FLV_VIDEO_CODECID_MASK  303 libavformat/flvdec.c     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
FLV_VIDEO_CODECID_MASK 1213 libavformat/flvdec.c         int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);