I actually did not notice this at first. Then I started rendering some sequences.
Has anyone done any testing with animation?
I am not sure how to explain this clearly so I will just link to the video:
Showing the botchy artifacts. They look like a post filter over the image which is fine. But it does not seem to be doing any interpolation on a frame by frame basis. And this makes the blotchy areas appear to be a film over the top of the image that does not move.
Maybe there is a setting I am not using correctly. But this is not usable for animation as it is.
Even if I pump up the samples which is clearly the issue here. This lover sample rate (32) shows the issue of the denoise filter as a post effect.
As long as it does what it is doing it is not usable for animation even at higher sample rates. It will always just look like a static filter effect that does not appear to be moving. From what I can only guess.
Maybe someone has examples at a higher sample rate?
I will try another test as well with less frames at a higher sample rate.