MiniMax H3/Ref2Va Video Face Swap Fails in Tests

Developers testing MiniMax H3 and Ref2Va in ComfyUI report significant flaws in character replacement and facial consistency. While pure image generation performs well, video-based character replacement often fails, requiring complex workarounds and revealing limitations in fine-grained control.

Confirmed

• Weak facial restoration: badhabitaddict notes that even with high-res reference images, H3 struggles to capture and maintain facial features like Seedance does. DoctaRoboto found that complex reference images easily lose facial details in Ref2Va tests.
• Character replacement failures: CtrlAltDefeat- observed that when replacing characters in videos, the model often retains original characters or struggles with action matching. Leonviz reported unsuccessful face swaps using ChatGPT-generated prompts.
• Background alteration issues: throwaway0204055 discovered that during R2V character replacement, the model frequently fails to preserve original backgrounds even with clear video references, seemingly requiring explicit background descriptions in prompts.
• Viable workarounds: DoctaRoboto emphasizes that to ensure facial consistency, head and body must be processed separately. CtrlAltDefeat- confirms that pure image generation (without input video) works well.

Unconfirmed

• Whether the popular "multi-angle complex character sheets" in the community can substantially improve facial consistency remains questioned by DoctaRoboto, who found poor results in testing.

Why it matters

• The ability of video generation models to maintain character consistency and precise control (e.g., local replacement without background destruction) directly impacts their usability in practical workflows like post-production and advertising. Current MiniMax H3 test results show users must invest significant effort in designing complex workarounds, exposing bottlenecks in fine-grained control of current video generation technology.

2026-08-08 ~ 2026-08-10 · 5 related posts

• [source] ComfyUI Test: MiniMax-H3 R2V Struggles with Face Consistency — badhabitaddict · 2026-08-08
• [source] Testing MiniMax H3 R2V Character Swap Falls Short on Action Matching — CtrlAltDefeat- · 2026-08-08
• Minimax H3 Flaw: Why Does Character Swap Always Alter the Background? — throwaway0204055 · 2026-08-09
• Users Discuss Video Face Replacement Techniques with MiniMax H3 — Leonviz · 2026-08-09
• [source] MiniMax Ref2Va Testing: Complex Character Sheets Lose Facial Features — DoctaRoboto · 2026-08-10