[FFmpeg-trac] #3558(undetermined:new): "-fflags +igndts" generates wrong dts when rewrapping some ts files to mp4

[FFmpeg]

#3558: "-fflags +igndts" generates wrong dts when rewrapping some ts files to mp4
-------------------------------------+-------------------------------------
             Reporter:  wim_arbor    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mov          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by wim_arbor):

 Some observations:
  * Adding {{{+genpts}}} does not help.

  * Copying just the audio stream and transcoding the video stream results
 in a proper output using this commandline:
 {{{
 ffmpeg -y -fflags +igndts -i of_commercial_dvb_cut.ts -f mov -c:a copy
 out.mp4
 }}}

 * But copying just the videostream and transcoding the audio to aac does
 not resulting in the same error (pts<dts) using this commandline:
 {{{
 ffmpeg -y -fflags +igndts -i of_commercial_dvb_cut.ts -strict -2 -f mov
 -c:v copy out.mp4
 }}}

 * Transcoding both streams works fine.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3558#comment:1>
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