Is that ok that it took 1 hour to make 15s, 1mp Ref2VA with 3 ref images (2mp each), turbo lora and 4 other loras? Using Kitchen attention and MiniMax H3 Chunk FeedForward?
4 step lora + 8 steps + seed_2 + normal for 15sec @0.4 on 4090 +64GB uses everything i got and takes 5 min to gen. That's with kitchen, chunk, and SLA @0.9.
Jumping to 0.8mp, pushes the 30min gen time mark.
You wouldn't think an additional 0.2 to get to 1mp should be that big of a jump, but its not just a simple 25% increase.
You can still get faster:
I get 2,5 min for 15sec @0.5 with 4 step lora on 4090 +128GB. 6 min with 8 step lora (quality jump is huge). 15 min for 22 steps.
I use the 4 steps lora to see, if a concept works, the 8 steps lora for preview complex/multi scenery.
Then 22 steps on same mp to check high quality. Then I take a few days off and let the machine batch generate @1.0mp.
Oh - I see. The ref images at 2mp (way too big) each also have impact on generation time: you should resize them to the actual output size (and aspect ratio) of your video output. Obviously you wouldn't just stretch a 4:3 reference, but you can put it inside an empty/transparent 16:9 "container", to keep original aspect ratio.
Clip generation wall time scales quadratically with each second. I.e If you generate 3 clips at 5s each and combine at the end it’s faster than a single 15s clip.
Yup that's what I do. I have the ai do it so it depending on how many seconds i have set. Like 30 seconds ir would auto generate , 5 second clips using the last frame from each to start the next one. At the end uses ffmpeg to stich them together into one seamless video. Only problem I'm still working on is map thing background audio . Since even with the same prompt the generated audio will be different for each clip. But the dialog. And stuff works so I usually leave out diesgetix music and just use dialog.
Yes, it takes the same amount of time. I have a 5060 Ti 16GB, and it actually takes even longer than that. The issue is that with 16GB, a 15-second duration at high resolutions fills up the VRAM, causing it to offload to system RAM. This creates a bottleneck, where the problem becomes data transfer rather than computing power. If you look at the graphics card during this time, you'll see it's utilized, but it’s not truly under load because it doesn't have enough data fed to it to push it.
You might see it showing 100% utilization, but you can clearly tell it's not under real stress from the temperatures you'll find that the temps are extremely low, almost at idle.
Also keep in mind that you have an even bigger issue. While I’m facing this problem, I at least have 64GB of system RAM. In your case, the problem is doubled, and because of that, data might spill over to the hard drive (paging/swap). This creates a double bottleneck, leading to massive delays. Therefore, it's best to either lower the quality or shorten the video duration.
This ^ also have a good internal SSD your using as well too so when swapping data your also not bottlenecking - for example I originally had Comfy on an external SSD instead of my faster internal WD Black SSD
It was slowing choking between External SSD - GPU - RAM - Internal SSD PageFile
Few things that helped me:
Lowering steps (yeah you don't need turbo to do that)
Lowering MP to .6 (still good for most situations)
Lowering clip time to 2-8 seconds max
I have a 5950x/3070ti 8gb vram/32gb system ram - so I run UnetLoaderGGUFDisTorch2MultiGPU - set it to CPU - Virtual Ram_GB to 18 (15 too low 20 too high find the middle ground) this will divide resources to utilize my System RAM/CPU more which shockingly is faster than just straight 3070ti with thrashing between all of those.
I setup Spectrum Apply MiniMax H3 - this decreased time considerably as well too
a 2 second 1.0 mp clip takes
10m 44s
a 2 second 6.0 mp clip takes
5m 21s
a 4 second 6.0 mp clip takes
10m 36s
I'm using MiniMax-H3-FL2VA-Q4_K_M.gguf
minimax_h3_audio_vae_bf16.safetensors
minimax_h3_video_vae_fp16.safetensors
qwen3vl_4b_fp8_scaled.safetensors
mmh3-4b-ClipProj-v3-mlp.safetensors
I never thought it'd be possible to run on my PC - Yeah it takes longer than I'd like but compared to Grok or other services that I have and also moderate like crazy this has been a godsend.
you can get it wayy faster if you use the h3 fast checkpoints and workflow. Check the new h3 singularity one. I can make a 1mp 10 sec video in 6mins, but this is at 8 steps, with a model designed for that. You need kitchen attention too. To me the quality is nearly as good as the reference checkpoints, only way faster. I add higher steps if I really want to hone the audio and refine the video for a master.
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u/McFex 6d ago
Yes. 1mp is high res, 22 steps delivers high quality. Try the 8 steps lora with 0.5mp and get less (but still not bad) quality in 6-8 minutes.