This is actually a bug, that just doesn't affect anything. First of all, the logic of functions that work with ff_codec_bmp_tags is "One tag -- one codec id", or "one codec id for one tag". Also if you write this tag as MPEG2VIDEO, and then read the header (all by ffmpeg), it will interpret as MPEG1VIDEO: ffmpeg -i whatever -vcodec mpeg2video test.avi && gdb ffprobe_g (gdb) break avi_read_header (gdb) r -i test.avi (gdb) finish (gdb) p s->>streams[0]->codecpar->codec_id
$1 = AV_CODEC_ID_MPEG1VIDEO
if you will write an mpeg1video , it will be created with tag
'mpg1', not 'mpg2' in all cases (because correlation
AV_CODEC_ID_MPEG1_VIDEO -- 'mpg1') stands before 'mpg2' tag in
ff_codec_bmp_tags:
ffmpeg -i whatever -vcodec mpeg1video test.avi
(output)
...
(output)
Stream #0:0: Video: mpeg1video (mpg1 / 0x3167706D),
So, this patch does not affect on writing mpeg1video to riff files.
0001-avformat-riff-remove-useless-tag-correlation-mpg2-MP.patch
Description: Binary data
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
