Blurry MiniMax H3 First Frame? Troubleshooting Points to VAE Reconstruction Loss
sukajds · reddit · 2026-08-05
A ComfyUI user reported noticeable blurriness in MiniMax H3 video outputs, particularly losing fine details like skin textures compared to the input image.
Troubleshooting
- Ruled out H.264 compression by setting CRF to 0, which did not resolve the softness.
- Tested the VAE separately (Load Image → VAE Encode → VAE Decode → Save Image) and found the reconstructed image was already significantly blurred before any diffusion steps.
- Concluded the quality loss originates from the VAE encode/decode phase using minimaxh3videovaefp16.safetensors.
The author is seeking advice on whether specific precision settings, alternative VAEs, or workflow tweaks are needed to match the sharpness seen in official online samples.
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