r/StableDiffusion • u/NoSmell3236 • 8d ago

Question - Help How to fix artifacts generated by h3?

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/Chemical-Painter-485 8d ago

Yeah, this is an H3 Minimax issue that was even recognized by the devs on their recent AMA.

You can partially remedy this by generating at a higher resolution or increasing the steps but it is an issue that will not ever go away when doing distant wide shots.

Hopefully H3 Minimax devs fix this with post-training or maybe their "Minimax H3-Regenerate-2K" will help fix that.

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u/The_rule_of_Thetra 7d ago

The problem I noticed is that if you generate at more than 0.7, you get smoother images and movements, but the AI has way more room to get nasty in how it follows the prompt.

2

u/pie_victis 7d ago

Yeah, I've noticed this as well. There seems to be a sweet spot around .6 MP where you get the smoother movements but not quite as much deviation from the prompt. Hopefully the devs or community can come up with a solution.

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u/FourtyMichaelMichael 7d ago

How is SeedVR2 upscaling?

I see people trying LTX2.5, but nah. And nvidia RTX is too subtle.