[FFmpeg-trac] #3631(undetermined:new): Aspect ratio change in the middle of a video stream

FFmpeg trac at avcodec.org
Sat May 10 17:40:01 CEST 2014

#3631: Aspect ratio change in the middle of a video stream
             Reporter:  mar          |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  aspect       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by mar):

 Yes, you are right. I have not used ffplay to view jpeg before, and it
 displays the image correctly.
 However, if I view the jpeg in another viewer (e.g. Firefox or Photoshop
 or the Windows default image viewer) it does not display correctly. And
 also the pixel size is not correct. It seems that the information of the
 aspect ratio is preserved in the jpeg file and that ffplay "stretches" the
 image when it is displayed (stretching also causes a bit of quality loss).
 But the image is not "stretched" by other viewers. Is this saving of the
 aspect ratio in the jpeg a "proprietary" feature used by ffmpeg or are all
 those other vierwers "buggy"?

Ticket URL: <https://trac.ffmpeg.org/ticket/3631#comment:7>
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