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

FFmpeg trac at avcodec.org
Wed Mar 31 04:26:23 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 pdr0):

 Replying to [comment:19 Balling]:
 > >"random" values that end up mapping to out of gamut RGB values.
 >
 > Yeah. But lossless AVC is a little bit much for this.


 Definitely;  but that's just to demonstrate there is no problem with the
 actual math part of RGB<=>YCbCr conversion

 When you're doing this to EBU specs, in addition to the errors/ spurious
 values from lossy encoding - you're generally subsampling too , which
 creates many more out of gamut values. Often you need to lowpass or use a
 professional legalizer  to pass checks. But you're allowed 1% out of gamut
 of active picture area leeway in most places, and that's the
 recommendation in r103 too

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Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:20>
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