[BUG] Can't apply Vaporsynth Knlmeanscl filter to all planes

[Selur]

Will send you a version which fixes the color space issue via PM after I compiled, packaged and uploaded it (in ~30min).
If that doesn't help with your problem, then it's probably a bug in KNLMeansCL itself (since the script seems to be fine) and your only hope of getting it fixed it by reporting it to the author of KNLMeansCL over at https://github.com/Khanattila/KNLMeansCL/issues

Cu Selur