MM_HEADER_LEN_AV 64 libavformat/mm.c if (AV_RL32(&p->buf[2]) != MM_HEADER_LEN_V && AV_RL32(&p->buf[2]) != MM_HEADER_LEN_AV) MM_HEADER_LEN_AV 107 libavformat/mm.c if (length == MM_HEADER_LEN_AV) {