MiniMax H3 ComfyUI Workflow: Complete Guide for T2V & I2V
Blog post from Atlas Cloud
MiniMax H3 is a ComfyUI video-generation workflow that produces 2K video and synchronized 32 kHz stereo audio in one multimodal diffusion pass, but it requires precise model installation, node wiring, and tensor-compatible dimensions. It supports text-to-video, image-to-video, first-and-last-frame interpolation, and reference-guided generation through dedicated conditioning nodes, using a custom Qwen3-VL text encoder and separate video and audio VAEs placed in specific ComfyUI directories. Spatial resolutions must be divisible by 32, keyframes must have identical dimensions, and clip durations must follow the 17k + 5 frame formula to avoid shape errors, truncated output, or failed decoding. Native audio is decoded through an FP32 audio VAE alongside the visual stream before both are multiplexed into a 24 fps MP4. Systems need at least 16 GB of VRAM for INT8 operation, with 24 GB recommended for 2K rendering, while an optional 8-step Turbo LoRA can substantially reduce rendering time when used with a CFG value of 1.0. Common problems including out-of-memory errors, missing audio, invalid dimensions, and unavailable custom nodes can generally be resolved through VRAM offloading, correct VAE routing, image resizing, and installation of the required MiniMax H3 node package.
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