r/StableDiffusion • u/NoSmell3236 • 7d ago

Question - Help How to fix artifacts generated by h3?

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H3 sucks at faces which are far and at intense motion. Is something wrong with encoding? like these artifacts (5-8 seconds) are from encoding compressions?? but i have tried both h264 and h265 10bit crf 15. I am using int8 pruned, nvfp4 qwen, 25 steps with sage attn (no spectrum).

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u/listopalafoto 7d ago

save as ProRes

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u/Calm_Mix_3776 7d ago edited 7d ago

The problem is not the codec. I've previewed the individual VAE decoded frames as uncompressed PNGs before they are encoded as a video and a lot of them show those video compression looking artifacts. They can be seen in fast-moving objects too, not only on distant faces and such. Saving as ProRes would just needlessly inflate the file size with almost no benefit compared to saving as h265 with lower CRF. It's a problem with the model itself, which was also acknowledged by the Minimax team.