[FFmpeg-trac] #4536(ffmpeg:new): mkv audio reencoding leads to nonuniform video timecodes
FFmpeg
trac at avcodec.org
Wed May 6 15:53:36 CEST 2015
#4536: mkv audio reencoding leads to nonuniform video timecodes
------------------------------------+----------------------------------
Reporter: sneaker | Owner:
Type: defect | Status: new
Priority: normal | Component: ffmpeg
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
------------------------------------+----------------------------------
Comment (by sneaker):
You are kind of right, I didn't look close enough. Happens on 3 occasions:
49 - 0 = 49
167 - 132 = 32
216 - 167 = 49
Then again, the sample is short and there is a general shift of the
timecodes. (didn't test if async)
I also suspected special Opus handling at first but it happens with other
formats as well (but not with pcm). Interestingly, it also only happens on
those 3 points (+the general skew) but each one with different timecodes:
ac3:
{{{
# timecode format v2
0
48
89
131
167
215
256
298
340
381
423
465
506
...
}}}
mp3:
{{{
# timecode format v2
0
67
108
150
167
234
275
317
359
400
442
484
525
}}}
vorbis:
{{{
# timecode format v2
0
45
86
128
167
212
253
295
337
378
420
462
503
...
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4536#comment:2>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list