AV_CODEC_ID_VP4 1725 libavcodec/codec_desc.c .id = AV_CODEC_ID_VP4, AV_CODEC_ID_VP4 3249 libavcodec/vp3.c .id = AV_CODEC_ID_VP4, AV_CODEC_ID_VP4 310 libavformat/riff.c { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },