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MiniMax-H3

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I am testing MiniMax H3 with one human identity reference and a short speech-audio reference.

The same visual reference preserves identity reasonably well through ImageToVideo/FL2VA, but identity collapses when the reference is supplied through ReferenceToVideo together with audio.

Common setup

• Resolution: 1344x768
• FPS: 24
• Length: 124 frames / 5.17 seconds
• Euler sampler
• Beta scheduler
• Same source image
• Same structured reference prompt
• InsightFace buffalo_l cosine similarity used for diagnostics

Test A — ImageToVideo, visual only

• FL2VA checkpoint
• Ref2V Turbo LoRA
• ImageToVideo
• 8 steps
• No audio

Results:

• Mean similarity: 0.8855
• Minimum similarity: 0.8628

The identity is visually preserved.

Test B — ReferenceToVideo with audio, ref_image_size=match

• Same checkpoint
• Same Ref2V Turbo LoRA
• ReferenceToVideo
• One image reference
• One audio reference
• 8 steps

Results:

• Mean similarity: 0.0884
• Minimum similarity: 0.0328

The output is effectively a different person.

Test C — ReferenceToVideo with audio, ref_image_size=max

Only the image sizing mode was changed.

Results:

• Mean similarity: 0.0902
• Minimum similarity: 0.0527

Changing match to max does not recover the identity.

Test D — Native Ref2VA without LoRA

• Native Ref2VA checkpoint
• No LoRA
• ReferenceToVideo
• Audio reference
• 18 steps
• ref_image_size=max

Results:

• Mean similarity: 0.0669
• Minimum similarity: 0.0350

Using the native checkpoint and more steps still produces the wrong identity.

Observation

The failure appears to be specifically associated with audio conditioning through the ReferenceToVideo path.

ImageToVideo/FL2VA preserves the identity much better with the same visual reference, while ReferenceToVideo with audio recasts the subject.

The following did not solve the problem:

• changing match to max;
• removing the Turbo LoRA;
• increasing the number of steps to 18;
• using the native Ref2VA checkpoint.

Questions

1. Is this a known limitation of the current audio-conditioned ReferenceToVideo path?
2. Is the Ref2V Turbo LoRA intended for visual reference conditioning only?
3. Is there a recommended workflow for combining:
   • a fixed first-frame identity;
   • a separate image reference;
   • audio or lip synchronization?
4. Should audio be connected through the FL2VA/ImageToVideo path instead?
5. Are there recommended audio-shift, VAE, attention or sampler settings for preserving identity?
6. Could this be caused by an incorrect ComfyUI node connection?