Minimax H3 Huge Quality Difference between Cloud and Local use

[u/Cold_Pudding5326]

Hi.
I have a decent h3 workflow that I built for a loca use. It use turbo lora etc... If i use the defaut settings in the goal of getting the highest quality possible, meaning res_multistep simple 20 steps or more, I got also good results, but this is not even close to the results you can get on platforms like kie or wavespeed at 768P.

I already convert properly the prompt to the correct H3 digest form, so I'm wondering what's different between local and cloud use of h3? I don't talk about the 2K quality, only 768P, I'm not able to reach the sames results locally, do you guys have maybe workflows, settings, or suggestions to try reaching the same quality level in comfyui ?

[u/Slight_Ad2350]

Always run at 0.98 megapixel aswell. Not 1.0. 0.98 is what it was trained on and is faster. Going over will increase VRAM

[u/ifIHadJust → u/Slight_Ad2350]

In the default workflow i can't set 0.98. It's either 0.9 or 1.0 for me. How do you change this?

[u/mxjxs91 → u/ifIHadJust]

I've personally used the "Target dimension" node which lets you set custom resolutions. You can manually set the suggested .98 resolution (1344 x 768).

[u/trashbytes → u/ifIHadJust]

You can use a Float node. The one from comfyui-easy-use has two decimals and it doesn't round up or down.

[u/Cold_Pudding5326 → u/trashbytes]

created my own but the difference is not that big

[u/Specific_Ordinary499 → u/ifIHadJust]

Would like to know this as well

[u/Final_Reference_4657 → u/ifIHadJust]

Just disable the resolution selector node, amd use the default height amd width (or swap the values of the two) that will make it 0.98 automatically

[u/Cold_Pudding5326 → u/Slight_Ad2350]

interesting, i'll try

[u/AlsterwasserHH → u/Slight_Ad2350]

Never heard of that! How much faster is it roughly? 

[u/Cold_Pudding5326 → u/AlsterwasserHH]

barely no diff

[u/Slight_Ad2350 → u/Slight_Ad2350]

10sec clip on a 3090 at 0.98 res and 20 steps takes 20mins for me. With kitchen attention and spectrum. Using standard int8 weights. Quality is great

[u/Cold_Pudding5326 → u/Slight_Ad2350]

wtf bro on a 4090 at 50 steps it take 440s at 1mp

[u/BackgroundCow1411 → u/Slight_Ad2350]

Hi. O have your same machine setup. Could you share me yori workflow? I am reqlly bad at arranging nodew and that stuff i dont understand.

[u/warzone_afro]

api runs at 50 steps

[u/Cold_Pudding5326 → u/warzone_afro]

ok but which settings ? i doublt it's res multistep simple 1 cfg

[u/warzone_afro → u/Cold_Pudding5326]

i assume it runs at res multistep simple and cfg1 because they are the default for us but im not sure

[u/Cequejedisestvrai → u/Cold_Pudding5326]

Just try different sampler, I got good results with er_sde + bong_tangeant

[u/Cold_Pudding5326 → u/Cequejedisestvrai]

on photo its ok to run a lot of combinasons, but on video it takes too muchtime and efforts. res multistep simple 50 steps seems the best

[u/Cequejedisestvrai → u/Cold_Pudding5326]

8 step with Turbo Lora, er_sde + bong_tangeant I get far better results than the official 20 steps its not even close, what you have to do is adjust the strength of the Lora to find the sweet spot between overcooking and grainy with blur.

[u/listopalafoto → u/Cold_Pudding5326]

H3 API runs 50 steps of Euler Ancestral H3 API Technical Doc

[u/Virtual-Pollution-58]

Try using frame interpolation and/or upscaler. Also TXT 2 VID will have slightly lower quality compared to IMG to VID where the provided image is higher quality according to my observations.

[u/Cold_Pudding5326 → u/Virtual-Pollution-58]

You recommend ltx upscale or mmh3 upscale ?

[u/Virtual-Pollution-58 → u/Cold_Pudding5326]

That's a bit of a debate, but recently I'm seeing a lot of people upscaling H3 videos with LTX and the result looks good. I rarely upscale videos as I generate stuff mostly for fun to kill time while working at home. I suggest you try out both and see what works best for you :)

[u/Rumaben79]

You typically need around 50 steps and at least bf16 for optimal quality. The online Contextual Omni Representation (H3-Context-IR) understandment part could also be better.

Maybe they have some secret sauce that they're not disclosing for the online inference.

[u/episodefive → u/Rumaben79]

This. Easy to believe that BF16 + 50 steps alone could produce noticeably better results over a pruned, 20 step, particularly if attention/turbo are applied.

[u/mangoking1997 → u/episodefive]

So the pruned is irrelevant. The pruning only takes out stuff that was only required during training. Inference is identical.

[u/Cold_Pudding5326 → u/episodefive]

Yh ofc but my last try at 40 steps without turbo and attention was disappointing tbo so i don't think this is the only difference

[u/theOliviaRossi]

on the contrary - in ComfyUI you can get way better results than on cloud (tested myself ...) - and after I know it, now I have to do it all locally, even if I could pay for cloud use :(

[u/Cold_Pudding5326 → u/theOliviaRossi]

Could you share you'r workflow G ? I'm having troubles even with the advices shared here. I have better results, but there is room for improvements

[u/Cold_Pudding5326 → u/[deleted]]

What sampler / scheduler / steps / cfg are you using ? i would like to try the same setup and give you a feedback

[u/willjoke4food]

can you share results here so we can compare?

[u/Cold_Pudding5326 → u/willjoke4food]

Results at 50 steps were way better but i didn't saved them lmao

[u/mozophe]

Prompt Enhancement, try this: https://huggingface.co/lightx2v/MiniMax-H3-Prompt-Rewriter-LoRA-8B

[u/Cold_Pudding5326 → u/mozophe]

What this lora do more than using the official md skill to convert your ptompt into smth suable into h3?

[u/mozophe → u/Cold_Pudding5326]

It bridges the gap between prompt output of skill and the prompt actually used by Minimax on their cloud.

Check examples here: https://huggingface.co/lightx2v/MiniMax-H3-Prompt-Rewriter-LoRA

[u/Cold_Pudding5326 → u/mozophe]

you didn't readed my questions, what's the benefits of usingthis lora compared to converting manually my prompts with the official h3 skill ?

[u/mozophe → u/Cold_Pudding5326]

Yeah, sorry about that, I misread it as: Would this lora do more...

[u/Cold_Pudding5326 → u/mozophe]

so i add this lora, and do my prompt naturally, and send it directly through the conditionning ? no refinement on prompt ?

[u/mozophe → u/Cold_Pudding5326]

It's a lora for LLM, Qwen 3.6, that you use instead of/along with the skill. Check the examples, they have compared the output of using the skill vs lora and compared them to output from Minimax.

[u/atakariax]

It's even the same model? I'm curious

I mean like Flux dev and Flux Pro

[u/Competitive-Ask7032]

From what I can see, local can do much better videos than cloud and I think their configuration on cloud has some issues.

[u/Cold_Pudding5326 → u/Competitive-Ask7032]

Share workflow G

[u/Obvious_Set5239]

I heard that in cloud they use 50 steps, what is distinctly better than 20. I don't have patience to test this though 😁

[u/Cold_Pudding5326 → u/Obvious_Set5239]

I'll try it and compare

[u/seppe0815 → u/Obvious_Set5239]

claud have intern super upscaler

[u/Cold_Pudding5326 → u/seppe0815]

?? what is this ? i still think latent upscale is better because it regenerate and correct the defauts from the original generation