[FFmpeg-trac] #3794(swscale:new): SWSCALE: Quantization Errors in Y Studio Range

FFmpeg trac at avcodec.org
Thu Feb 4 06:30:18 EET 2021

#3794: SWSCALE: Quantization Errors in Y Studio Range
             Reporter:  troy_s      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:  range       |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by Balling):

 Did you see this: https://trac.ffmpeg.org/ticket/1582#comment:14

 Also there is a funny bug in bmp vs. png:
 -color-shift ('''that''' was totally surprising for me). This also needs
 to be retested after 98038e2ee0c40530c42db70ed3d2f5e0c17b175e. This was
 also '''totally surprising''' for me that you used BT.709-1 (first
 version, OMG) matrix coeff. (https://www.itu.int/dms_pubrec/itu-r/rec/bt/R
 -REC-BT.709-1-199311-S!!MSW-E.doc) while those were updated in BT.709-2.
 It may have influenced this stuff. BTW, it is very NOT funny. And I was
 thinking why there are so many out-of-gamut stuff with mpv's --gamut-
 warning in some test patterns. So here is why.

Ticket URL: <https://trac.ffmpeg.org/ticket/3794#comment:14>
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