where is the cache/folder that upscales the images?

[ClarissaGazalaEvanthe]

after trying your library, suddenly my memory increased a lot,
where is the location of the data folder / cache of the converted / failed images?

I use ubuntu linux

[k4yt3x]

With version 6.0.0, there are no cache written to disk. The only thing written to disk is the output video. You can probably use something like gdu to figure out what's using up your space.