[FFmpeg-trac] #11002(avformat:closed): Unnecessary PNG metadata generated

[FFmpeg]

#11002: Unnecessary PNG metadata generated
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             Reporter:               |                    Owner:  (none)
  MasterQuestionable                 |
                 Type:  enhancement  |                   Status:  closed
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:  invalid
             Keywords:  png          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by MasterQuestionable):

 ͏    Consider the following case:\\
 ͏    Generate a sample PNG using alike command there:
 https://trac.ffmpeg.org/ticket/10989\\
 ͏    Process which with !`exiftool "-Gamma=200" "0.png" -o "1.png"`.\\
 ͏    Run !`ffmpeg -hide_banner -nostdin -i "0.png" -i "1.png" -lavfi
 "ssim; [0][1]psnr" -f null -`. [ See also: #10924 ]\\
 ͏    .\\
 ͏    Now we have 2 visually distinct images: in fact identical.\\
 ͏    And displayed randomly across implementations...\\
 \\
 \\
 ͏    Again the similar aforementioned: "-af" this time.\\
 ͏    And the steganographic... Obfuscation?

 ͏    "originally" and proven unneeded bad design:\\
 ͏    Whose influence still propagated... unfortunate.

 ͏    Further explained in:\\
 ͏    https://github.com/MasterInQuestion/talk/discussions/3
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Ticket URL: <https://trac.ffmpeg.org/ticket/11002#comment:11>
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