Chroma subsamlping 4.4.4

[Selur]

NVEnC writes it supports:

h264: auto, baseline, main, high, high444 hevc: auto, main, main10, main444 av1 : auto, main, high

see: https://github.com/rigaya/NVEnc/blob/mas...ile-string
And high should support 4:4:4 color sampling (see: https://aomedia.org/av1/specification/annex-a/)

But it does not, and I simply forgot to disable the options.

You can test it yourself, if you for example use:

ffmpeg -y -loglevel fatal -i "G:\TestClips&Co\files\test.avi" -map 0:0 -an -sn -vf zscale=rangein=tv:ran ge=tv -pix_fmt yuv444p10le -strict -1 -vsync 0 -f yuv4mpegpipe - | NVEncC --y4m -i - --fps 25.000 --codec av1 --profile high --output-depth 10 --colorrange limited --colormatrix bt470bg --cuda-schedule sync --output "G:\Temp\test_2022-11-30@19_30_41_4610_01.av1"

Where you feed NVEncC explicitly with 10bit with 444 content, it will output:

Input Info y4m(yuv444(10bit))->p010 [AVX2], 640x352, 25/1 fps Vpp Filters copyHtoD Output Info AV1 main 10bit @ Level auto

which converts 4:4:4@10bit to 4:2:0@10bit (p010)

According to https://docs.nvidia.com/video-technologi...tion-note/
Ada GPUs support AV1 main profile and thus are capable to encode YUV 4:2:0 8-bit and 10-bit content up to 8192 × 8192 resolution, but not 4:4:4. (that would be high profile)
So your GPU does not support 4:4:4 AV1 encoding.

=> I'll adjust Hybrid to disable Profile, Level, Sampling for the next release.

Cu Selur