[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
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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 |
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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:
https://video.stackexchange.com/questions/19944/ffmpeg-bmp-to-yuv-x264
-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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