[FFmpeg-trac] #3859(undetermined:new): mp4: start_time never zero

FFmpeg trac at avcodec.org
Fri Sep 19 19:51:56 CEST 2014

#3859: mp4: start_time never zero
             Reporter:  blacktrash   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by blacktrash):

 Replying to [comment:10 cehoyos]:
 > I still don't understand how I can reproduce the problem: Is there an
 input sample and command line for which I can reproduce A/V desync or is
 this ticket only about a warning that a third-party tool shows?

 1. You get a negative start_time with ffprobe for format and audio stream
 2. With the segment muxer the first segment always exceeds segment
 duration (in spite of forced key frames etc.)
 3. asetpts=PTS-STARTPTS does not make the audio start at 0 as it's
 supposed to do

Ticket URL: <https://trac.ffmpeg.org/ticket/3859#comment:12>
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