[FFmpeg-trac] #933(undetermined:reopened): A/V desynch when transcoding A/V files with timestamps non starting from 0 with -copyts
FFmpeg
trac at avcodec.org
Thu Nov 22 00:06:25 CET 2012
#933: A/V desynch when transcoding A/V files with timestamps non starting from 0
with -copyts
-------------------------------------+-------------------------------------
Reporter: saste | Owner:
Type: defect | Status: reopened
Priority: normal | Component:
Version: git-master | undetermined
Keywords: timestamp | Resolution:
desynch mpegts | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by saste):
Replying to [comment:10 cehoyos]:
> Is this only reproducible with -acodec libfaac or also with -strict -2
-acodec aac ?
Tracked the problem to do_video_out() in ffmpeg.c, if vsync != passthrough
the input value is ignored (this is significantly different from what
happened 10 months ago), with the command:
{{{
ffmpeg -vsync passthrough -copyts -i ~/s/columbia-intro.ts -acodec libfaac
-y columbia-intro.out.ts
}}}
I got synched timestamps, yet there is a mismatch of around ~1 between
input and output timestamps.
Also documentation for -copyts should be fixed (it only disables input
timestamps processing).
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/933#comment:11>
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