Practical Guide: Fixing Character Drift in MiniMax H3 Video with Keyframe Anchoring

deependdesigns · reddit · 2026-08-09

The author shares a practical workflow for solving 3D character consistency loss (character drift) across chained video clips generated by MiniMax H3 (running locally via ComfyUI).

Core Workflow & Settings:

Environment & Parameters: Driven via ComfyUI HTTP API using the ref2va checkpoint. Recommends resmultistep sampler, 20 steps, and setting refimagesize to 'max' for fidelity (at the cost of longer generation times).

Key Techniques for Fixing Drift:

Keyframe Anchoring: Relying solely on the original reference image fails to maintain continuity. The ultimate fix is extracting the last frame of the previous clip using ffmpeg and feeding it back as an image reference for the next generation, switching the task type to "keyframe completion + reference generation."
Prompt Constraints: Explicitly require the shot to end with the full body visible (head, arms, legs, feet fully visible). A cropped ending frame will ruin the anchor for the next shot.
Less is More: In the detailed description prompt, avoid over-describing the character's exact geometry from the reference image, as it fights the reference. A simple instruction like "preserve its exact shape and proportions from the reference image" works significantly better.

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Practical Guide: Fixing Character Drift in MiniMax H3 Video with Keyframe Anchoring

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