Bug report
Using minimax_h3_video_vae_int8_convrot.safetensors with the MiniMax H3 workflow produces an entirely black video. The same workflow works with minimax_h3_video_vae_fp16.safetensors.
Reproduction
- ComfyUI: current local build
- Model: MiniMax H3
- VAE:
minimax_h3_video_vae_int8_convrot.safetensors
- GPU: RTX 2080 Ti, 22 GB
- Resolution: 864×480
- Length: 362 frames
- Sampling: 4 steps
- VAE path: native H3 spatial and temporal tiling
The output video is completely black. The log also reports:
RuntimeWarning: invalid value encountered in cast
This occurs while converting the decoded video tensor to 8-bit output, suggesting that the VAE output contains NaN or Inf values.
Relevant log information:
VAE load device: cuda:0, offload device: cpu, dtype: torch.float32
Requested to load MiniMaxH3VideoVAE
[VAEDecode] shape=(1, 24, 107, 30, 54)
The INT8 VAE file was loaded successfully, but the decoded output is invalid.
Could you please check whether this INT8 ConvRot VAE requires a specific ComfyUI, comfy-kitchen, dtype, attention backend, or loading configuration? Is this checkpoint compatible with the current MiniMax H3 VAE loader on RTX 2080 Ti/SM75?
Bug report
Using
minimax_h3_video_vae_int8_convrot.safetensorswith the MiniMax H3 workflow produces an entirely black video. The same workflow works withminimax_h3_video_vae_fp16.safetensors.Reproduction
minimax_h3_video_vae_int8_convrot.safetensorsThe output video is completely black. The log also reports:
This occurs while converting the decoded video tensor to 8-bit output, suggesting that the VAE output contains NaN or Inf values.
Relevant log information:
The INT8 VAE file was loaded successfully, but the decoded output is invalid.
Could you please check whether this INT8 ConvRot VAE requires a specific ComfyUI, comfy-kitchen, dtype, attention backend, or loading configuration? Is this checkpoint compatible with the current MiniMax H3 VAE loader on RTX 2080 Ti/SM75?