[FFmpeg-trac] #4163(undetermined:closed): Encodes incompatible videos from similar picture and audio files

[FFmpeg]

#4163: Encodes incompatible videos from similar picture and audio files
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             Reporter:  paheikki     |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mjpeg        |               Resolution:  invalid
  aspect                             |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by paheikki):

 Thanks. I did not say that the issue is reproducible using these two
 images. I meant it is reproduced every time but I did not know the
 culprit. Our system creates the sounds and the subtitles dynamically,
 therefore I could not test the two pics manually (not using the same
 sounds at least). Can I still ask whether the MPEG4 streamx without an
 aspect ratio were V104.mp4 and U104.mp4 indeed? The pic from which they
 are produced has the aspect ratio as the other ones (dimension 640x480)
 but the DPI setting is missing from the metadata. I just want to verify
 that this explanation is correct. I'll then try the workaround you
 suggested.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4163#comment:12>
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