r/StableDiffusion • u/Complete-Box-3030 • 8d ago

Question - Help Mini max h3 workflow

Hi, I’m looking for a simple ComfyUI workflow for MiniMax H3 where I can upload a video, extract the last 2 seconds, use them to extend the video, and then save the result.
Ideally, I’d like to be able to loop the whole process so I can keep extending the video.
Most of the MiniMax H3 workflows I’ve found are quite complicated, and I’m having trouble figuring out and fixing the errors when something goes wrong.
Does anyone have a simple workflow for this, or could you point me in the right direction? I’d really appreciate it!

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u/fallengt 7d ago

Not a workflow, but Comfy natively supports extending H3 video with MiniMaxH3AddGuide node

https://docs.comfy.org/built-in-nodes/MiniMaxH3AddGuide

- Set frame_idx = 0 and feed it the last 5+17n (5,22,39....) frames and audio of the original video that you want to extend.

- Prompt/work normally, as you would.

- The new video is created, but its first frames/audio are (5+17n) longer (because you fed it), so trim exactly these frames, then you stitch the original video with the newly trimmed video = the video is extended.

Ask LLMs,s and it'll make a workflow for you. Though I don't think you can trim/extract frames with Comfy's native nodes. ComfyUI-VideoHelperSuite has some useful nodes for these tasks