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That is H3's native notation for timed control.\n- **An image at the start** of the window becomes `first_frame`; an image marked as an **end frame** (or one that runs to the end) becomes `last_frame`. H3 anchors keyframes only at those two positions.\n- **Images in the middle**, the **reference-video track** and the **audio track** need `Refs ON (ref2va)`; they become `<Picture i>`, `<Video k>` and `<Audio j>`.\n- **Character slots** `@char1..@char3` become `<Picture i>` in ref2va, or their VLM description in fl2va.\n\n### Length and canvas\nLength snaps up to H3's **17k+5 frame grid at 24 fps** — 5 s becomes 124 frames (5.17 s). The native canvas is a 768 px short edge capped at 768×1344.\n\n### Audio\nH3 generates stereo audio **jointly** with the video, so there is nothing to inpaint. The sampler's single latent feeds both decoders. If you want your own music instead, wire the Director's `combined_audio` into `CreateVideo`.\n\n### Preview\n**MiniMax H3 Preview Override** sits between the Director and the sampler. ComfyUI's built-in preview only ever draws the *first* latent frame — this streams the whole shot while it denoises, so you see cuts, motion and timing from the first steps. Needs ComfyUI-VideoHelperSuite for the player. Bypass it (Ctrl+B) if you want the plain single-frame preview back.\n\n### Prompt output\nThe `prompt` output returns the exact storyboard text that was encoded — connect a preview node to it when a shot is not landing."],"color":"#222","bgcolor":"#000"},{"id":91,"type":"MarkdownNote","pos":[-2760,790],"size":[560,420],"flags":{},"order":3,"mode":0,"inputs":[],"outputs":[],"title":"Note: Models & sampling","properties":{"cnr_id":"comfy-core","ver":"0.30.0","Node name for S&R":"MarkdownNote"},"widgets_values":["## Models\n\n```\n📂 ComfyUI/models/\n├── 📂 diffusion_models/\n│   ├── minimax_h3_fl2va_pruned_*.safetensors\n│   └── minimax_h3_ref2va_pruned_*.safetensors\n├── 📂 text_encoders/\n│   └── qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors\n└── 📂 vae/\n    ├── minimax_h3_video_vae_fp16.safetensors\n    └── minimax_h3_audio_vae_fp32.safetensors\n```\n\n[🤗 Comfy-Org/MiniMax-H3](https://huggingface.co/Comfy-Org/MiniMax-H3)\n\n**CLIPLoader type must be `minimax`.**\n\nSampling: `res_multistep` + `simple` at ~20 steps, through `BasicGuider` (no CFG). 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