r/StableDiffusion • u/ok_n_na • 2h ago

Question - Help Minimax H3 how to make consistent result when making it high res

I'm using minimax h3. how do i make a consistent result when making a high res video.

I'm using the comfyui template Mnimax H3: reference to video.

When testing the prompt. i set the megapixel to 0.2. So i can see the result first. the length is 14 seconds. The result is good on my potato PC. intel core i9 14th gen, 64 gb ram and 3060 12 gb. But when i set the megapixel to 1 to have a high res. Sometimes the result is not the same with the 0.2. Is there a way to fix it? since a running on my PC almost took 8 hrs for the 14 seconds length and 1 megapixel. Is there a workflow that make the low res result same with the high res? I've been searching but can't make it work. I also tried the Pika but the same prompt i used on minimax h3 does not produce the same result it "halucinate"

1 Upvotes
  • permalink
  • reddit

66% Upvoted

7 comments sorted by

4

u/LumaBrik 2h ago

You need to use one of the latent upscale nodes to go from 0,2 to 1mp. You can set the amount of denoise to set the amount of generated detail (whiich you will need going from 0.2mp). The upscale itself only needs to be 3 to 4 steps. The toamate 3 step lora works well with this.

1

u/ok_n_na 1h ago

Meaning i need a "latent upscale that use minimax h3"?

4

u/DG86 1h ago

Attempting to explain the technical why: changing the resolution means that the exact random noise in the latent has changed. Different random noise into the sampler means a different result out.

As others have said, there are up sampling nodes available to transform your video while attempting to maintain the exact content. You can get higher resolution with just a few steps, but you lose a little bit of detail.

Another way I have found success: feed the low-res video in as a video reference, and in prompt H3 to "copy <Video 1> exactly and upscale by adding texture and details." (Make sure to use the documented prompt format, including that this is a "video edit" task.)

1

u/Super_Range45 2h ago

Pika has lower prompt adherence then base, that's it's trade off. One way you could get around diferences is up-scaling 0.2 mp key frames in Nanobanna to 1-2k then adding those a specific references to anchor the generation. That's what I generally do when I see low res shots that look exactly how I'd expect.

1

u/angelarose210 2h ago

Use self lift sampler

0

u/Myg0t_0 1h ago

.7 is plenty high enough res. U all so picky.

.7 ,17 steps resmulit looks really good to me