[FFmpeg-trac] #9705(undetermined:closed): Wrong value is written to *.pgm file

[FFmpeg]

#9705: Wrong value is written to *.pgm file
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             Reporter:  Michael      |                    Owner:  (none)
  Koch                               |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Elon Musk):

 Also, do your homework, geq can make use of isnan() function so you can do
 your own mapping inside geq filter.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9705#comment:4>
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