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The prompt is where H3’s multimodal training pays off: shots, camera moves, dialogue, and sound effects all live in one prompt block. This page collects the prompt writing resources for MiniMax H3 in ComfyUI: MiniMax’s official guides, general tips that apply to every workflow, and prompt embeddings for style effects.

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Official guides

MiniMax publishes two official prompt writing guides:
  • Base generation modes (T2VA, I2VA, FL2VA, L2VA): structure a prompt into timed shots with camera movement and audio (dialogue, SFX, music), with examples for each mode
  • Full-reference mode (R2V): the rewrite output structure, including subject definitions, reference labels, and retention analysis, and how to assign each reference a role in the target shot
MiniMax also publishes installable H3 skills, including a prompt-writing skill that packages these guides for agent use. The workflow pages show these guides applied to each template: T2V and I2V, R2V, Multiframe Reference, and Fun ControlNet Union.

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General tips

  1. Describe the whole scene: State the overall scene first (location, character, what is happening), then break it into timed shots
  2. Shots, camera, and audio: Describe the shots, camera moves, and the accompanying audio (dialogue, SFX, music) in one prompt block
  3. Resolution: H3’s native canvas is a 768px short edge, which is 1344x768 at 16:9, and resolutions are rounded to a multiple of 32. See Setting the output resolution
  4. Duration: The duration input snaps to the model’s 17-frame-per-block (17k+5) grid at 24fps
Workflow-specific prompting (reference tags, timeline anchors, control-video length) is covered on each workflow page.

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Prompt embeddings

Comfy-Org/ComfyUI#15697 added support for prompt embeddings in MiniMax H3. You can use ComfyUI’s standard embedding: syntax in H3 prompts. Place an embedding file in ComfyUI/models/embeddings/ and reference it in the prompt by name, for example embedding:my_embedding. The embedding is loaded and mixed into the text conditioning just like with any other ComfyUI model. The Comfy-Org/MiniMax-H3 repository hosts 10 style embeddings in its embeddings folder. These files are unofficial: they were contributed by community member silveroxides via Hugging Face PR #50, and were not produced by Comfy-Org or MiniMax. The original files are in the silveroxides/MiniMax-H3_tests repository. The file name describes the intended effect, and the trigger word is the file name without the extension: