#10839: incorrect YCoCg to RGB conversion in swscale
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Reporter: Connor | Type: defect
Worley |
Status: new | Priority: wish
Component: swscale | Version:
| unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Per https://trac.ffmpeg.org/wiki/colorspace
>The term "YUV" is ambiguous and often used wrongly, including the
definition of pixel formats in FFmpeg. A more accurate term for how color
is stored in digital video would be YCbCr.
When converting AV_PIX_FMT_YUV* to RGB in swscale, a YCbCr matrix is
selected for AVCOL_SPC_YCOCG, and incorrect color is produced.
This happens here:
https://git.videolan.org/?p=ffmpeg.git;a=blob;f=libswscale/yuv2rgb.c;h=0a84b662f9c15a3ee3b4e482ed91212e3f99ff43;hb=HEAD#l64
To fix this, AVCOL_SPC_YCOCG should not use a YCbCr conversion matrix. The
YCoCg conversion matrix can be found at
https://en.wikipedia.org/wiki/YCoCg
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10839>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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