[FFmpeg-trac] #6251(undetermined:new): copyts fails badly for negative start time
FFmpeg
trac at avcodec.org
Sat Apr 29 14:19:46 EEST 2017
#6251: copyts fails badly for negative start time
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Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: mpegts dts | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by ferrys):
Its not only for negative start time... If you use -copyts - this happens
because of a timestamp overflow in the MPEGTS(section 3.3) demuxer. Since
timestamps in MPEG-TS have 33 bits and 16 a frequency of 90 kHz, they
overflow exactly after 233
90000 95443:72 s
26:51 h.
after 26h 51 min. ffmpeg going down... please fix it beacause it is
necessary to use -copyts for preserving audio video sync by transcoding
udp multiast streams for example... if you not use this parameter you can
expect bad sync in audio video - small problem in audio track is enough...
ffmpeg is then not able to hold sync... in cas of clean input stream,
everything is ok and you can nto use this...
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Ticket URL: <https://trac.ffmpeg.org/ticket/6251#comment:1>
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