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

FFmpeg trac at avcodec.org
Wed Mar 31 03:22:03 EEST 2021

#9167: Color changed when an image converting to video
             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            |

Comment (by Balling):

 Replying to [comment:16 pdr0]:
 >but for the most part you can see much better superblack and superwhite
 tones than on a computer monitor

 Superblack must be invisible on default brightness (a.k.a. black level).
 It should be the same as black that is.

 >EBU r103

 Yeah, I read it.

 >So Y=14,CbCb128 <=> RGB 14,14,14

 I agree.
 >Consumer TV's vary widely on how they display

 I have LG C9: in version 4 of firmware they output superwhite values even
 in internal player, you can calibrate 8.6% Superwhite overshot. And it
 supports both sYCC and xvYCC digital formats (as can be forced by Nvidia
 control panel digital format option).

 >In broadcast and professional video distribution, 0 and 255 are reserved
 for sync.

 In HDMI too, the HDMI spec is on archive.org. But not in files.

 >you'd clip to [1,254] before you do anything;

 Frankly speaking Nvidia driver does it for you. Just like MFF can do it.

 >but preferred min/max is usually [5,246]

 Yeah, that is also per EBU R103. But that is for HDR mainly.

 >No "superblack" by your definition

 There is no superblack in bmp. It is full range, superblack does not exist
 in full range. But it does exist in avc stream. That is again, if there is
 no another bug in --gamut-warning. See https://github.com/mpv-

Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:17>
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