ts-expect-error
   t.equal(typeof mx.iformat, 'undefined', 'input format is undefined.');
   t.ok(mx.oformat, 'has output format.');
   t.equal(mx.oformat.name, 'mpegts', 'output format is mpegts.');
diff --git a/test/packetSpec.js b/test/packetSpec.ts
similarity index 98%
rename from test/packetSpec.js
rename to test/packetSpec.ts
index b65a5e5..06c2287 100644
--- a/test/packetSpec.js
+++ b/test/packetSpec.ts
@@ -19,8 +19,8 @@
   14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
 */
 
-const test = require('tape');
-const beamcoder = require('../index.js');
+import test from 'tape';
+import beamcoder from '..';
 
 test('Create a packet', t => {
   let pkt = beamcoder.packet();
@@ -72,6 +72,7 @@ test('Minimal JSON serialization', t => {
 });
 
 test('Maximal JSON serialization', t => {
+  //@ts-ignore
   let pkt = beamcoder.packet({ type: 'Packet',
     pts: 42,
     dts: 43,
diff --git a/ts/beamcoder.ts b/ts/beamcoder.ts
new file mode 100644
index 0000000..7ce2834
--- /dev/null
+++ b/ts/beamcoder.ts
@@ -0,0 +1,27 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import bindings from 'bindings';
+import type * as Beamcodere from './types';
+declare type BeamcoderType = typeof Beamcodere;
+const beamcoder = bindings('beamcoder') as BeamcoderType;
+export default beamcoder;
\ No newline at end of file
diff --git a/ts/calcStats.ts b/ts/calcStats.ts
new file mode 100644
index 0000000..f368c26
--- /dev/null
+++ b/ts/calcStats.ts
@@ -0,0 +1,39 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+export interface ffStats {
+    mean: number;
+    stdDev: number;
+    max: number;
+    min: number;
+}
+export default function calcStats<K extends string, P extends string>(arr: Array<{ [key in K]: { [prop in P]: number } }>, elem: K, prop: P): ffStats {
+    const values: number[] = arr.filter(cur => cur[elem]).map(cur => cur[elem][prop]);
+    const mean: number = values.reduce((acc, cur) => acc + cur, 0) / arr.length;
+    const max: number = Math.max(...values)
+    const min: number = Math.min(...values)
+    // standard deviation
+    const sumDelta: number = values.reduce((acc, cur) => acc + Math.pow(cur - mean, 2), 0);
+    const stdDev: number = Math.pow(sumDelta / arr.length, 0.5);
+    return { mean, stdDev, max, min };
+  };
+  
+  
\ No newline at end of file
diff --git a/ts/demuxerStream.ts b/ts/demuxerStream.ts
new file mode 100644
index 0000000..f46c70e
--- /dev/null
+++ b/ts/demuxerStream.ts
@@ -0,0 +1,62 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import { governor as Governor } from './types/governor';
+import beamcoder from './beamcoder'
+import { Writable } from 'stream';
+import { Demuxer, InputFormat } from './types';
+
+/**
+ * Create a WritableDemuxerStream to allow streaming to a Demuxer
+ * @param options.highwaterMark Buffer level when `stream.write()` starts returng false.
+ * @returns A WritableDemuxerStream that can be streamed to.
+ */
+export default class DemuxerStream extends Writable {
+  private governor = new beamcoder.governor({});
+  constructor(params: { highwaterMark?: number }) {
+    super({
+      highWaterMark: params.highwaterMark || 16384,
+      write: (chunk, encoding, cb) => {
+        (async () => {
+          await this.governor.write(chunk);
+          cb();
+        })();
+      }
+    })
+    this.on('finish', () => this.governor.finish());
+    this.on('error', console.error);
+  }
+  
+  /**
+   * Create a demuxer for this source
+   * @param options a DemuxerCreateOptions object
+   * @returns a promise that resolves to a Demuxer when it has determined sufficient
+   * format details by consuming data from the source. The promise will wait indefinitely 
+   * until sufficient source data has been read.
+   */
+  public demuxer(options?: { iformat?: InputFormat, options?: { [key: string]: any }, governor?: Governor }): Promise<Demuxer>{
+    options.governor = this.governor;
+    // delay initialisation of demuxer until stream has been written to - avoids lock-up
+    return new Promise(resolve => setTimeout(async () => resolve(await beamcoder.demuxer(options)), 20));
+  };
+
+}
+  
diff --git a/ts/frameDicer.ts b/ts/frameDicer.ts
new file mode 100644
index 0000000..acfa5d3
--- /dev/null
+++ b/ts/frameDicer.ts
@@ -0,0 +1,113 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import { CodecContext } from "./types/CodecContext";
+import { Frame } from "./types/Frame";
+import beamcoder from './beamcoder'
+
+export default class frameDicer {
+  private doDice: boolean;
+  private lastBuf: Buffer[] = [];
+  private lastFrm: Frame = null as Frame;
+  private sampleBytes = 4; // Assume floating point 4 byte samples for now...
+  private nullBuf: Buffer[] = [];
+  private dstFrmBytes: number;//  = dstNumSamples * this.sampleBytes;
+  private dstNumSamples: number;// = encoder.frame_size;
+
+  constructor(encoder: CodecContext, private isAudio: boolean) {
+    const numChannels = encoder.channels;
+    this.dstNumSamples = encoder.frame_size;
+    this.dstFrmBytes = this.dstNumSamples * this.sampleBytes;
+    this.doDice = false === beamcoder.encoders()[encoder.name].capabilities.VARIABLE_FRAME_SIZE;
+
+    for (let b = 0; b < numChannels; ++b)
+      this.nullBuf.push(Buffer.alloc(0));
+  }
+
+  private addFrame(srcFrm: Frame): Frame[] {
+    let result: Frame[] = [];
+    let dstFrm: Frame;
+    let curStart = 0;
+    if (!this.lastFrm) {
+      this.lastFrm = beamcoder.frame(srcFrm.toJSON());
+      this.lastBuf = this.nullBuf;
+      this.dstFrmBytes = this.dstNumSamples * this.sampleBytes;
+    }
+
+    if (this.lastBuf[0].length > 0)
+      dstFrm = beamcoder.frame(this.lastFrm.toJSON());
+    else
+      dstFrm = beamcoder.frame(srcFrm.toJSON());
+    dstFrm.nb_samples = this.dstNumSamples;
+    dstFrm.pkt_duration = this.dstNumSamples;
+
+    while (curStart + this.dstFrmBytes - this.lastBuf[0].length <= srcFrm.nb_samples * this.sampleBytes) {
+      const resFrm = beamcoder.frame(dstFrm.toJSON());
+      resFrm.data = this.lastBuf.map((d, i) =>
+        Buffer.concat([
+          d, srcFrm.data[i].slice(curStart, curStart + this.dstFrmBytes - d.length)],
+          this.dstFrmBytes));
+      result.push(resFrm);
+
+      dstFrm.pts += this.dstNumSamples;
+      dstFrm.pkt_dts += this.dstNumSamples;
+      curStart += this.dstFrmBytes - this.lastBuf[0].length;
+      this.lastFrm.pts = 0;
+      this.lastFrm.pkt_dts = 0;
+      this.lastBuf = this.nullBuf;
+    }
+
+    this.lastFrm.pts = dstFrm.pts;
+    this.lastFrm.pkt_dts = dstFrm.pkt_dts;
+    this.lastBuf = srcFrm.data.map(d => d.slice(curStart, srcFrm.nb_samples * this.sampleBytes));
+
+    return result;
+  };
+
+  private getLast(): Frame[] {
+    let result: Frame[] = [];
+    if (this.lastBuf[0].length > 0) {
+      const resFrm = beamcoder.frame(this.lastFrm.toJSON());
+      resFrm.data = this.lastBuf.map(d => d.slice(0));
+      resFrm.nb_samples = this.lastBuf[0].length / this.sampleBytes;
+      resFrm.pkt_duration = resFrm.nb_samples;
+      this.lastFrm.pts = 0;
+      this.lastBuf = this.nullBuf;
+      result.push(resFrm);
+    }
+    return result;
+  };
+
+  public dice(frames: Frame[], flush = false): Frame[] {
+    if (this.isAudio && this.doDice) {
+      let result: Frame[] = [];
+      for (const frm of frames)
+        this.addFrame(frm).forEach(f => result.push(f));
+      if (flush)
+        this.getLast().forEach(f => result.push(f));
+      return result;
+    }
+    return frames;
+  };
+}
+
+
+
diff --git a/ts/index.ts b/ts/index.ts
new file mode 100644
index 0000000..9051d6f
--- /dev/null
+++ b/ts/index.ts
@@ -0,0 +1,56 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import beamcoder from './beamcoder';
+
+export { default as demuxerStream } from './DemuxerStream';
+export { default as muxerStream } from './MuxerStream';
+
+export { default as DemuxerStream } from './DemuxerStream';
+export { default as MuxerStream } from './MuxerStream';
+
+export { default as makeSources } from './makeSources';
+export { default as makeStreams } from './makeStreams';
+
+export { getRaw, getHTML } from './utils';
+
+// Provide useful debug on segfault-related crash
+import SegfaultHandler from 'segfault-handler';
+SegfaultHandler.registerHandler('crash.log');
+
+export function splash() {
+  const splash = `Aerostat Beam Coder  Copyright (C) 2019  Streampunk Media Ltd
+  GPL v3.0 or later license. This program comes with ABSOLUTELY NO WARRANTY.
+  This is free software, and you are welcome to redistribute it
+  under certain conditions. Conditions and warranty at:
+  https://github.com/Streampunk/beamcoder/blob/master/LICENSE`;
+  
+  console.log(splash);
+  console.log('Using FFmpeg version', beamcoder.avVersionInfo());  
+}
+
+export { Codec, CodecContext, CodecPar, Decoder, DecodedFrames, Demuxer, EncodedPackets, Encoder, Filter } from './types';
+export { MediaType, FilterLink, FilterContext, FilterGraph, Filterer, InputFormat, OutputFormat, Frame } from './types';
+export { SampleFormat, HWDeviceContext, HWFramesContext, Muxer, Packet, PrivClass, Disposition, Stream } from './types';
+export type { governor} from './types';
+
+export default beamcoder;
diff --git a/ts/install_ffmpeg.ts b/ts/install_ffmpeg.ts
new file mode 100644
index 0000000..00d4517
--- /dev/null
+++ b/ts/install_ffmpeg.ts
@@ -0,0 +1,165 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg.
+  Copyright (C) 2019  Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import os from 'os';
+import fs from 'fs';
+import path from 'path';
+import util from 'util';
+import child_process, { ChildProcess } from 'child_process';
+import { getHTML, getRaw } from './utils';
+const { mkdir, access, rename } = fs.promises;
+const [execFile, exec] = [child_process.execFile, child_process.exec].map(util.promisify);
+import unzip from 'unzipper';
+
+async function inflate(rs: NodeJS.ReadableStream, folder: string, name: string): Promise<void> {
+  // const unzip = require('unzipper');
+  const directory = await unzip.Open.file(`${folder}/${name}.zip`);
+  const dest = path.resolve(`./${folder}/${name}`);
+  const directoryName = directory.files[0].path;
+  return new Promise((comp, err) => {
+    console.log(`Unzipping '${folder}/${name}.zip'.`);
+    rs.pipe(unzip.Extract({ path: folder }).on('close', async () => {
+      await rename(`./${folder}/${directoryName}`, dest)
+      console.log(`Unzipping of '${folder}/${name}.zip' to ${dest} completed.`);
+      comp();
+    }));
+    rs.on('error', err);
+  });
+}
+
+async function win32(): Promise<void> {
+  console.log('Checking/Installing FFmpeg dependencies for Beam Coder on Windows.');
+  try {
+    await mkdir('ffmpeg');
+  } catch (e) {
+    if (e.code !== 'EEXIST') {
+      throw e;
+    }
+  };
+  const ffmpegFilename = 'ffmpeg-5.x-win64-shared';
+  try {
+    const file = `ffmpeg/${ffmpegFilename}`;
+    await access(file, fs.constants.R_OK)
+    console.log(`${path.resolve(file)} Present, Ok`)
+  } catch (e) {
+    const html = await getHTML('https://github.com/BtbN/FFmpeg-Builds/wiki/Latest', 'latest autobuilds');
+    const htmlStr = html.toString('utf-8');
+    const m = htmlStr.match(/<p><a href="([^"]+)">win64-gpl-shared-5[0-9.]+<\/a><\/p>/);
+    if (!m) {
+      throw new Error('Failed to find latest v5.x autobuild from "https://github.com/BtbN/FFmpeg-Builds/wiki/Latest"');
+    }
+    const downloadSource = m[1];
+    const destZip = path.resolve(`ffmpeg/${ffmpegFilename}.zip`);
+    console.log(`Downloading ffmpeg zip to ${destZip}`);
+    let ws_shared = fs.createWriteStream(destZip);
+    try {
+      await getRaw(ws_shared, downloadSource, `${ffmpegFilename}.zip`)
+    } catch (err) {
+      if (err.name === 'RedirectError') {
+        const redirectURL = err.message;
+        await getRaw(ws_shared, redirectURL, `${ffmpegFilename}.zip`);
+      } else
+        throw err;
+    }
+    // await exec('npm install unzipper --no-save');
+    let rs_shared = fs.createReadStream(destZip);
+    await inflate(rs_shared, 'ffmpeg', `${ffmpegFilename}`);
+  };
+}
+
+async function linux(): Promise<number> {
+  console.log('Checking FFmpeg dependencies for Beam Coder on Linux.');
+  const { stdout } = await execFile('ldconfig', ['-p']).catch(console.error);
+  let result = 0;
+  for (const fn of ['avcodec.so.59', 'avformat.so.59', 'avdevice.so.59', 'avfilter.so.8', 'avutil.so.57', 'postproc.so.56', 'swresample.so.4', 'swscale.so.6']) {
+    if (stdout.indexOf(`lib${fn}`) < 0) {
+      console.error(`lib${fn} is not installed.`);
+      result = 1;
+    }
+  }
+  if (result === 1) {
+    console.log(`Try running the following (Ubuntu/Debian):
+sudo add-apt-repository ppa:jonathonf/ffmpeg-4
+sudo apt-get install libavcodec-dev libavformat-dev libavdevice-dev libavfilter-dev libavutil-dev libpostproc-dev libswresample-dev libswscale-dev`);
+    process.exit(1);
+  }
+  return result;
+}
+
+async function darwin(): Promise<0> {
+  console.log('Checking for FFmpeg dependencies via HomeBrew.');
+  let output: ChildProcess;
+  let returnMessage: string;
+
+  try {
+    output = await exec('brew list ffmpeg');
+    returnMessage = 'FFmpeg already present via Homebrew.';
+  } catch (err) {
+    if ((err as { stderr: string }).stderr !== 'Error: No such keg: /usr/local/Cellar/ffmpeg\n') {
+      console.error(err);
+      console.log('Either Homebrew is not installed or something else is wrong.\nExiting');
+      process.exit(1);
+    }
+    console.log('FFmpeg not installed. Attempting to install via Homebrew.');
+    try {
+      output = await exec('brew install nasm pkg-config texi2html ffmpeg');
+      returnMessage = 'FFmpeg installed via Homebrew.';
+    } catch (err) {
+      console.log('Failed to install ffmpeg:\n');
+      console.error(err);
+      process.exit(1);
+    }
+  }
+  console.log(output.stdout);
+  console.log(returnMessage);
+  return 0;
+}
+
+switch (os.platform()) {
+  case 'win32':
+    if (os.arch() != 'x64') {
+      console.error('Only 64-bit platforms are supported.');
+      process.exit(1);
+    } else {
+      win32().catch(console.error);
+    }
+    break;
+  case 'linux':
+    if (os.arch() != 'x64' && os.arch() != 'arm64') {
+      console.error('Only 64-bit platforms are supported.');
+      process.exit(1);
+    } else {
+      linux();
+    }
+    break;
+  case 'darwin':
+    if (os.arch() != 'x64' && os.arch() != 'arm64') {
+      console.error('Only 64-bit platforms are supported.');
+      process.exit(1);
+    } else {
+      darwin();
+    }
+    break;
+  default:
+    console.error(`Platfrom ${os.platform()} is not supported.`);
+    break;
+}
diff --git a/ts/makeSources.ts b/ts/makeSources.ts
new file mode 100644
index 0000000..e0a194f
--- /dev/null
+++ b/ts/makeSources.ts
@@ -0,0 +1,61 @@
+
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import beamcoder from './beamcoder'
+import { BeamstreamParams, BeamstreamSource, Demuxer } from './types';
+import readStream from './readStream';
+import DemuxerStream from './DemuxerStream';
+
+/**
+ * Initialise the sources for the beamstream process.
+ * Note - the params object is updated by the function.
+ */
+export default async function makeSources(params: BeamstreamParams): Promise<void> {
+  if (!params.video) params.video = [];
+  if (!params.audio) params.audio = [];
+  // collect All source stream from video and audio channels
+  const sources: Array<BeamstreamSource> = [];
+  for (const channel of [...params.video, ...params.audio]){
+    channel.sources.forEach(src => sources.push(src));
+  }
+  // demult all channels
+  const promises = sources.map((src: BeamstreamSource) => {
+    let p: Promise<Demuxer>;
+    if (src.input_stream) {
+      const demuxerStream = new DemuxerStream({ highwaterMark: 1024 });
+      src.input_stream.pipe(demuxerStream);
+      p = demuxerStream.demuxer({ iformat: src.iformat, options: src.options });
+    } else {
+      p = beamcoder.demuxer({ url: src.url, iformat: src.iformat, options: src.options });
+    }
+    p = p.then((fmt) => {
+      src.format = fmt;
+      if (src.ms && !src.input_stream)
+        src.format.seek({ time: src.ms.start });
+      return fmt;
+    })
+    return p;
+  });
+  await Promise.all(promises);
+  sources.forEach((src) => src.stream = readStream({ highWaterMark: 1 }, src.format, src.ms, src.streamIndex));
+}
diff --git a/ts/makeStreams.ts b/ts/makeStreams.ts
new file mode 100644
index 0000000..8dc2c34
--- /dev/null
+++ b/ts/makeStreams.ts
@@ -0,0 +1,188 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import beamcoder from './beamcoder'
+import { BeamstreamChannel, BeamstreamParams, BeamstreamSource, BeamstreamStream, Filterer, FilterLink, Muxer } from './types';
+import serialBalancer from './serialBalancer';
+import runStreams from './runStreams';
+import MuxerStream from './MuxerStream';
+
+/**
+ * Initialise the output streams for the beamstream process.
+ * Note - the params object is updated by the function.
+ * @returns Promise which resolves to an object with a run function that starts the processing
+ */
+export default async function makeStreams(params: BeamstreamParams): Promise<{ run(): Promise<void> }> {
+  if (!params.video) params.video = [];
+  if (!params.audio) params.audio = [];
+
+  params.video.forEach((channel: BeamstreamChannel) => {
+    channel.sources.forEach((src: BeamstreamSource) =>
+      src.decoder = beamcoder.decoder({ demuxer: src.format, stream_index: src.streamIndex }));
+  });
+  params.audio.forEach((channel: BeamstreamChannel) => {
+    channel.sources.forEach((src: BeamstreamSource) =>
+      src.decoder = beamcoder.decoder({ demuxer: src.format, stream_index: src.streamIndex }));
+  });
+
+  const promises: Promise<Filterer>[] = [];
+
+  // VIDEO
+  //////////
+  params.video.forEach((channel: BeamstreamChannel) => {
+    const inputParams = channel.sources.map((src: BeamstreamSource, i: number) => {
+      const { codecpar, time_base, sample_aspect_ratio } = src.format.streams[src.streamIndex];
+      return {
+        name: `in${i}:v`,
+        width: codecpar.width,
+        height: codecpar.height,
+        pixelFormat: codecpar.format,
+        timeBase: time_base,
+        pixelAspect: sample_aspect_ratio
+      };
+    });
+    const outputParams = channel.streams.map((str: BeamstreamStream, i: number) => ({ name: `out${i}:v`, pixelFormat: str.codecpar.format }));
+    const { filterSpec } = channel;
+    const prms = beamcoder.filterer({ filterType: 'video', inputParams, outputParams, filterSpec })
+    promises.push(prms.then(filter => channel.filter = filter));
+  });
+
+  // AUDIO
+  //////////
+  params.audio.forEach((channel: BeamstreamChannel) => {
+    const inputParams = channel.sources.map((src: BeamstreamSource, i: number) => {
+      const { sample_rate, sample_fmt, channel_layout } = src.decoder;
+      return {
+        name: `in${i}:a`,
+        sampleRate: sample_rate,
+        sampleFormat: sample_fmt,
+        channelLayout: channel_layout,
+        timeBase: src.format.streams[src.streamIndex].time_base
+      };
+    });
+    const outputParams = channel.streams.map((str: BeamstreamStream, i: number) => {
+      const { sample_rate, format, channel_layout } = str.codecpar;
+      return {
+        name: `out${i}:a`,
+        sampleRate: sample_rate,
+        sampleFormat: format,
+        channelLayout: channel_layout
+      };
+    });
+    const { filterSpec } = channel;
+    const prms = beamcoder.filterer({ filterType: 'audio', inputParams, outputParams, filterSpec })
+    promises.push(prms.then(filter => channel.filter = filter));
+  });
+  await Promise.all(promises);
+
+  /**
+   * all channel filter are no filled
+   */
+
+  // params.video.forEach(p => console.log(p.filter.graph.dump()));
+  // params.audio.forEach(p => console.log(p.filter.graph.dump()));
+
+  let mux: Muxer;
+  if (params.out.output_stream) {
+    let muxerStream = new MuxerStream({ highwaterMark: 1024 });
+    muxerStream.pipe(params.out.output_stream);
+    mux = muxerStream.muxer({ format_name: params.out.formatName });
+  } else {
+    mux = beamcoder.muxer({ format_name: params.out.formatName });
+  }
+  params.video.forEach((channel: BeamstreamChannel) => {
+    channel.streams.forEach((str: BeamstreamStream, i: number) => {
+      const encParams = (channel.filter as Filterer).graph.filters.find(f => f.name === `out${i}:v`).inputs[0];
+      str.encoder = beamcoder.encoder({
+        name: str.name,
+        width: encParams.w,
+        height: encParams.h,
+        pix_fmt: encParams.format,
+        sample_aspect_ratio: encParams.sample_aspect_ratio,
+        time_base: encParams.time_base as [number, number],
+        // framerate: [encParams.time_base[1], encParams.time_base[0]],
+        // bit_rate: 2000000,
+        // gop_size: 10,
+        // max_b_frames: 1,
+        // priv_data: { preset: 'slow' }
+        priv_data: { crf: 23 }
+      }); // ... more required ...
+    });
+  });
+
+  // VIDEO
+  //////////
+  params.video.forEach((channel: BeamstreamChannel) => {
+    channel.streams.forEach((str: BeamstreamStream) => {
+      str.stream = mux.newStream({
+        name: str.name,
+        time_base: str.time_base,
+        interleaved: true
+      }); // Set to false for manual interleaving, true for automatic
+      Object.assign(str.stream.codecpar, str.codecpar);
+    });
+  });
+
+  // AUDIO
+  //////////
+  params.audio.forEach((channel: BeamstreamChannel) => {
+    channel.streams.forEach((str: BeamstreamStream, i: number) => {
+      const encParams: FilterLink = (channel.filter as Filterer).graph.filters.find(f => f.name === `out${i}:a`).inputs[0];
+      str.encoder = beamcoder.encoder({
+        name: str.name,
+        sample_fmt: encParams.format,
+        sample_rate: encParams.sample_rate,
+        channel_layout: encParams.channel_layout,
+        flags: { GLOBAL_HEADER: mux.oformat.flags.GLOBALHEADER }
+      });
+      str.codecpar.frame_size = str.encoder.frame_size;
+    });
+  });
+
+  params.audio.forEach((channel: BeamstreamChannel) => {
+    channel.streams.forEach((str: BeamstreamStream) => {
+      str.stream = mux.newStream({
+        name: str.name,
+        time_base: str.time_base,
+        interleaved: true
+      }); // Set to false for manual interleaving, true for automatic
+      Object.assign(str.stream.codecpar, str.codecpar);
+    });
+  });
+  // create runner
+  const run = async () => {
+    await mux.openIO({
+      url: params.out.url ? params.out.url : '',
+      flags: params.out.flags ? params.out.flags : {}
+    });
+    await mux.writeHeader({ options: params.out.options ? params.out.options : {} });
+
+    const muxBalancer = new serialBalancer(mux.streams.length);
+    const muxStreamPromises: Promise<void>[] = [];
+    params.video.forEach(ch => muxStreamPromises.push(runStreams('video', ch.sources, ch.filter as Filterer, ch.streams, mux, muxBalancer)));
+    params.audio.forEach(ch => muxStreamPromises.push(runStreams('audio', ch.sources, ch.filter as Filterer, ch.streams, mux, muxBalancer)));
+    await Promise.all(muxStreamPromises);
+
+    await mux.writeTrailer();
+  }
+  return { run };
+}
diff --git a/ts/muxerStream.ts b/ts/muxerStream.ts
new file mode 100644
index 0000000..0f8089f
--- /dev/null
+++ b/ts/muxerStream.ts
@@ -0,0 +1,67 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import beamcoder from './beamcoder'
+import { Readable } from 'stream';
+import { governor, Muxer, MuxerCreateOptions } from './types';
+
+/**
+ * Create a ReadableMuxerStream to allow streaming from a Muxer
+ * 
+ * A [Node.js Readable stream](https://nodejs.org/docs/latest-v12.x/api/stream.html#stream_readable_streams)
+ * allowing data to be streamed from the muxer to a file or other stream destination such as a network connection
+ * 
+ * @param options.highwaterMark The maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource.
+ * @returns A ReadableMuxerStream that can be streamed from.
+ */
+export default class MuxerStream extends Readable {
+  private governor = new beamcoder.governor({ highWaterMark: 1 });
+  constructor(params: { highwaterMark: number }) {
+    super({
+      highWaterMark: params.highwaterMark || 16384,
+      read: size => {
+        (async () => {
+          const chunk = await this.governor.read(size);
+          if (0 === chunk.length)
+            this.push(null);
+          else
+            this.push(chunk);
+        })
+      }
+    })
+    this.on('end', () => this.governor.finish());
+    this.on('error', console.error);
+  }
+
+
+  /**
+   * Create a demuxer for this source
+   * @param options a DemuxerCreateOptions object
+   * @returns a promise that resolves to a Demuxer when it has determined sufficient
+   * format details by consuming data from the source. The promise will wait indefinitely 
+   * until sufficient source data has been read.
+   */
+  public muxer(options?: MuxerCreateOptions & { governor?: governor }): Muxer {
+    options = options || {};
+    options.governor = this.governor;
+    return beamcoder.muxer(options);
+  };
+}
diff --git a/ts/parallelBalancer.ts b/ts/parallelBalancer.ts
new file mode 100644
index 0000000..281a9f0
--- /dev/null
+++ b/ts/parallelBalancer.ts
@@ -0,0 +1,106 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import { Readable } from 'stream';
+import { DecodedFrames, Frame, Stream } from './types';
+import { Timable, Timables } from './types/time';
+
+export type localFrame = { pkt?: Frame, ts: number, streamIndex: number, final?: boolean, resolve?: () => void };
+type localResult = { done: boolean, value?: { name: string, frames: Timables<Frame> }[] & Timable };
+
+export default class parallelBalancer extends Readable {
+  private pending: localFrame[] = [];
+  private resolveGet: null | ((result: localResult) => void) = null;
+
+  get tag(): 'a' | 'v' {
+    return 'video' === this.streamType ? 'v' : 'a';
+  }
+
+  constructor(params: { name: string, highWaterMark: number }, private streamType: 'video' | 'audio', numStreams: number) {
+    const pullSet = () => new Promise<localResult>(resolve => this.makeSet(resolve));
+    super({
+      objectMode: true,
+      highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
+      async read() {
+        const start = process.hrtime();
+        const reqTime = start[0] * 1e3 + start[1] / 1e6;
+        const result = await pullSet();
+        if (result.done)
+          this.push(null);
+        else {
+          result.value.timings = result.value[0].frames[0].timings;
+          result.value.timings[params.name] = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
+          this.push(result.value);
+        }
+      },
+    })
+    // initialise with negative ts and no pkt
+    // - there should be no output until each stream has sent its first packet
+    for (let s = 0; s < numStreams; ++s)
+      this.pending.push({ ts: -Number.MAX_VALUE, streamIndex: s });
+  }
+
+  private makeSet(resolve: (result: localResult) => void): void {
+    if (!resolve)
+      return;
+    // console.log('makeSet', pending.map(p => p.ts));
+    const nextPends = this.pending.every(pend => pend.pkt) ? this.pending : null;
+    const final = this.pending.filter(pend => true === pend.final);
+    if (nextPends) {
+      nextPends.forEach(pend => pend.resolve());
+      resolve({
+        value: nextPends.map(pend => {
+          return { name: `in${pend.streamIndex}:${this.tag}`, frames: [pend.pkt] };
+        }),
+        done: false
+      });
+      this.resolveGet = null;
+      this.pending.forEach(pend => Object.assign(pend, { pkt: null, ts: Number.MAX_VALUE }));
+    } else if (final.length > 0) {
+      final.forEach(f => f.resolve());
+      resolve({ done: true });
+    } else {
+      this.resolveGet = resolve;
+    }
+  };
+
+  private async pushPkt(pkt: Frame, streamIndex: number, ts: number): Promise<localFrame> {
+    return new Promise(resolve => {
+      Object.assign(this.pending[streamIndex], { pkt, ts, final: pkt ? false : true, resolve });
+      this.makeSet(this.resolveGet);
+    })
+  }
+
+  public async pushPkts(packets: null | DecodedFrames, stream: Stream, streamIndex: number, final = false): Promise<localFrame> {
+    if (packets && packets.frames.length) {
+      let lst: localFrame = { ts: -Number.MAX_VALUE, streamIndex: 0 };
+      for (const pkt of packets.frames) {
+        const ts = pkt.pts * stream.time_base[0] / stream.time_base[1];
+        pkt.timings = packets.timings;
+        lst = await this.pushPkt(pkt, streamIndex, ts);
+      }
+      return lst;
+    } else if (final) {
+      return this.pushPkt(null, streamIndex, Number.MAX_VALUE);
+    }
+  }
+}
diff --git a/ts/readStream.ts b/ts/readStream.ts
new file mode 100644
index 0000000..66e401a
--- /dev/null
+++ b/ts/readStream.ts
@@ -0,0 +1,54 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import { Readable } from 'stream';
+import { Demuxer } from './types/Demuxer';
+import { Packet } from './types/Packet';
+
+export default function readStream(params: { highWaterMark?: number }, demuxer: Demuxer, ms: { end: number }, index: number): Readable {
+    const time_base = demuxer.streams[index].time_base;
+    const end_pts = ms ? ms.end * time_base[1] / time_base[0] : Number.MAX_SAFE_INTEGER;
+    async function getPacket(): Promise<Packet | null> {
+      let packet: Packet = {} as Packet;
+      do { packet = await demuxer.read(); }
+      while (packet && packet.stream_index !== index);
+      return packet;
+    }
+  
+    return new Readable({
+      objectMode: true,
+      highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
+      read() {
+        (async () => {
+          const start = process.hrtime();
+          const reqTime = start[0] * 1e3 + start[1] / 1e6;
+          const packet = await getPacket();
+          if (packet && (packet.pts < end_pts)) {
+            packet.timings = {};
+            packet.timings.read = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
+            this.push(packet);
+          } else
+            this.push(null);
+        })();
+      }
+    });
+  }
+  
\ No newline at end of file
diff --git a/ts/runStreams.ts b/ts/runStreams.ts
new file mode 100644
index 0000000..deaa8c5
--- /dev/null
+++ b/ts/runStreams.ts
@@ -0,0 +1,117 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import teeBalancer from './teeBalancer';
+import { BalanceResult } from './teeBalancer';
+import { default as parallelBalancer, localFrame } from './parallelBalancer';
+import serialBalancer from './serialBalancer';
+import { Stream } from './types/Stream';
+import { DecodedFrames } from './types/Decoder';
+import { Frame } from './types/Frame';
+import { Packet } from './types/Packet';
+import { TotalTimed } from './types/time';
+import { BeamstreamSource, BeamstreamStream } from './types/Beamstreams';
+import { Filterer, FiltererResult } from './types/Filter';
+import { Timable, Timables } from './types/time'
+import { EncodedPackets } from './types/Encoder';
+
+import frameDicer from './frameDicer';
+import transformStream from './transformStream';
+import writeStream from './writeStream';
+import { Muxer } from './types/Muxer';
+
+export default function runStreams(
+    streamType: 'video' | 'audio',
+    sources: Array<BeamstreamSource>,
+    filterer: Filterer,
+    streams: Array<BeamstreamStream>,
+    mux: Muxer,
+    muxBalancer: serialBalancer): Promise<void> {
+    return new Promise<void>((resolve, reject) => {
+      if (!sources.length)
+        return resolve();
+  
+      const timeBaseStream: Stream = sources[0].format.streams[sources[0].streamIndex];
+      const filterBalancer = new parallelBalancer({ name: 'filterBalance', highWaterMark: 1 }, streamType, sources.length);
+  
+      sources.forEach((src: BeamstreamSource, srcIndex: number) => {
+        const decStream = transformStream<Packet, Timable & Promise<DecodedFrames>>(
+          { name: 'decode', highWaterMark: 1 },
+          (pkts: Packet) => src.decoder.decode(pkts),
+          () => src.decoder.flush(), reject);
+  
+        const filterSource = writeStream<DecodedFrames, localFrame>(
+          { name: 'filterSource', highWaterMark: 1 },
+          (pkts: DecodedFrames) => filterBalancer.pushPkts(pkts, src.format.streams[src.streamIndex], srcIndex, false),
+          () => filterBalancer.pushPkts(null, src.format.streams[src.streamIndex], srcIndex, true),
+          reject
+        );
+  
+        src.stream.pipe(decStream).pipe(filterSource);
+      });
+  
+      const streamTee = teeBalancer({ name: 'streamTee', highWaterMark: 1 }, streams.length);
+  
+      const filtStream = transformStream<Timables<DecodedFrames>, Timable & Promise<Array<FiltererResult> & TotalTimed>>({ name: 'filter', highWaterMark: 1 }, (frms: Timables<DecodedFrames>) => {
+        if (filterer.cb) filterer.cb(frms[0].frames[0].pts);
+        // @ts-ignore
+        return filterer.filter(frms);
+      }, () => { }, reject);
+  
+      const streamSource = writeStream<Timables<Frame>, BalanceResult | void>(
+        { name: 'streamSource', highWaterMark: 1 },
+        frms => streamTee.pushFrames(frms),
+        () => streamTee.pushFrames([], true),
+        reject
+      );
+  
+      filterBalancer.pipe(filtStream).pipe(streamSource);
+      streams.forEach((str: BeamstreamStream, i: number) => {
+        const dicer = new frameDicer(str.encoder, 'audio' === streamType);
+  
+        const diceStream = transformStream<Timables<Frame>, Timables<Frame>>(
+          { name: 'dice', highWaterMark: 1 },
+          (frms) => dicer.dice(frms),
+          () => dicer.dice([], true),
+          reject
+        );
+  
+        const encStream = transformStream<Timables<Frame>, Timable & Promise<EncodedPackets>>(
+          { name: 'encode', highWaterMark: 1 },
+          (frms) => str.encoder.encode(frms),
+          () => str.encoder.flush(),
+          reject
+        );
+  
+        const muxStream = writeStream<EncodedPackets, void | Packet>(
+          { name: 'mux', highWaterMark: 1 },
+          (pkts: EncodedPackets) => muxBalancer.writePkts(pkts, timeBaseStream, str.stream, pkts => mux.writeFrame(pkts)),
+          () => muxBalancer.writePkts(null, timeBaseStream, str.stream, pkts => mux.writeFrame(pkts), true),
+          reject
+        );
+  
+        muxStream.on('finish', resolve);
+  
+        streamTee[i].pipe(diceStream).pipe(encStream).pipe(muxStream);
+      });
+    });
+  }
+  
\ No newline at end of file
diff --git a/ts/serialBalancer.ts b/ts/serialBalancer.ts
new file mode 100644
index 0000000..5d1d91a
--- /dev/null
+++ b/ts/serialBalancer.ts
@@ -0,0 +1,71 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+
+import { EncodedPackets, Packet, Stream } from "./types";
+
+export default class serialBalancer {
+  pending: { ts: number, streamIndex: number, resolve?: (result: any) => void, pkt?: Packet | null }[] = [];
+
+  constructor(numStreams: number) {
+    // initialise with negative ts and no pkt
+    // - there should be no output until each stream has sent its first packet
+    for (let s = 0; s < numStreams; ++s)
+      this.pending.push({ ts: -Number.MAX_VALUE, streamIndex: s });
+  }
+
+  private adjustTS(pkt: { pts: number, dts: number, duration: number }, srcTB: [number, number], dstTB: [number, number]) {
+    const adj = (srcTB[0] * dstTB[1]) / (srcTB[1] * dstTB[0]);
+    pkt.pts = Math.round(pkt.pts * adj);
+    pkt.dts = Math.round(pkt.dts * adj);
+    pkt.duration > 0 ? Math.round(pkt.duration * adj) : Math.round(adj);
+  };
+
+  private pullPkts(pkt: null | Packet, streamIndex: number, ts: number): Promise<void | Packet> {
+    return new Promise(resolve => {
+      Object.assign(this.pending[streamIndex], { pkt, ts, resolve });
+      const minTS = this.pending.reduce((acc, pend) => Math.min(acc, pend.ts), Number.MAX_VALUE);
+      // console.log(streamIndex, pending.map(p => p.ts), minTS);
+      const nextPend = this.pending.find(pend => pend.pkt && (pend.ts === minTS));
+      if (nextPend) nextPend.resolve(nextPend.pkt);
+      if (!pkt) resolve(undefined);
+    });
+  };
+
+  public async writePkts(
+    packets: EncodedPackets | null,
+    srcStream: Stream,
+    dstStream: Stream,
+    writeFn: (r: Packet) => Promise<void>,
+    final = false
+  ): Promise<void | Packet> {
+    if (packets && packets.packets.length) {
+      for (const pkt of packets.packets) {
+        pkt.stream_index = dstStream.index;
+        this.adjustTS(pkt, srcStream.time_base, dstStream.time_base);
+        const pktTS = pkt.pts * dstStream.time_base[0] / dstStream.time_base[1];
+        const packet = await this.pullPkts(pkt, dstStream.index, pktTS);
+        await writeFn(packet as Packet);
+      }
+    } else if (final)
+      return this.pullPkts(null, dstStream.index, Number.MAX_VALUE);
+  };
+}
diff --git a/ts/teeBalancer.ts b/ts/teeBalancer.ts
new file mode 100644
index 0000000..ec7027a
--- /dev/null
+++ b/ts/teeBalancer.ts
@@ -0,0 +1,99 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import { Readable } from "stream";
+import { Frame } from "./types/Frame";
+import { Timable, Timables, Timing, TotalTimed } from "./types/time";
+
+export type BalanceResult = { value: { timings: Timing }, done: boolean, final?: boolean };
+
+type teeBalancerType = Readable[] & { pushFrames: (frames: Timables<Frame>, unusedFlag?: boolean) => Promise<BalanceResult | void> };
+
+export default function teeBalancer(params: { name: 'streamTee', highWaterMark?: number }, numStreams: number): teeBalancerType {
+  let resolvePush: null | ((result?: BalanceResult) => void) = null;
+  const pending: Array<{ frames: null | Frame, resolve: null | ((result: { value?: Frame, done: boolean }) => void), final: boolean }> = [];
+  for (let s = 0; s < numStreams; ++s)
+    pending.push({ frames: null, resolve: null, final: false });
+
+  const pullFrame = async (index: number) => {
+
+    return new Promise<{ done: boolean, value?: Frame | null }>(resolve => {
+      if (pending[index].frames) {
+        resolve({ value: pending[index].frames, done: false });
+        Object.assign(pending[index], { frames: null, resolve: null });
+      } else if (pending[index].final)
+        resolve({ done: true });
+      else
+        pending[index].resolve = resolve;
+
+      if (resolvePush && pending.every(p => null === p.frames)) {
+        resolvePush();
+        resolvePush = null;
+      }
+    });
+  };
+
+  const readStreams: teeBalancerType = [] as teeBalancerType;
+  for (let s = 0; s < numStreams; ++s)
+    readStreams.push(new Readable({
+      objectMode: true,
+      highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
+      read() {
+        (async () => {
+          const start = process.hrtime();
+          const reqTime = start[0] * 1e3 + start[1] / 1e6;
+          const result = await pullFrame(s);
+          if (result.done)
+            this.push(null);
+          else {
+            result.value.timings[params.name] = { reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
+            this.push(result.value);
+          }
+        })();
+      },
+    }));
+
+  // {frames: Frame[], name: string}
+  readStreams.pushFrames = (frames: Array<any> & TotalTimed & Timable): Promise<BalanceResult | void> => {
+    return new Promise<BalanceResult | void>(resolve => {
+      pending.forEach((p, index) => {
+        if (frames.length)
+            p.frames = frames[index].frames;
+        else
+          p.final = true;
+      });
+
+      pending.forEach(p => {
+        if (p.resolve) {
+          if (p.frames) {
+            p.frames.timings = frames.timings;
+            p.resolve({ value: p.frames, done: false });
+          } else if (p.final)
+            p.resolve({ done: true });
+        }
+        Object.assign(p, { frames: null, resolve: null });
+      });
+      resolvePush = resolve;
+    });
+  };
+
+  return readStreams;
+}
diff --git a/ts/transformStream.ts b/ts/transformStream.ts
new file mode 100644
index 0000000..f3957b6
--- /dev/null
+++ b/ts/transformStream.ts
@@ -0,0 +1,53 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import { Transform } from 'stream';
+import { Timable } from './types/time'
+
+export default function transformStream<SRC extends Timable, DST extends Timable>(
+    params: { name: 'encode' | 'dice' | 'decode' | 'filter', highWaterMark: number },
+    processFn: (val: SRC) => DST,
+    flushFn: () => DST | null | void,
+    reject: (err?: Error) => void) {
+    return new Transform({
+      objectMode: true,
+      highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
+      transform(val: SRC, encoding, cb) {
+        (async () => {
+          const start = process.hrtime();
+          const reqTime = start[0] * 1e3 + start[1] / 1e6;
+          const result = await processFn(val);
+          result.timings = val.timings;
+          if (result.timings)
+            result.timings[params.name] = { reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
+          cb(null, result);
+        })().catch(cb);
+      },
+      flush(cb) {
+        (async () => {
+          const result = flushFn ? await flushFn() : null;
+          if (result) result.timings = {};
+          cb(null, result);
+        })().catch(cb);
+      }
+    }).on('error', err => reject(err));
+  }
+  
\ No newline at end of file
diff --git a/ts/types/BeamcoderType.d.ts b/ts/types/BeamcoderType.d.ts
new file mode 100644
index 0000000..e0245be
--- /dev/null
+++ b/ts/types/BeamcoderType.d.ts
@@ -0,0 +1,344 @@
+import { Codec } from "./Codec";
+import { CodecPar } from "./CodecPar";
+import { Decoder } from "./Decoder";
+import { Demuxer, DemuxerCreateOptions } from "./Demuxer";
+import { Encoder } from "./Encoder";
+import { FormatContext, InputFormat, OutputFormat } from "./FormatContext";
+import { Frame, PixelFormat, SampleFormat } from "./Frame";
+import { Packet, PacketFlags } from "./Packet";
+import { PrivClass } from "./PrivClass";
+import { WritableDemuxerStream, ReadableMuxerStream, BeamstreamParams } from './Beamstreams';
+import { Filter, Filterer, FiltererAudioOptions, FiltererVideoOptions } from "./Filter";
+import { commonEncoderParms } from './params';
+import { Muxer, MuxerCreateOptions } from "./Muxer";
+import type { Governor } from './Governor';
+
+export interface BeamcoderType extends ReadableMuxerStream {
+    /** Create object for AVIOContext based buffered I/O */
+    governor: typeof Governor;
+    /**
+     * FFmpeg version string. This usually is the actual release
+     * version number or a git commit description. This string has no fixed format
+     * and can change any time. It should never be parsed by code.
+     */
+    avVersionInfo(): string
+    /**
+     * Create a demuxer for this source
+     * @param options a DemuxerCreateOptions object
+     * @returns a promise that resolves to a Demuxer when it has determined sufficient 
+     * format details by consuming data from the source. The promise will wait indefinitely 
+     * until sufficient source data has been read.
+     */
+    // this code look to have error....
+    demuxer(options: { governor?: Governor, url?: string, iformat?: InputFormat, options?: { governor: Governor } } | string): Promise<Demuxer>
+    // url: src.url, iformat: src.iformat, options: src.options 
+    /**
+     * Create a WritableDemuxerStream to allow streaming to a Demuxer
+     * @param options.highwaterMark Buffer level when `stream.write()` starts returng false.
+     * @returns A WritableDemuxerStream that can be streamed to.
+     */
+    demuxerStream(options: { highwaterMark?: number }): WritableDemuxerStream;
+    /**
+     * Initialise the sources for the beamstream process.
+     * Note - the params object is updated by the function.
+     */
+    makeSources(params: BeamstreamParams): Promise<void>
+    /**
+     * Initialise the output streams for the beamstream process.
+     * Note - the params object is updated by the function.
+     * @returns Promise which resolves to an object with a run function that starts the processing
+     */
+    makeStreams(params: BeamstreamParams): Promise<{ run(): Promise<void> }>
+    /**
+     * Create a ReadableMuxerStream to allow streaming from a Muxer
+     * @param options.highwaterMark The maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource.
+     * @returns A ReadableMuxerStream that can be streamed from.
+     */
+    muxerStream(options: { highwaterMark?: number }): ReadableMuxerStream;
+    /**
+     * Create a filterer
+     * @param options parameters to set up the type, inputs, outputs and spec of the filter
+     * @returns Promise that resolve to a Filterer on success
+     */
+    filterer(options: FiltererVideoOptions | FiltererAudioOptions): Promise<Filterer>
+
+    /**
+     * Provides a list and details of all the available decoders
+     * @returns an object with name and details of each of the available decoders
+     */
+    decoders(): { [key: string]: Codec }
+    /** 
+     * Create a decoder by name
+     * @param name The codec name required
+     * @param ... Any non-readonly parameters from the Decoder object as required
+     * @returns A Decoder object - note creation is synchronous
+     */
+    // decoder(options: { demuxer: Demuxer | Promise<Demuxer>, stream_index: number }): Decoder // { name: string, [key: string]: any }
+    decoder(options: { name: string, [key: string]: any }): Decoder
+
+    /**
+     * Create a decoder by codec_id
+     * @param codec_id The codec ID from AV_CODEC_ID_xxx
+     * @param ... Any non-readonly parameters from the Decoder object as required
+     * @returns A Decoder object - note creation is synchronous
+     */
+    decoder(options: { codec_id: number, [key: string]: any }): Decoder
+    /**
+     * Create a decoder from a demuxer and a stream_index
+     * @param demuxer An initialised Demuxer object
+     * @param stream_index The stream number of the demuxer object to be used to initialise the decoder
+     * @param ... Any non-readonly parameters from the Decoder object as required
+     * @returns A Decoder object - note creation is synchronous
+     */
+    decoder(options: { demuxer: Demuxer, stream_index: number, [key: string]: any }): Decoder
+    /**
+     * Create a decoder from a CodecPar object
+     * @param params CodecPar object whose codec name or id will be used to initialise the decoder
+     * @param ... Any non-readonly parameters from the Decoder object as required
+     * @returns A Decoder object - note creation is synchronous
+     */
+    decoder(options: { params: CodecPar, [key: string]: any }): Decoder
+    /**
+     * Create a frame for encoding or filtering
+     * Set parameters as required from the Frame object
+     */
+    frame(options: { [key: string]: any, data?: Array<Buffer> } | string): Frame;
+    /**
+     * Provides a list and details of all the available encoders
+     * @returns an object with name and details of each of the available encoders
+     */
+    encoders(): { [key: string]: Codec };
+    /** 
+     * Create an encoder by name
+     * @param name The codec name required
+     * @param ... Any non-readonly parameters from the Encoder object as required
+     * @returns An Encoder object - note creation is synchronous
+     */
+    encoder(options: commonEncoderParms & { name: string }): Encoder
+    /**
+     * Create an encoder by codec_id
+     * @param codec_id The codec ID from AV_CODEC_ID_xxx
+     * @param ... Any non-readonly parameters from the Encoder object as required
+     * @returns An Encoder object - note creation is synchronous
+     */
+    encoder(options: commonEncoderParms & { codec_id: number }): Encoder
+    /**
+     * Packets for decoding can be created without reading them from a demuxer
+     * Set parameters as required from the Packet object, passing in a buffer and the required size in bytes
+     */
+    packet(options?: string | {
+        flags?: Partial<PacketFlags>,
+        pts?: number,
+        dts?: number,
+        stream_index?: number,
+        data: Buffer,
+        size?: number,
+        side_data?: any,
+        [key: string]: any,
+    }): Packet
+
+    /** List the available codecs */
+    codecs(): { [key: string]: { encoder?: Codec, decoder?: Codec } }
+
+    /**
+     * Provides a list and details of all the available demuxer input formats
+     * @returns an object with details of all the available demuxer input formats
+     */
+    demuxers(): { [key: string]: InputFormat }
+
+    /**
+    * Create a demuxer to read from a URL or filename
+    * @param url a string describing the source to be read from (may contain %d for a sequence of numbered files).
+    * @returns a promise that resolves to a Demuxer when it has determined sufficient 
+    * format details by consuming data from the source. The promise will wait indefinitely 
+    * until sufficient source data has been read.
+    */
+    demuxer(url: string): Promise<Demuxer>
+
+    /**
+     * For formats that require additional metadata, such as the rawvideo format,
+     * it may be necessary to pass additional information such as image size or pixel format to Demuxer creation.
+     * @param options a DemuxerCreateOptions object
+     * @returns a promise that resolves to a Demuxer when it has determined sufficient 
+     * format details by consuming data from the source. The promise will wait indefinitely 
+     * until sufficient source data has been read.
+     */
+    demuxer(options: DemuxerCreateOptions): Promise<Demuxer>
+
+    /**
+ * Provides a list and details of all the available encoders
+ * @returns an object with name and details of each of the available encoders
+ */
+    encoders(): { [key: string]: Codec }
+    /** 
+     * Create an encoder by name
+     * @param name The codec name required
+     * @param ... Any non-readonly parameters from the Encoder object as required
+     * @returns An Encoder object - note creation is synchronous
+     */
+    encoder(options: { name: string, [key: string]: any }): Encoder
+    /**
+     * Create an encoder by codec_id
+     * @param codec_id The codec ID from AV_CODEC_ID_xxx
+     * @param ... Any non-readonly parameters from the Encoder object as required
+     * @returns An Encoder object - note creation is synchronous
+     */
+    encoder(options: { codec_id: number, [key: string]: any }): Encoder
+    /**
+     * Return the output format in the list of registered output formats which best matches the provided name,
+     * or return null if there is no match.
+     */
+    guessFormat(name: string): OutputFormat | null;
+
+    format(options?: string | { [key: string]: any }): FormatContext;
+    /**
+     * Create a frame for encoding or filtering
+     * Set parameters as required from the Frame object
+     */
+    frame(options?: string | { [key: string]: any, data?: Array<Buffer> }): Frame
+
+    /** Format details for all supported pixel format names */
+    pix_fmts(): { [key: string]: PixelFormat }
+    /** Format details for all supported sample format names */
+    sample_fmts(): { [key: string]: SampleFormat }
+    /**
+     * Note that when creating buffers from Javascript,
+     * FFmpeg recommends that a small amount of headroom is added to the minimum length of each buffer.
+     * The minimum amount of padding is exposed to Javascript as constant
+     */
+    AV_INPUT_BUFFER_PADDING_SIZE: number;
+
+    /**
+     * Create a muxer to write to a URL or filename
+     * @param options a MuxerCreateOptions object
+     * @returns A Muxer object
+     */
+    muxer(options: MuxerCreateOptions): Muxer
+
+
+    /**
+     * Provides a list and details of all the available muxer output formats
+     * @returns an object with details of all the available muxer output formats
+     */
+    muxers(): { [key: string]: OutputFormat }
+
+
+    /**
+ * Provides a list and details of all the available filters
+ * @returns an object with name and details of each of the available filters
+ */
+    filters(): { [key: string]: Filter }
+
+    /** List the available bitstream filters */
+    bsfs(): {
+        [key: string]: {
+            name: string
+            codec_ids: Array<string>
+            priv_class: PrivClass | null
+        }
+    }
+
+    /**
+ * Create a ReadableMuxerStream to allow streaming from a Muxer
+ * @param options.highwaterMark The maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource.
+ * @returns A ReadableMuxerStream that can be streamed from.
+ */
+    muxerStream(options: { highwaterMark?: number }): ReadableMuxerStream
+    /**
+     * Initialise the sources for the beamstream process.
+     * Note - the params object is updated by the function.
+     */
+    makeSources(params: BeamstreamParams): Promise<void>
+    /**
+     * Initialise the output streams for the beamstream process.
+     * Note - the params object is updated by the function.
+     * @returns Promise which resolves to an object with a run function that starts the processing
+     */
+    makeStreams(params: BeamstreamParams): Promise<{ run(): Promise<void> }>
+    /**
+    * Create a WritableDemuxerStream to allow streaming to a Demuxer
+    * @param options.highwaterMark Buffer level when `stream.write()` starts returng false.
+    * @returns A WritableDemuxerStream that can be streamed to.
+    */
+    demuxerStream(options: { highwaterMark?: number }): WritableDemuxerStream
+
+    codecParameters(options?: string | Partial<Omit<CodecPar, 'type' | '_codecPar' | 'toJSON'>>): CodecPar;
+    // { [key: string]: any }
+
+    /**
+     * Create a filterer
+     * @param options parameters to set up the type, inputs, outputs and spec of the filter
+     * @returns Promise that resolve to a Filterer on success
+     */
+    filterer(options: FiltererVideoOptions | FiltererAudioOptions): Promise<Filterer>
+
+
+    AV_NOPTS_VALUE: number
+
+    /** The LIBAV**_VERSION_INT for each FFmpeg library */
+    versions(): {
+      avcodec: number
+      avdevice: number
+      avfilter: number
+      avformat: number
+      avutil: number
+      postproc: number
+      swresample: number
+      swscale: number
+    }
+    /**
+     * FFmpeg version string. This usually is the actual release
+     * version number or a git commit description. This string has no fixed format
+     * and can change any time. It should never be parsed by code.
+     */
+    avVersionInfo(): string
+    /** Informative version strings for each FFmpeg library */
+    versionStrings(): {
+      avcodec: string
+      avdevice: string
+      avfilter: string
+      avformat: string
+      avutil: string
+      postproc: string
+      swresample: string
+      swscale: string
+    }
+    /** Build configuration strings for each FFmpeg library */
+    configurations(): {
+      avcodec: string
+      avdevice: string
+      avfilter: string
+      avformat: string
+      avutil: string
+      postproc: string
+      swresample: string
+      swscale: string
+    }
+    /** License strings for each FFmpeg library */
+    licenses(): {
+      avcodec: string
+      avdevice: string
+      avfilter: string
+      avformat: string
+      avutil: string
+      postproc: string
+      swresample: string
+      swscale: string
+    }
+    /** List the available protocols */
+    protocols(): { inputs: Array<string>, outputs: Array<string> }
+    
+    /** Read or set the logging level
+     * `quiet` - print no output.
+     * `panic` - something went really wrong - crash will follow
+     * `fatal` - recovery not possible
+     * `error` - lossless recovery not possible
+     * `warning` - something doesn't look correct
+     * `info` - standard information - the default
+     * `verbose` - detailed information
+     * `debug` - stuff which is only useful for libav* developers
+     * `trace` - extremely verbose debugging for libav* developers
+     */
+    logging(level?: string): string | undefined
+}
+
diff --git a/ts/types/Beamstreams.d.ts b/ts/types/Beamstreams.d.ts
new file mode 100644
index 0000000..9fa71c9
--- /dev/null
+++ b/ts/types/Beamstreams.d.ts
@@ -0,0 +1,56 @@
+import { Demuxer, DemuxerCreateOptions } from "./Demuxer"
+import { Muxer, MuxerCreateOptions } from "./Muxer"
+import { InputFormat } from "./FormatContext"
+
+/** Source definition for a beamstream channel, from either a file or NodeJS ReadableStream */
+export interface BeamstreamSource {
+	url?: string
+	input_stream?: NodeJS.ReadableStream
+	ms?: { start: number, end: number }
+	streamIndex?: number
+	iformat?: InputFormat
+    options?: { [key: string]: any }
+
+	format?: Demuxer; // filled by makeSources
+	stream?: Readable; // filled by makeSources
+	decoder?: Decoder; // FIXME
+}
+/** Codec definition for the destination channel */
+export interface BeamstreamStream {
+	name: string
+	time_base: Array<number>
+	codecpar: { [key: string]: any }
+
+	encoder?: Encoder; 	// filled by runStreams
+	stream?: Stream;	// filled by runStreams
+
+}
+/** Definition for a channel of beamstream processing */
+export interface BeamstreamChannel {
+	sources: Array<BeamstreamSource>
+	filterSpec: string
+	streams: Array<BeamstreamStream>
+	filter?: Filterer; // filled by makeStreams
+}
+/**
+ * Definition for a beamstream process consisting of a number of audio and video sources
+ * that are to be processed and multiplexed into an output file or stream
+ */
+export interface BeamstreamParams {
+	video?: Array<BeamstreamChannel>
+	audio?: Array<BeamstreamChannel>
+  /** Destination definition for the beamstream process, to either a file or NodeJS WritableStream */
+  out: {
+		formatName: string
+		url?: string
+		output_stream?: NodeJS.WritableStream
+		flags?: {
+			READ?: boolean
+			WRITE?: boolean
+			NONBLOCK?: boolean
+			DIRECT?: boolean
+		}
+		options?: { [key:string]: any }
+	}
+}
+
diff --git a/types/Codec.d.ts b/ts/types/Codec.d.ts
similarity index 100%
rename from types/Codec.d.ts
rename to ts/types/Codec.d.ts
diff --git a/types/CodecContext.d.ts b/ts/types/CodecContext.d.ts
similarity index 99%
rename from types/CodecContext.d.ts
rename to ts/types/CodecContext.d.ts
index 5f90969..1e483ac 100644
--- a/types/CodecContext.d.ts
+++ b/ts/types/CodecContext.d.ts
@@ -65,7 +65,7 @@ export interface CodecContext {
 	 * vop_time_increment_resolution and fixed_vop_rate
 	 * (fixed_vop_rate == 0 implies that it is different from the framerate)
    */
-	time_base: Array<number>
+	time_base: [number, number]
 	/**
 	 * For some codecs, the time base is closer to the field rate than the frame rate.
 	 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
@@ -407,7 +407,7 @@ export interface CodecContext {
    * For codecs that store a framerate value in the compressed
    * bitstream, the decoder may export it here. [ 0, 1 ] when unknown.
 	 */
-	framerate: Array<number>
+	framerate: [number, number]
   /** Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx. */
 	readonly sw_pix_fmt: string | null
   /** Timebase in which pkt_dts/pts and Packet dts/pts are. */
@@ -552,4 +552,6 @@ export interface CodecContext {
 		* used as reference pictures).
 		*/
 	extra_hw_frames: number
+	// private field
+	readonly _CodecContext: {};
 }
diff --git a/types/CodecPar.d.ts b/ts/types/CodecPar.d.ts
similarity index 91%
rename from types/CodecPar.d.ts
rename to ts/types/CodecPar.d.ts
index 6f06836..1389b75 100644
--- a/types/CodecPar.d.ts
+++ b/ts/types/CodecPar.d.ts
@@ -1,7 +1,9 @@
+import { toJSONAble } from "./time"
+
 /**
  * CodecPar describes the properties of an encoded stream.
  */
-export interface CodecPar {
+export interface CodecPar extends toJSONAble {
 	/** Object name. */
   readonly type: 'CodecParameters'
 	/** General type of the encoded data. */
@@ -101,8 +103,10 @@ export interface CodecPar {
 	trailing_padding: number
 	/** Audio only. Number of samples to skip after a discontinuity. */
 	seek_preroll: number
-	/** Retun a JSON string containing the object properties. */
-	toJSON(): string
+	// native code;
+	readonly _codecPar: {};
+
 }
 
-export function codecParameters(options?: { [key: string]: any }): CodecPar;
+export function codecParameters(options?: string | { [key: string]: any }): CodecPar;
+//                             (options?: string | Partial<Omit<CodecPar, 'type' | '_codecPar' | 'toJSON'>>)
\ No newline at end of file
diff --git a/ts/types/DecodedFrames.d.ts b/ts/types/DecodedFrames.d.ts
new file mode 100644
index 0000000..0d15c3b
--- /dev/null
+++ b/ts/types/DecodedFrames.d.ts
@@ -0,0 +1,16 @@
+import { Frame } from "./Frame"
+import { Timable, TotalTimed } from "./time"
+
+/** The DecodedFrames object is returned as the result of a decode operation */
+export interface DecodedFrames extends Timable, TotalTimed {
+	/** Object name. */
+	readonly type: 'frames'
+	/** 
+	   * Decoded frames that are now available. If the array is empty, the decoder has buffered
+	 * the packet as part of the process of producing future frames
+	   */
+	readonly frames: Array<Frame>
+
+	// "encode" | "dice" | "decode" | "filter"
+	// timings?: { [key: string]: Timing; };
+}
diff --git a/types/Decoder.d.ts b/ts/types/Decoder.d.ts
similarity index 97%
rename from types/Decoder.d.ts
rename to ts/types/Decoder.d.ts
index 488cb72..dd33bde 100644
--- a/types/Decoder.d.ts
+++ b/ts/types/Decoder.d.ts
@@ -4,9 +4,10 @@ import { Frame } from "./Frame"
 import { Codec } from "./Codec"
 import { CodecContext } from "./CodecContext"
 import { Demuxer } from "./Demuxer"
+import { Timable, TotalTimed } from "./time"
 
 /** The DecodedFrames object is returned as the result of a decode operation */
-export interface DecodedFrames {
+export interface DecodedFrames extends Timable, TotalTimed {
 	/** Object name. */
 	readonly type: 'frames'
   /** 
@@ -15,7 +16,7 @@ export interface DecodedFrames {
 	 */
 	readonly frames: Array<Frame>
 	/** Total time in microseconds that the decode operation took to complete */
-	readonly total_time: number
+	// readonly total_time: number
 }
 
 export interface Decoder extends Omit<CodecContext,
@@ -99,6 +100,8 @@ export interface Decoder extends Omit<CodecContext,
 	 * @returns the modified Decoder object
    */
 	useParams(params: CodecPar): Decoder
+	// private field
+	readonly _CodecContext: {}
 }
 
 /**
diff --git a/types/Demuxer.d.ts b/ts/types/Demuxer.d.ts
similarity index 93%
rename from types/Demuxer.d.ts
rename to ts/types/Demuxer.d.ts
index 6bcb223..7eb3b17 100644
--- a/types/Demuxer.d.ts
+++ b/ts/types/Demuxer.d.ts
@@ -91,7 +91,12 @@ export function demuxers(): { [key: string]: InputFormat }
  * format details by consuming data from the source. The promise will wait indefinitely 
  * until sufficient source data has been read.
  */
-export function demuxer(url: string): Promise<Demuxer>
+ // this code look to have error....
+ // duplicate governor splot
+ // TODO FIX ME
+ export function demuxer(options: { governor?: Governor, url?: string, iformat?: InputFormat, options?: { governor: Governor } } | string): Promise<Demuxer>
+//export function demuxer(url: string): Promise<Demuxer>
+
 
 /** Object to provide additional metadata on Demuxer creation */
 export interface DemuxerCreateOptions {
diff --git a/types/Encoder.d.ts b/ts/types/Encoder.d.ts
similarity index 91%
rename from types/Encoder.d.ts
rename to ts/types/Encoder.d.ts
index 35d5f74..cf6c912 100644
--- a/types/Encoder.d.ts
+++ b/ts/types/Encoder.d.ts
@@ -3,9 +3,10 @@ import { Packet } from "./Packet";
 import { Frame } from "./Frame";
 import { Codec } from "./Codec"
 import { CodecContext } from "./CodecContext"
+import { Timable, TotalTimed } from "./time";
 
 /** The EncodedPackets object is returned as the result of a encode operation */
-export interface EncodedPackets {
+export interface EncodedPackets extends Timable, TotalTimed {
 	/** Object name. */
 	readonly type: 'packets'
   /** 
@@ -84,11 +85,12 @@ export function encoders(): { [key: string]: Codec }
  * @param ... Any non-readonly parameters from the Encoder object as required
  * @returns An Encoder object - note creation is synchronous
  */
-export function encoder(options: { name: string, [key: string]: any }): Encoder
+// export function encoder(options: { name: string, [key: string]: any }): Encoder
+export function encoder(options: { name: string } & Partial<Omit<CodecContext, 'codec_id'>>): Encoder
 /**
  * Create an encoder by codec_id
  * @param codec_id The codec ID from AV_CODEC_ID_xxx
  * @param ... Any non-readonly parameters from the Encoder object as required
  * @returns An Encoder object - note creation is synchronous
  */
-export function encoder(options: { codec_id: number, [key: string]: any }): Encoder
+export function encoder(options: { codec_id: number } & Partial<Omit<CodecContext, 'name'>>): Encoder
diff --git a/types/Filter.d.ts b/ts/types/Filter.d.ts
similarity index 96%
rename from types/Filter.d.ts
rename to ts/types/Filter.d.ts
index 13d56d6..9544f2b 100644
--- a/types/Filter.d.ts
+++ b/ts/types/Filter.d.ts
@@ -1,5 +1,6 @@
 import { Frame } from "./Frame"
 import { PrivClass } from "./PrivClass"
+import { Timable } from "./time"
 
 export interface Filter {
 	readonly type: 'Filter'
@@ -95,7 +96,7 @@ export interface FilterLink {
 	/** video only - agreed upon image height */
 	readonly h?: number
 	/** video only - agreed upon sample aspect ratio */
-	readonly sample_aspect_ratio?: ReadonlyArray<number>
+	readonly sample_aspect_ratio?: [number, number]; // ReadonlyArray<number>
 	/** audio only - number of channels in the channel layout. */
 	readonly channel_count?: number
 	/** audio only - channel layout of current buffer */
@@ -210,7 +211,7 @@ export interface FiltererResult {
 	readonly frames: Array<Frame>
 }
 
-export interface Filterer {
+export interface Filterer extends Timable {
 	readonly type: 'Filterer'
 	readonly graph: FilterGraph
 
@@ -222,7 +223,7 @@ export interface Filterer {
 	 * @param frames Array of Frame objects to be applied to the single input pad
 	 * @returns Array of objects containing Frame arrays for each output pad of the filter
 	 */
-	filter(frames: Array<Frame>): Promise<Array<FiltererResult> & { total_time: number }>
+	filter(frames: Array<Frame>): Promise<Array<FiltererResult> & TotalTimed>
   /**
 	 * Filter an array of frames
 	 * Pass an array of objects, one per filter input, each with a name string property
@@ -231,7 +232,11 @@ export interface Filterer {
 	 * @param framesArr Array of objects with name and Frame array for each input pad
 	 * @returns Array of objects containing Frame arrays for each output pad of the filter
    */
-	filter(framesArr: Array<{ name: string, frames: Array<Frame> }>): Promise<Array<FiltererResult> & { total_time: number }>
+	filter(framesArr: Array<{ name?: string, frames: Array<Frame> }>): Promise<Array<FiltererResult> & { total_time: number }>
+	
+	// may add a callback
+	cb?: (pts: number | null) => void;
+
 }
 
 /**
diff --git a/types/FormatContext.d.ts b/ts/types/FormatContext.d.ts
similarity index 97%
rename from types/FormatContext.d.ts
rename to ts/types/FormatContext.d.ts
index eeac3a8..2ced8a8 100644
--- a/types/FormatContext.d.ts
+++ b/ts/types/FormatContext.d.ts
@@ -131,10 +131,14 @@ export function guessFormat(name: string): OutputFormat | null;
 export interface FormatContext {
 	/** Object name. */
 	readonly type: string
-	/** The input format description. */
-	iformat: InputFormat
+    /** The input format description. */
+    set iformat(format: string);
+    //@ts-ignore
+    get iformat(): InputFormat
 	/** The output format description. */
-	oformat: OutputFormat
+	set oformat(format: string);
+	// @ts-ignore
+	get oformat(): OutputFormat
 	/** Format private data. */
 	priv_data: {
 		[key: string]: any
@@ -366,7 +370,7 @@ export interface FormatContext {
 	 * to be initialised in the Stream object
 	 * @returns A Stream object
 	 */
-	newStream(options: { name: string, [key: string]: any	}): Stream
+	newStream(options: stinrg | { name: string, [key: string]: any	}): Stream
   /**
 	 * Add a stream to the format with the next available stream index.
 	 * @param stream Source stream from which to copy the parameters for the new stream
@@ -377,4 +381,4 @@ export interface FormatContext {
   toJSON(): string
 }
 
-export function format(options: { [key: string]: any }): FormatContext
+export function format(options?: string | { [key: string]: any }): FormatContext
diff --git a/ts/types/FormatContextIn.d.ts b/ts/types/FormatContextIn.d.ts
new file mode 100644
index 0000000..4f540f9
--- /dev/null
+++ b/ts/types/FormatContextIn.d.ts
@@ -0,0 +1,93 @@
+export interface FormatContextIn {
+    /** The input format description. */
+    set iformat(format: string);
+    //@ts-ignore
+    get iformat(): InputFormat
+    /**
+     * Position of the first frame of the component, in
+     * AV_TIME_BASE fractional seconds. NEVER set this value directly:
+     * It is deduced from the AVStream values. Demuxing only
+     */
+    readonly start_time: number
+    /** Maximum size of the data read from input for determining the input container format. */
+    probesize: number
+    /**
+ * Maximum duration (in AV_TIME_BASE units) of the data read
+ * from input in avformat_find_stream_info().
+ * Demuxing only, set by the caller before avformat_find_stream_info().
+ * Can be set to 0 to let avformat choose using a heuristic.
+ */
+    max_analyze_duration: number
+
+    /**
+* Maximum amount of memory in bytes to use for the index of each stream.
+* If the index exceeds this size, entries will be discarded as
+* needed to maintain a smaller size. This can lead to slower or less
+* accurate seeking (depends on demuxer).
+* Demuxers for which a full in-memory index is mandatory will ignore
+* this.
+*/
+    max_index_size: number
+    /** The number of frames used for determining the framerate */
+    fps_probe_size: number
+    /**
+     * Error recognition - higher values will detect more errors but may
+     * misdetect some more or less valid parts as errors.
+     */
+    error_recognition: number
+
+    /** Maximum number of packets to read while waiting for the first timestamp. */
+    max_ts_probe: number
+
+    /**
+ * forces the use of wallclock timestamps as pts/dts of packets
+ * This has undefined results in the presence of B frames.
+ */
+    use_wallclock_as_timestamps: boolean
+    /** avio flags, used to force AVIO_FLAG_DIRECT. */
+    avio_flags: {
+        READ?: boolean
+        WRITE?: boolean
+        NONBLOCK?: boolean
+        DIRECT?: boolean
+    }
+    /**
+   * The duration field can be estimated through various ways, and this field can be used
+   * to know how the duration was estimated.
+   */
+    readonly duration_estimation_method: 'from_pts' | 'from_stream' | 'from_bitrate'
+    /** Skip initial bytes when opening stream */
+    skip_initial_bytes: number
+    /** Correct single timestamp overflows */
+    correct_ts_overflow: boolean
+    /** Force seeking to any (also non key) frames. */
+    seek2any: boolean
+    /**
+     * format probing score.
+     * The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
+     * the format.
+     */
+    readonly probe_score: number
+    /** number of bytes to read maximally to identify format. */
+    format_probesize: number
+    /**
+     * ',' separated list of allowed decoders.
+     * If NULL then all are allowed
+     */
+    codec_whitelist: string | null
+    /**
+     * ',' separated list of allowed demuxers.
+     * If NULL then all are allowed
+     */
+    format_whitelist: string | null
+    /** ',' separated list of allowed protocols. */
+    protocol_whitelist: string
+    /** ',' separated list of disallowed protocols. */
+    protocol_blacklist: string
+    /** The maximum number of streams. */
+    max_streams: number
+    /** Skip duration calcuation in estimate_timings_from_pts. */
+    skip_estimate_duration_from_pts: boolean
+    // interleaved: true,
+
+}
diff --git a/ts/types/FormatContextOut.d.ts b/ts/types/FormatContextOut.d.ts
new file mode 100644
index 0000000..7dc9ace
--- /dev/null
+++ b/ts/types/FormatContextOut.d.ts
@@ -0,0 +1,42 @@
+export interface FormatContextOut {
+	/** The output format description. */
+	set oformat(format: string);
+	// @ts-ignore
+	get oformat(): OutputFormat
+	/**
+	 * Maximum buffering duration for interleaving.
+	 *
+	 * To ensure all the streams are interleaved correctly,
+	 * av_interleaved_write_frame() will wait until it has at least one packet
+	 * for each stream before actually writing any packets to the output file.
+	 * When some streams are "sparse" (i.e. there are large gaps between
+	 * successive packets), this can result in excessive buffering.
+	 *
+	 * This field specifies the maximum difference between the timestamps of the
+	 * first and the last packet in the muxing queue, above which libavformat
+	 * will output a packet regardless of whether it has queued a packet for all
+	 * the streams.
+	 *
+	 * Muxing only, set by the caller before avformat_write_header().
+	 */
+	max_interleave_delta: number
+	/**
+	   * Avoid negative timestamps during muxing. Any value of the AVFMT_AVOID_NEG_TS_* constants.
+	   * Note, this only works when using av_interleaved_write_frame. (interleave_packet_per_dts is in use)
+	   */
+	avoid_negative_ts: 'auto' | 'make_non_negative' | 'make_zero'
+	/** Audio preload in microseconds. Note, not all formats support this and unpredictable things may happen if it is used when not supported. */
+	audio_preload: number
+	/** Max chunk time in microseconds. Note, not all formats support this and unpredictable things may happen if it is used when not supported. */
+	max_chunk_duration: number
+	/** Max chunk size in bytes Note, not all formats support this and unpredictable things may happen if it is used when not supported. */
+	max_chunk_size: number
+	/** Flush the I/O context after each packet. */
+	flush_packets: number
+	/** Number of bytes to be written as padding in a metadata header. */
+	metadata_header_padding: number
+	// not exposing opaque
+	/** Output timestamp offset, in microseconds. */
+	// may need to be remove ??
+	output_ts_offset: number
+}
diff --git a/types/Frame.d.ts b/ts/types/Frame.d.ts
similarity index 98%
rename from types/Frame.d.ts
rename to ts/types/Frame.d.ts
index 5dac86c..525f8a8 100644
--- a/types/Frame.d.ts
+++ b/ts/types/Frame.d.ts
@@ -1,9 +1,10 @@
 import { HWFramesContext } from "./HWContext";
+import { Timable, toJSONAble } from "./time";
 
 /**
  * This object describes decoded (raw) audio or video data.
  */
-export interface Frame {
+export interface Frame extends Timable, toJSONAble {
 	/** Object name. */
 	readonly type: 'Frame'
 	/**
@@ -181,7 +182,7 @@ export interface Frame {
  * Create a frame for encoding or filtering
  * Set parameters as required from the Frame object
  */
-export function frame(options: { [key: string]: any, data?: Array<Buffer> }): Frame
+export function frame(options?: { [key: string]: any, data?: Array<Buffer> } | string): Frame
 
 /** Pixel format description */
 export interface PixelFormat {
diff --git a/ts/types/Governor.d.ts b/ts/types/Governor.d.ts
new file mode 100644
index 0000000..8d3d8bb
--- /dev/null
+++ b/ts/types/Governor.d.ts
@@ -0,0 +1,12 @@
+/**
+ * Create object for AVIOContext based buffered I/O
+ * 
+ * Type only definition for Governor class
+ */
+ export class governor {
+    constructor(options: { highWaterMark?: number });
+    read(len: number): Promise<Buffer>
+    write(data: Buffer): Promise<null>
+    finish(): undefined
+    private _adaptor: unknown;
+}
diff --git a/types/HWContext.d.ts b/ts/types/HWContext.d.ts
similarity index 100%
rename from types/HWContext.d.ts
rename to ts/types/HWContext.d.ts
diff --git a/types/Muxer.d.ts b/ts/types/Muxer.d.ts
similarity index 98%
rename from types/Muxer.d.ts
rename to ts/types/Muxer.d.ts
index fed21bf..87b8ce5 100644
--- a/types/Muxer.d.ts
+++ b/ts/types/Muxer.d.ts
@@ -31,10 +31,10 @@ export interface Muxer extends Omit<FormatContext,
 		filename?: string
 		options?: { [key: string]: any }
 		flags?: {
-			READ: boolean
-			WRITE: boolean
-			NONBLOCK: boolean
-			DIRECT: boolean
+			READ?: boolean
+			WRITE?: boolean
+			NONBLOCK?: boolean
+			DIRECT?: boolean
 		}
 	}): Promise<undefined | { unset: {[key: string]: any}}>
 
diff --git a/types/Packet.d.ts b/ts/types/Packet.d.ts
similarity index 91%
rename from types/Packet.d.ts
rename to ts/types/Packet.d.ts
index 1e043ce..2d0e9da 100644
--- a/types/Packet.d.ts
+++ b/ts/types/Packet.d.ts
@@ -1,3 +1,5 @@
+import { Timable, toJSONAble } from "./time"
+
 /**
  * This object stores compressed data. It is typically exported by demuxers
  * and then passed as input to decoders, or received as output from encoders and
@@ -8,9 +10,12 @@
  * packets, with no compressed data, containing only side data
  * (e.g. to update some stream parameters at the end of encoding).
  */
-export interface Packet {
+export interface Packet extends Timable, toJSONAble {
 	/** Object name. */
 	readonly type: 'Packet'
+	// internal data
+	readonly _packet: {};
+
 	/**
 	 * Presentation timestamp in AVStream->time_base units the time at which
 	 * the decompressed packet will be presented to the user.
@@ -47,7 +52,7 @@ export interface Packet {
 		 * decoder state but are not required for output and should be dropped
 		 * after decoding.
 		 **/
-    DISCARD: boolean
+        DISCARD: boolean
 		/**
 		 * The packet comes from a trusted source.
 		 *
@@ -79,4 +84,4 @@ export interface Packet {
  * Packets for decoding can be created without reading them from a demuxer
  * Set parameters as required from the Packet object, passing in a buffer and the required size in bytes
  */
-export function packet(options: { [key: string]: any, data: Buffer, size: number }): Packet
+export function packet(options?:string | { [key: string]: any, data: Buffer, size: number }): Packet
diff --git a/types/PrivClass.d.ts b/ts/types/PrivClass.d.ts
similarity index 100%
rename from types/PrivClass.d.ts
rename to ts/types/PrivClass.d.ts
diff --git a/types/Stream.d.ts b/ts/types/Stream.d.ts
similarity index 97%
rename from types/Stream.d.ts
rename to ts/types/Stream.d.ts
index feb8da0..b5a77ad 100644
--- a/types/Stream.d.ts
+++ b/ts/types/Stream.d.ts
@@ -1,5 +1,6 @@
 import { CodecPar } from "./CodecPar";
 import { Packet } from "./Packet"
+import { toJSONAble } from "./time";
 
 export interface Disposition {
 	DEFAULT?: boolean
@@ -50,7 +51,9 @@ export interface EventFlags {
 /**
  * Stream describes the properties of a stream.
  */
-export interface Stream {
+export interface Stream extends toJSONAble {
+  // native code;
+  readonly _stream: {};
 	/** Object name. */
   readonly type: 'Stream'
 	/** The stream index in the container. */
@@ -73,7 +76,7 @@ export interface Stream {
    *           written into the file (which may or may not be related to the
    *           user-provided one, depending on the format).
    */
-  time_base: Array<number>
+  time_base: [ number, number ]
   /**
    * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
    * Only set this if you are absolutely 100% sure that the value you set
@@ -159,7 +162,4 @@ export interface Stream {
    * - muxing: filled by the caller before writeHeader()
    */
   codecpar: CodecPar
-
-  /** Retun a JSON string containing the object properties. */
-  toJSON(): string
 }
diff --git a/index.d.ts b/ts/types/index.d.ts
similarity index 80%
rename from index.d.ts
rename to ts/types/index.d.ts
index a52bcf1..3a0543d 100644
--- a/index.d.ts
+++ b/ts/types/index.d.ts
@@ -1,16 +1,19 @@
-export * from "./types/CodecPar"
-export * from "./types/Packet"
-export * from "./types/Frame"
-export * from "./types/Stream"
-export * from "./types/Codec"
-export * from "./types/FormatContext"
-export * from "./types/Demuxer"
-export * from "./types/Decoder"
-export * from "./types/Filter"
-export * from "./types/Encoder"
-export * from "./types/Muxer"
-export * from "./types/Beamstreams"
-export * from "./types/HWContext"
+export * from "./Beamstreams"
+export * from "./Codec"
+export * from "./CodecContext"
+export * from "./CodecPar"
+export * from "./Decoder"
+export * from "./Demuxer"
+export * from "./Encoder"
+export * from "./Filter"
+export * from "./FormatContext"
+export * from "./Frame"
+export * from "./governor"
+export * from "./HWContext"
+export * from "./Muxer"
+export * from "./Packet"
+export * from "./PrivClass"
+export * from "./Stream"
 
 export const AV_NOPTS_VALUE: number
 
@@ -80,4 +83,4 @@ export function protocols(): { inputs: Array<string>, outputs: Array<string> }
  */
 export function logging(level?: string): string | undefined
 
-export as namespace Beamcoder
+// export as namespace Beamcoder
diff --git a/ts/types/params.d.ts b/ts/types/params.d.ts
new file mode 100644
index 0000000..e75400a
--- /dev/null
+++ b/ts/types/params.d.ts
@@ -0,0 +1,18 @@
+export interface commonEncoderParms {
+    width?: number;
+    height?: number;
+    sample_rate?: number,
+    sample_fmt?: string,
+    sample_aspect_ratio?: ReadonlyArray<number>,
+    channels?: number;
+    bit_rate?: number;
+    channel_layout?: string;
+    time_base?: [number, number];
+    framerate?: [number, number];
+    gop_size?: number;
+    max_b_frames?: number;
+    pix_fmt?: string;// pixelFormat,
+    priv_data?: any; // { preset?: 'slow' };
+    flags?: any;
+    // [key: string]: any 
+}
diff --git a/ts/types/time.d.ts b/ts/types/time.d.ts
new file mode 100644
index 0000000..6cea04a
--- /dev/null
+++ b/ts/types/time.d.ts
@@ -0,0 +1,20 @@
+export interface Timing {
+    reqTime: number;
+    elapsed: number;
+}
+
+export interface TotalTimed {
+	/** Total time in microseconds that the decode operation took to complete */
+    total_time: number
+}
+
+export interface Timable {
+    timings?: { [key: string]: Timing; };
+}
+
+export interface toJSONAble {
+	/** Retun a JSON string containing the object properties. */
+	toJSON(): string
+}
+
+export type Timables<T> = Array<T> & Timable;
\ No newline at end of file
diff --git a/ts/utils.ts b/ts/utils.ts
new file mode 100644
index 0000000..fb1d996
--- /dev/null
+++ b/ts/utils.ts
@@ -0,0 +1,70 @@
+import https from 'https';
+
+/**
+ * @param ws writable stream to pipe datastream
+ * @param url url to download
+ * @param name name to display in screen
+ * @returns Promise
+ */
+export async function getRaw(ws: NodeJS.WritableStream, url: string, name?: string): Promise<void> {
+    let received = 0;
+    let totalLength = 0;
+    if (!name)
+        name = new URL(url).pathname.replace(/.*\//g, '')
+    return new Promise((comp, err) => {
+      let prevMsg = '';
+      https.get(url, res => {
+        if (res.statusCode === 301 || res.statusCode === 302) {
+          err({ name: 'RedirectError', message: res.headers.location });
+        } else {
+          res.pipe(ws);
+          if (totalLength == 0) {
+            totalLength = +(res.headers['content-length'] as string);
+          }
+          res.on('end', () => {
+            process.stdout.write(`Downloaded Done of '${name}'. Total length ${received} bytes.\n`);
+            comp();
+          });
+          res.on('error', err);
+          res.on('data', x => {
+            received += x.length;
+            const msg = `Downloaded ${received * 100 / totalLength | 0 }% of '${name}'.\r`;
+            if (msg !== prevMsg) {
+              prevMsg = msg;
+              process.stdout.write(msg);
+            }
+          });
+        }
+      }).on('error', err);
+    });
+  }
+  
+export async function getHTML(url: string, name: string): Promise<Buffer> {
+    let received = 0;
+    let totalLength = 0;
+    return new Promise((resolve, reject) => {
+      https.get(url, res => {
+        let prevMsg = '';
+        const chunks: Array<Uint8Array> = [];
+        if (totalLength == 0) {
+          totalLength = +(res.headers['content-length'] as string);
+        }
+        res.on('end', () => {
+          process.stdout.write(`Downloaded Done of '${name}'. Total length ${received} bytes.\n`);
+          resolve(Buffer.concat(chunks));
+        });
+        res.on('error', reject);
+        res.on('data', (chunk) => {
+          chunks.push(chunk);
+          received += chunk.length;
+          const msg = `Downloaded ${received * 100 / totalLength | 0 }% of '${name}'.\r`;
+          if (msg !== prevMsg) {
+            prevMsg = msg;
+            process.stdout.write(msg);
+          }
+        });
+      }).on('error', reject);
+    });
+  }
+  
+  
\ No newline at end of file
diff --git a/ts/writeStream.ts b/ts/writeStream.ts
new file mode 100644
index 0000000..65cf9ce
--- /dev/null
+++ b/ts/writeStream.ts
@@ -0,0 +1,82 @@
+/*
+  Aerostat Beam Coder - Node.js native bindings to FFmpeg
+  Copyright (C) 2019 Streampunk Media Ltd.
+  Copyright (C) 2022 Chemouni Uriel.
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+  https://www.streampunk.media/ mailto:furnace@streampunk.media
+  14 Ormiscaig, Aultbea, Achnasheen, IV22 2JJ  U.K.
+*/
+import { Writable } from 'stream';
+import type { ffStats } from './calcStats';
+import { Timing, Timable } from './types/time';
+
+import calcStats from './calcStats';
+
+const doTimings = false;
+const timings = [] as Array<{ [key: string]: Timing }>;
+
+export default function writeStream<T extends Timable, R>(params: { name: string, highWaterMark?: number }, processFn: (val: T) => Promise<R>, finalFn: () => Promise<R>, reject: (err: Error) => void) {
+  return new Writable({
+    objectMode: true,
+    highWaterMark: params.highWaterMark ? params.highWaterMark || 4 : 4,
+    write(val: T, encoding: BufferEncoding, cb: (error?: Error | null, result?: R) => void) {
+      (async () => {
+        const start = process.hrtime();
+        const reqTime = start[0] * 1e3 + start[1] / 1e6;
+        const result = await processFn(val);
+        if ('mux' === params.name) {
+          const pktTimings = val.timings;
+          if (pktTimings) {
+            pktTimings[params.name] = { reqTime: reqTime, elapsed: process.hrtime(start)[1] / 1000000 };
+            if (doTimings)
+              timings.push(pktTimings);
+          }
+        }
+        cb(null, result);
+      })().catch(cb);
+    },
+    final(cb: (error?: Error | null, result?: R | null) => void) {
+      (async () => {
+        const result = finalFn ? await finalFn() : null;
+        if (doTimings && ('mux' === params.name)) {
+          const elapsedStats = {} as { [key: string]: ffStats };
+          Object.keys(timings[0]).forEach(k => elapsedStats[k] = calcStats<typeof k, 'elapsed'>(timings.slice(10, -10), k, 'elapsed'));
+          console.log('elapsed:');
+          console.table(elapsedStats);
+
+          const absArr = timings.map(t => {
+            const absDelays = {} as { [key: string]: { reqDelta: number } };
+            const keys = Object.keys(t);
+            keys.forEach((k, i) => absDelays[k] = { reqDelta: i > 0 ? t[k].reqTime - t[keys[i - 1]].reqTime : 0 });
+            return absDelays;
+          });
+          const absStats = {} as { [key: string]: ffStats };
+          Object.keys(absArr[0]).forEach(k => absStats[k] = calcStats<typeof k, 'reqDelta'>(absArr.slice(10, -10), k, 'reqDelta'));
+          console.log('request time delta:');
+          console.table(absStats);
+
+          const totalsArr = timings.map(t => {
+            const total = (t.mux && t.read) ? t.mux.reqTime - t.read.reqTime + t.mux.elapsed : 0;
+            return { total: { total: total } };
+          });
+          console.log('total time:');
+          console.table(calcStats<'total', 'total'>(totalsArr.slice(10, -10), 'total', 'total'));
+        }
+        cb(null, result);
+      })().catch(cb);
+    }
+  }).on('error', err => reject(err));
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..46a1b4a
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,103 @@
+{
+    "compilerOptions": {
+      /* Visit https://aka.ms/tsconfig.json to read more about this file */
+  
+      /* Projects */
+      // "incremental": true,                              /* Enable incremental compilation */
+      // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+      // "tsBuildInfoFile": "./",                          /* Specify the folder for .tsbuildinfo incremental compilation files. */
+      // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects */
+      // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+      // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+  
+      /* Language and Environment */
+      "target": "ESNext",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
+      // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+      // "jsx": "preserve",                                /* Specify what JSX code is generated. */
+      // "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */
+      // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+      // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h' */
+      // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+      // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using `jsx: react-jsx*`.` */
+      // "reactNamespace": "",                             /* Specify the object invoked for `createElement`. This only applies when targeting `react` JSX emit. */
+      // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+      // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+  
+      /* Modules */
+      "module": "commonjs",                                /* Specify what module code is generated. */
+      // "rootDir": "./",                                  /* Specify the root folder within your source files. */
+      // "moduleResolution": "node",                       /* Specify how TypeScript looks up a file from a given module specifier. */
+      // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+      // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+      // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+      // "typeRoots": [],                                  /* Specify multiple folders that act like `./node_modules/@types`. */
+      // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
+      // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+      // "resolveJsonModule": true,                        /* Enable importing .json files */
+      // "noResolve": true,                                /* Disallow `import`s, `require`s or `<reference>`s from expanding the number of files TypeScript should add to a project. */
+  
+      /* JavaScript Support */
+      // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */
+      // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+      // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from `node_modules`. Only applicable with `allowJs`. */
+  
+      /* Emit */
+      "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+      // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+      // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+      // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+      // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If `declaration` is true, also designates a file that bundles all .d.ts output. */
+      // "outDir": "./",                                   /* Specify an output folder for all emitted files. */
+      // "removeComments": true,                           /* Disable emitting comments. */
+      // "noEmit": true,                                   /* Disable emitting files from a compilation. */
+      // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+      // "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types */
+      // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+      // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+      // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+      // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+      // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+      // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+      // "newLine": "crlf",                                /* Set the newline character for emitting files. */
+      // "stripInternal": true,                            /* Disable emitting declarations that have `@internal` in their JSDoc comments. */
+      // "noEmitHelpers": true,                            /* Disable generating custom helper functions like `__extends` in compiled output. */
+      // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+      // "preserveConstEnums": true,                       /* Disable erasing `const enum` declarations in generated code. */
+      // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+      // "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
+  
+      /* Interop Constraints */
+      // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+      // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
+      "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
+      // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+      "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
+  
+      /* Type Checking */
+      "strict": false,                                     /* Enable all strict type-checking options. */
+      "noImplicitAny": true,                               /* Enable error reporting for expressions and declarations with an implied `any` type.. */
+      // "strictNullChecks": true,                         /* When type checking, take into account `null` and `undefined`. */
+      // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+      // "strictBindCallApply": true,                      /* Check that the arguments for `bind`, `call`, and `apply` methods match the original function. */
+      // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+      // "noImplicitThis": true,                           /* Enable error reporting when `this` is given the type `any`. */
+      // "useUnknownInCatchVariables": true,               /* Type catch clause variables as 'unknown' instead of 'any'. */
+      // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+      // "noUnusedLocals": true,                           /* Enable error reporting when a local variables aren't read. */
+      // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read */
+      // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+      // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+      // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+      // "noUncheckedIndexedAccess": true,                 /* Include 'undefined' in index signature results */
+      // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+      // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type */
+      // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+      // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+  
+      /* Completeness */
+      // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+      "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
+    },
+    "include": ["ts/*.ts"],
+  }
+  
\ No newline at end of file
diff --git a/types/Beamstreams.d.ts b/types/Beamstreams.d.ts
deleted file mode 100644
index 0a5bd6d..0000000
--- a/types/Beamstreams.d.ts
+++ /dev/null
@@ -1,98 +0,0 @@
-import { Demuxer, DemuxerCreateOptions } from "./Demuxer"
-import { Muxer, MuxerCreateOptions } from "./Muxer"
-import { InputFormat } from "./FormatContext"
-
-/**
- * A [Node.js Writable stream](https://nodejs.org/docs/latest-v12.x/api/stream.html#stream_writable_streams)
- * allowing source data to be streamed to the demuxer from a file or other stream source such as a network connection
- */
-export interface WritableDemuxerStream extends NodeJS.WritableStream {
-	/**
-	 * Create a demuxer for this source
-	 * @param options a DemuxerCreateOptions object
-   * @returns a promise that resolves to a Demuxer when it has determined sufficient 
-	 * format details by consuming data from the source. The promise will wait indefinitely 
-	 * until sufficient source data has been read.
-	 */
-	demuxer(options: DemuxerCreateOptions): Promise<Demuxer>
-}
-/**
- * Create a WritableDemuxerStream to allow streaming to a Demuxer
- * @param options.highwaterMark Buffer level when `stream.write()` starts returng false.
- * @returns A WritableDemuxerStream that can be streamed to.
- */
-export function demuxerStream(options: { highwaterMark?: number }): WritableDemuxerStream
-
-/**
- * A [Node.js Readable stream](https://nodejs.org/docs/latest-v12.x/api/stream.html#stream_readable_streams)
- * allowing data to be streamed from the muxer to a file or other stream destination such as a network connection
- */
-export interface ReadableMuxerStream extends NodeJS.ReadableStream {
-	/**
-	 * Create a muxer for this source
-	 * @param options a MuxerCreateOptions object
-   * @returns A Muxer object
-	 */
-	muxer(options: MuxerCreateOptions): Muxer
-}
-/**
- * Create a ReadableMuxerStream to allow streaming from a Muxer
- * @param options.highwaterMark The maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource.
- * @returns A ReadableMuxerStream that can be streamed from.
- */
-export function muxerStream(options: { highwaterMark?: number }): ReadableMuxerStream
-
-/** Create object for AVIOContext based buffered I/O */
-export function governor(options: { highWaterMark: number }): {
-  read(len: number): Promise<Buffer>
-  write(data: Buffer): Promise<null>
-  finish(): undefined
-}
-
-/** Source definition for a beamstream channel, from either a file or NodeJS ReadableStream */
-export interface BeamstreamSource {
-	url?: string
-	input_stream?: NodeJS.ReadableStream
-	ms?: { start: number, end: number }
-	streamIndex?: number
-	iformat?: InputFormat
-  options?: { [key: string]: any }
-}
-/** Codec definition for the destination channel */
-export interface BeamstreamStream {
-	name: string
-	time_base: Array<number>
-	codecpar: { [key: string]: any }
-}
-/** Definition for a channel of beamstream processing */
-export interface BeamstreamChannel {
-	sources: Array<BeamstreamSource>
-	filterSpec: string
-	streams: Array<BeamstreamStream>
-}
-/**
- * Definition for a beamstream process consisting of a number of audio and video sources
- * that are to be processed and multiplexed into an output file or stream
- */
-export interface BeamstreamParams {
-	video?: Array<BeamstreamChannel>
-	audio?: Array<BeamstreamChannel>
-  /** Destination definition for the beamstream process, to either a file or NodeJS WritableStream */
-  out: {
-		formatName: string
-		url?: string
-		output_stream?: NodeJS.WritableStream
-	}
-}
-/**
- * Initialise the sources for the beamstream process.
- * Note - the params object is updated by the function.
- */
-export function makeSources(params: BeamstreamParams): Promise<null>
-/**
- * Initialise the output streams for the beamstream process.
- * Note - the params object is updated by the function.
- * @returns Promise which resolves to an object with a run function that starts the processing
- */
-export function makeStreams(params: BeamstreamParams): Promise<{ run(): Promise<null>} >
-