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.
Related event: MiniMax H3 Local Tests: Fast but Flawed in Quality and Consistency(19 posts)→
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