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

FFmpeg trac at avcodec.org
Wed Mar 31 02:03:31 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:14 pdr0]:
 >I believe you, but not perfect as in off by -1 in B.

 Oh, wow, I did not see that ;( I looked into topic starter hex values
 #ee4d2c which he gave wrong. Wow, sorry. Maybe it RGB'''A''' issue? Will
 have to check.

 >your version of mpv is setup

 I use --no-config :)

 >How are you defining "superblack" ? <0 RGB in any channel ?

 No, standard definition: 16, 128, 128 in limited range YCbCr is black. If
 Y is less than 16 than it is superblack. 0 is reserved though, in HDMI
 interface. Not in files AFAIK. So it is 15, 128, 128; 14, 128, 128; ... 1,
 128, 128. If Cb or Cr are not 128, it is xvYCC already :)

 Again, that is the point: RGB to YCbCr should not introduce superblack,
 IMHO. But that is just my opinion. D:) Sorry again about that Blue

Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:15>
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