[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 Balling):

 "I mean the necessity of their existence."

 PNG without any chunks just is assumed to be sRGB... Not hard.

 ====

 Atmos only has 5.1 or 7.1 channels. So when you decode you get 6 tracks in
 wav file or 8 tracks. Yet that is further decoded into 16 tracks and with
 ADM metadata that says how the sound moves around. Stegonography.

 "probably not metadata, but actual sound data." It is text binary data
 (like what Android uses for binary xml in manifest.xml) that is just  X,
 Y, Z coordinates and time.

 "Unjustifiable complexity and bad primitives."

 TS buffers are originally what is needed to move data between satellites.
 In space.


 "Designers probably did not well understand in advance: what video really
 is"

 The problem is not video (though if it is variable frame rate it is a big
 problem, actually), but audio. E.g. Dolby TrueHD has 1200 fps data. So
 every second you have 1200 frames.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11002#comment:10>
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