Open Source ComfyUI Nodes: Fixing MiniMax H3 Fast Motion Artifacts
MatlowAI · reddit · 2026-08-09
A developer released a set of custom ComfyUI nodes, ComfyUI-MAINodes, to address motion artifacts in the MiniMax H3 video model during bursty movements.
- Root Cause: A single latent token in H3 spans 4 frames, making it unable to support rapid pose changes within that timeframe. Simply re-running denoising does not fix this.
- Solution: A "jerk oracle" reads the clip's latent to identify points of extreme acceleration. The clip is retimed with held frames at these specific spots, regenerated via video-to-video at partial denoise, and then the held frames are dropped to recover exact realtime playback. Audio is jointly regenerated and retimed using the same map while preserving pitch.
- Performance: Tested on an RTX 6000 Pro, the author notes that mixing in turbo loras for time savings wasn't worth the quality trade-off, recommending it only for drafting prompt performances.
Related event: New ComfyUI Plugin Fixes MiniMax H3 Video Artifacts(2 posts)→
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