#11541: All NVENC encoders change bt709 color space to bt470bg when pixel
format is
not specified
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Reporter: fmnijk | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: colorspace | Blocked By:
NVENC scale |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by fmnijk):
If it's not related to pixel format, why does the color space change when
I add the pixel format parameter?
To demonstrate:
First command:
ffmpeg -y -i input_%04d.exr -vf "scale=out_color_matrix=bt709" -c:v
av1_nvenc output.mp4
Result:
"color_space": "bt470bg", # Should be bt709
Second command:
ffmpeg -y -i input_%04d.exr -vf
"scale=out_color_matrix=bt709,format=yuv420p" -c:v av1_nvenc output.mp4
Result:
"color_space": "bt709"
The only difference is adding format=yuv420p to the filter chain, which
fixes the issue. This strongly suggests there is a bug in how NVENC
encoders handle color space when no format filter is explicitly specified.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11541#comment:5>
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