[FFmpeg-trac] #9167(undetermined:closed): Color changed when an image converting to video

FFmpeg trac at avcodec.org
Sat Apr 3 02:37:57 EEST 2021


#9167: Color changed when an image converting to video
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             Reporter:  kvsico       |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 Replying to [comment:24 pdr0]:
 So, I did this
 and ffplay -i 2.mp4 -vf extractplanes=y is 120
 ffplay -i 2.mp4 -vf extractplanes=u is 90
 ffplay -i 2.mp4 -vf extractplanes=v is 201

 And then checked with https://res18h39.netlify.app/color and yeah, 238,
 77, 44; 238, 77, 45 convert to the same value after rounding and back it
 is 44 only! What is even more funny is that 238, 77, 46 converts to 120,
 91, 201 but decodes as 238, 76, 46, which also encodes as 120, 91, 201.
 Just... Whatever. I mean, I knew it is what it is, just never had such
 experience.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:27>
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