--enable-libopus
--enable-decoder=flac --enable-decoder=libopus
--enable-decoder=vp8
--enable-encoder=flac --enable-encoder=libopus
--enable-encoder=vp8
--enable-demuxer=matroska --enable-demuxer=flac --enable-demuxer=ogg
--enable-muxer=matroska --enable-muxer=webm --enable-muxer=flac
--enable-muxer=ogg
--enable-protocol=data --enable-protocol=file --enable-protocol=pipe
--enable-filter=aresample
