Merge branch 'master' of https://github.com/bbc/bigscreen-player into badgers-655-lowlatency-metrics

Author: ryanmccartney

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "bigscreen-player",
-  "version": "10.5.0",
+  "version": "10.5.1",
   "type": "module",
   "description": "Simplified media playback for bigscreen devices.",
   "main": "dist/esm/main.js",

package.json

@@ -513,13 +513,16 @@ function MSEStrategy(
   function onCurrentTrackChanged(event) {
     if (!isAudioDescribedAvailable()) return
 
+    audioDescribed.enable = isAudioDescribedEnabled()
     const mediaType = event.newMediaInfo.type
+
     DebugTool.info(
       `${mediaType} track changed.${
-        mediaType === "audio" ? (isAudioDescribedEnabled() ? " Audio Described on." : " Audio Described off.") : ""
+        mediaType === "audio" ? (audioDescribed.enable ? " Audio Described on." : " Audio Described off.") : ""
       }`
     )
-    audioDescribed.callback && audioDescribed.callback(isAudioDescribedEnabled())
+
+    audioDescribed.callback && audioDescribed.callback(audioDescribed.enable)
   }
 
   function publishMediaState(mediaState) {
@@ -591,6 +594,16 @@ function MSEStrategy(
 
     mediaPlayer.initialize(mediaElement, null)
 
+    modifySource(presentationTimeInSeconds)
+  }
+
+  function modifySource(presentationTimeInSeconds) {
+    if (mediaPlayer.isReady()) {
+      // Reset source to apply media settings for the new source
+      // dash.js will reset media settings if a new source is attached while its initialised with a source
+      mediaPlayer.attachSource(null)
+    }
+
     mediaPlayer.setInitialMediaSettingsFor(
       "audio",
       audioDescribed.enable
@@ -603,10 +616,6 @@ function MSEStrategy(
           }
     )
 
-    modifySource(presentationTimeInSeconds)
-  }
-
-  function modifySource(presentationTimeInSeconds) {
     const source = mediaSources.currentSource()
     const anchor = buildSourceAnchor(presentationTimeInSeconds)