[FFmpeg-trac] #1866(undetermined:new): Half speed video output ts -> flv transcode
FFmpeg
trac at avcodec.org
Mon Oct 29 18:29:54 CET 2012
#1866: Half speed video output ts -> flv transcode
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Reporter: larvalho | Owner:
Type: defect | Status: new
Priority: normal | Component: undetermined
Version: 1.0 | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by cehoyos):
* component: FFmpeg => undetermined
Comment:
Replying to [ticket:1866 larvalho]:
> Summary of the bug:
> Some mpeg 2 ts files (h264 + aac, generated by Crestron Lecture
Capture), when transcoded using ffmpeg to flv, produce video that plays
back at half the speed (frame rate is retained but number of frames is
doubled), while the audio is rendered correctly. There is a 10 minute
delay to the video, but this is in the original file, and eliminated with
a '-vf setpts=PTS-STARTPTS'.
I am not sure I understand:
Is the original file supposed to play (ie with video and audio)?
Or is the 10 minute delay intentional?
In the first case, I would suspect this is a duplicate of ticket #424, in
the second case, I wonder how ffmpeg is supposed to transcode the stream?
Shouldn't it try hard to eliminate the A/V desync (leading to slow or fast
video)?
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1866#comment:1>
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