How to enable GPU for MCTemporaldenoise filter?

[Selur]

Oh how do I determine that, what the color space and bit depth are?

Look at the script, in case no color conversion is done the it's still the same as the input otherwise it's determined by the last color conversion.

I don't think any denoising is being performed, when I set the channels to UV.

Then your noise it probably is only in the Y channel (noise only being in one of the YUV channels isn't uncommon).

while the developer of KNLmeansCl had stated that its maximum value had been increased to 8 some time back.

Would have been helpful if the author would have also noted that somewhere in the documentation and not only in the changelog,...
Atm. w-radius is limited to 16 and s-radius is limited to 4 in Hybrid.
-> will adjust s-radius limit to 8 for the next release.
Wondering whether the high bit depth support not only works in Avisynth+ but also in Vapoursynth.
(only see it mentioned in the changelog for Avisynth+ => nope, feeding it yuv420p10 throws 'vapoursynth.Error: knlm.KNLMeansCL: only YUV444P10 and RGB30 are supported!')

Cu Selur