[FFmpeg-trac] #7623(avformat:new): Extracted JPEGs have wrong x/y dpi values

[FFmpeg]

#7623: Extracted JPEGs have wrong x/y dpi values
-------------------------------------+-------------------------------------
             Reporter:  UlfZibis     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:
             Keywords:  JPEG aspect  |  unspecified
  ratio dpi                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 ffmpeg -ss 04:45 -t 00:02 -i CYD_copy.vob -movflags +faststart -vf
 atadenoise CYD_atadenoise_4-45_%02d.jpg
 ffmpeg version 3.4.4-0ubuntu0.18.04.1
 built from Ubuntu distribution
 }}}

 The input video has 704x576 with [SAR 12:11 DAR 4:3].
 The x/y dpi values of the extracted JPEGs then should be 11/12 instead
 12/11.
 The resulting JPEGs now have a DAR of 1.12 instead of 1.333 (4:3).

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Ticket URL: <https://trac.ffmpeg.org/ticket/7623>
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