Weet je dat zeker? Bij mij is het ffmpeg based.
checking for libavutil variant... ffmpeg
checking for libavcodec >= 57.37.100 libavutil >= 52.0.0... yes
checking libavcodec/avcodec.h usability... yes
checking libavcodec/avcodec.h presence... yes
checking for libavcodec/avcodec.h... yes
checking libavutil/avutil.h usability... yes
checking libavutil/avutil.h presence... yes
checking for libavutil/avutil.h... yes