[FFmpeg-trac] #8345(undetermined:new): Audio Async by 1 frame from DNX files

[FFmpeg]

#8345: Audio Async by 1 frame from DNX files
-------------------------------------+-------------------------------------
             Reporter:  Vespucci     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  Audio Async  |               Blocked By:
  DNX                                |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 In my post production company a Dubbing mixer realised that the audio is
 async by 1 frame in one of our tool.

 After investigating he realised that ffmpeg output is out of sync by 1
 frame for a few years now, no matter which version of ffmpeg

 You can see the issue on the following screen shot.
 [https://farm-share.s3-eu-west-1.amazonaws.com/ffmpeg-
 issue/Shifted+Audio+-+MXF+Export+Original+1+-+start.png]

 We also noticed that the end of the file is slightly different.
 [https://farm-share.s3-eu-west-1.amazonaws.com/ffmpeg-
 issue/Shifted+Audio+-+MXF+Export+Original+1+-+end.png]

 How to reproduce:
 I used the most basic transcoding ffmpeg -i <input> <output> as you can
 see in the report here:
 [https://farm-share.s3-eu-west-1.amazonaws.com/ffmpeg-
 issue/ffmpeg-20191030-110046.log]

 Here is an original file that is causing the problem:
 [https://farm-share.s3-eu-west-1.amazonaws.com/ffmpeg-
 issue/Shifted+Audio+-+MXF+Export+Original+1.mov]

 Here is the shifted compressed video:
 [https://farm-share.s3-eu-west-1.amazonaws.com/ffmpeg-
 issue/Shifted+Audio+-+MXF+Export+Original+1.mp4]

 You can right click on each link and "Save link as..." to get the file,
 let me know if you want me to send the file in a different way.

 Thanks for your help

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Ticket URL: <https://trac.ffmpeg.org/ticket/8345>
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