Our current PlatformDecoderModule::SupportsMimeType implementations only check for support by performing a lookup on the mimetype as a strink and always assume that the underlying decoder is usable and is working.
This is an invalid assumption; especially with the FFMpeg decoder that may not be compiled with some particular codec support (like if it was compiled with --disable-nonfree).
When searching for ffmpeg or libav we currently look for libavformat and search for a specific version. We have no use for the libavformat library as we only use libavcodec and (indirectly) libavutil. The version numbering in libavformat is also completely irrelevant for our use.
With this commit, we will look for libavcodec instead.
trav90