Minimax H3 ref2va + fl2va Workflow

• Simple toggle between ref2va and fl2va

• Uses stock Minimax H3 sampler settings with Spectrum for a ~30-40% speed boost

  • I have yet to find a single other combination that doesn't have some kind of worse downside - The turbo LoRAs suck.

• Motion Context video extension using save and load latents

  • How to use in workflow

  • Can lead to gamma shift after extending - may need to manually adjust brightness/contrast

• FaceRefine for fixing distant garbled faces

  • required custom_nodes that aren't on the ComfyUI Manager included in archive

• Simple postproduction settings

  • Interpolation using https://github.com/ethanfel/ComfyUI-Tween

    • GIMM VFI

    • SPEED VFI (seems better than RIFE at about the same speed)

  • Upscale

    • Tensorrt frame by frame upscale

    • RTX VSR

  • RTX Denoise/Deblur

• Postproduction looping tools for fl2va using the same first and last frame

  • clip still end or starting frames + audio

  • Smoothen out the loop with rife generated frames using Seamless Loop

• Generation Preview

• Batch or single video upscale using GIMM VFI+Tensorrt as toggle below the main workflow

  • throw your videos into any folder inside ComfyUI/input/... and toggle the batch upscale to get everything running

No workflow will help, if your prompt doesn't follow the guidelines. I recommend looking through the following prompting guides if you have no idea about Minimax H3 prompt and then use other's or my prompts as help to get started.

I added the full workflows, including prompt and resources I used in the example videos, to the workflow archive.
https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/docs/VIDEO_PROMPT_WRITING_GUIDE_base_en.md

https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/docs/VIDEO_PROMPT_WRITING_GUIDE_ref_en.md

Resources

• https://huggingface.co/Comfy-Org/MiniMax-H3/blob/main/diffusion_models/minimax_h3_fl2va_pruned_int8_convrot.safetensors

• https://huggingface.co/Kijai/MiniMax-H3-experimental/blob/main/minimax_h3_video_vae_int8_convrot.safetensors

• https://huggingface.co/Comfy-Org/MiniMax-H3/blob/main/vae/minimax_h3_audio_vae_fp32.safetensors

• https://huggingface.co/Comfy-Org/MiniMax-H3/blob/main/text_encoders/qwen3vl_32b_minimax_h3_int8_convrot.safetensors

• https://huggingface.co/Kijai/MiniMax-H3-experimental/blob/main/loras/minimax_h3_ref_lora_rank_256_bf16.safetensors

• https://huggingface.co/lightx2v/Minimax-h3-Turbo/blob/main/minimax_h3_fl2v_turbo_8step_v1.0_comfyui_bf16.safetensors

• for low VRAM/RAM users

  • https://huggingface.co/Kijai/MiniMax-H3-experimental/blob/main/minimax_h3_fl2va_pruned_w4a8_mixed.safetensors

  • https://huggingface.co/Kijai/MiniMax-H3-experimental/blob/main/minimax_h3_ref2va_pruned_w4a8_mixed.safetensors

  • https://huggingface.co/Comfy-Org/MiniMax-H3/blob/main/text_encoders/qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors

Thanks to

• https://github.com/Carasibana/ComfyUI-H3-FaceRefine

• https://github.com/NikoDemon80/ComfyUI-H3-Motion-Context

• https://github.com/xmarre/ComfyUI-Spectrum-MiniMax-H3