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') },