##build

1. sudo apt install libtheora-dev libvorbis-dev

2. download ffmpeg-4.3, unzip, cd ffmpeg-4.3

3. ./configure --prefix=/usr/local/ffmpeg --enable-shared --enable-libfdk-aac --enable-gpl --enable-nonfree --enable-postproc --enable-avfilter --enable-pthreads --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-decoder=h264 --enable-encoder=libx264 There will be some errors occur。

4. yasm/nasm not found or too old. Use --disable-yasm for a crippled build: wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz tar -zxvf yasm-1.3.0.tar.gz ./configure && make && make install

5. ERROR: libfdk_aac not found:

https://sourceforge.net/projects/opencore-amr/files/fdk-aac/ download fdk-aac-0.1.5.tar.gz ./configure&& make && make install

6. ERROR: libtheora not found:

http://downloads.xiph.org/releases/theora/?C=M;O=D libtheora-1.2.0alpha1.tar.gz ./configure && make && make install

7. *** Could not run Ogg test program, checking why... *** The test program failed to compile or link. See the file config.log for the *** exact error that occured. This usually means Ogg was incorrectly installed *** or that you have moved Ogg since it was installed:

http://downloads.xiph.org/releases/ogg/?C=M;O=D libogg-1.3.2.tar.gz ./configure && make && make install

8. ERROR: libvorbis not found: http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.3.tar

9. ERROR: libmp3lame >= 3.98.3 not found: http://downloads.sourceforge.net/lame download lame-3.99.5.tar.gz ./configure && make && make install

10. ERROR: libx264 not found: https://www.videolan.org/developers/x264.html, download a stable version ./configure --enable-shared --disable-asm && make && make install

11. ERROR: libxvid not found: wget http://downloads.xvid.org/downloads/xvidcore-1.3.5.tar.gz cd build/generic/ ./configure && make && make install

12. WARNING: Option --enable-decoder=libx264 did not match anything WARNING: using libfdk without pkg-config WARNING: using libx264 without pkg-config:

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH sudo ldconfig

13. then cd ffmpeg-4.3 && ./configure ...... && make -j8 && sudo make install

14. If there is no openssl in your system, openssl also need to be installed.

15. RUN: if ffmpeg was installed into /usr/local/ffmpeg/lib: export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/ffmpeg/lib

16. change onvif source code: stdsoap2.h: #define WITH_OPENSSL comment out #include <xlocale.h>

Searched the system for this file, found locale.h rather than xlocale.h Searched the web to read about both. Found out that xlocale.h is the threadsafe version of locale.h