I know they are "Very experimental and buggy"
Open an issue to record its behav may be better.
I only tested the shaders in hq folder. d682103
Sometimes the artifacts were dots instead of blocks.
The one possible reason is that the lack of scene's changing's detection algorithm ?
It's obvious those wrong pixels come from the last frame.(Also some next fram's pixels come into the last one.)

I only tested the shaders in
hqfolder. d682103Sometimes the artifacts were dots instead of blocks.
The one possible reason is that the lack of scene's changing's detection algorithm ?
It's obvious those wrong pixels come from the last frame.(Also some next fram's pixels come into the last one.)