[FFmpeg-user] Fixing bad DTS/PTS without reencode
battistel at gmail.com
Thu Jan 17 11:20:09 CET 2013
2013/1/17 Carl Eugen Hoyos <cehoyos at ag.or.at>
> Massimo Battistel <battistel <at> gmail.com> writes:
> > http://www.datafilehost.com/download-527e92a0.html
> > Discontinuty is around 4.8 seconds.
> I can reproduce the discontinuity with ffmpeg -debug_ts
> (433800 -> 441000).
> Is there a problem when FFmpeg converts the file?
If I *transcode* the video (ffmpeg -i sample.mpg -vcodec mpeg2video
out.mpg), ffmpeg fixes the discont by duplicating the frame at the
discontinuity point. Infact the transcoded file has 1 frame more (253
instead of 252).
> Iirc, discontinuities in mpeg streams are allowed,
> or am I wrong?
You are right, but the original question was a bit different.
Discontinuities in timecode can cause wrong duration detection.
I have used some directshow demuxers calculating video duration like that:
lastTimeCode - firstTimeCode + avgFrameDuration.
This method would give wrong result if files contains discontinuities. btw,
I have other samples with bigger discontinuities.
Is it possible someway to play the frame at discont point for 80ms instead
Could I manage this (programmatically at this point) changing
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