Curiosity about upscaling GAN generated results

[5agado]

I generate or edit some works of mine via GAN or other generative models, but as they generally work on small resolution I wanted to rely on secondary models for the upscaling part. However I obtain very poor results.

See for example how this 256x256 image

Results in this poor 1024x1024 version

Curious to hear any explanations or speculation about this, and if there is any way around it.

[caryknoop]

It looks like it is chroma subsampling related. I would make sure your generated images from the video are sampled from 4:2:0 through 4:4:4 to RGB correctly.

[rpolyano]

I'm seeing similar results, and I think I'm sampling it correctly: ffmpeg -i 'video.avi' -vf format=rgb24 out_%05d.png anything obvious wrong with those args?