[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
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 Replying to [comment:12 paheikki]:
 > Can I still ask whether the MPEG4 streamx without an aspect ratio were
 V104.mp4 and U104.mp4 indeed?

 Only you can answer this: I don't have the input images and I don't use
 gpac.

 > The pic from which they are produced has the aspect ratio as the other
 ones (dimension 640x480)

 No, at least one picture has no aspect ratio defined (you can see that in
 the txt file you attached) while most files have an aspect ratio (either
 {{{100:100}}} or {{{1:1}}} which makes no difference.

 (Yes, FFmpeg interprets the image DPI as the aspect ratio, I don't think
 this behaviour should be changed.)

 > I just want to verify that this explanation is correct. I'll then try
 the workaround you suggested.

 Other developers may disagree, in all honesty I find this comment a tiny
 bit rude.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4163#comment:13>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker