How to clean up old animated footage? Recently I ripped a couple of old DVD's to preserve them.
The original rip has a resolution of 720*576 and runs with 5100kb/s on 25fps interlaced.
I tinkered around with Handbrake and (hopefully) found the best settings.
The final file is a fifth of the size and runs progressively on 1000kb/s.
EDIT: Using h.265 NVENC
Getting to my question now. In the final product, there are a lot of colour artefacts in solid coloured planes. Is there any way to i.e. detect the mean colour in a similar coloured plane and colour the whole plane like it?
The artifacts are on the original footage because a DVD used some oldie MP2 codec, you need to live with it.

You could try using a denoiser, some of them can detect compression artifacts. I am not spamming or anything, but take a look at Neat Video Denoiser.