Generate long MiniMax H3 videos from one prompt and one total duration — no manual Save/Load latent steps.

Custom nodes on GitHub: https://github.com/ooizj/ComfyUI-H3-Long-Video · also in ComfyUI Manager as H3 Long Video (Comfy Registry)

Based on NikoDemon80/ComfyUI-H3-Motion-Context. The original version chains clips by hand with Motion Context Save/Load latent nodes. This fork removes those steps: H3 Long Video (Simple) works out the segment count, samples each segment, continues from the previous video/audio latent, trims the overlap and joins everything at 24 fps in one run.

What's in the zip

• H3 Long Video - Simple.json: type the prompt directly and load the first frame and reference pictures with Load Image nodes.

• H3 Long Video - Ref Prompt Builder.json: manage reference pictures and the six Ref2VA prompt sections in a visual editor, then connect it to Long Video.

Install

ComfyUI Manager: search H3 Long Video and install; you can also pick an earlier version.

Or with git:

cd ComfyUI/custom_nodes
git clone https://github.com/ooizj/ComfyUI-H3-Long-Video.git comfyui-h3-long-video

Restart ComfyUI and refresh the browser. Requires ComfyUI 0.36.0 or newer (native MiniMax H3 and Concatenate Video). If the original H3 Motion Context is installed, uninstall it first: both packs register the same node ids.

Models: https://huggingface.co/Comfy-Org/MiniMax-H3 (diffusion model, Qwen3-VL text encoder, video VAE, audio VAE). After importing, pick your own installed models and images.

Main features

• One prompt, any length: set total_seconds (e.g. 30) and segment_seconds (e.g. 15); segments are chained automatically with picture and sound continuity.

• Reference pictures across all segments: <Picture N> references stay consistent for the whole video (Ref2VA), plus an optional first frame.

• Optional automatic prompt splitting: connect H3 Prompt API (any OpenAI-compatible API, e.g. DeepSeek) and the full-video timeline/dialogue is rewritten per segment, avoiding repeated openings and cut-off lines. Works with or without timestamps and keeps your prompt’s language. Leave it disconnected to skip it entirely — no API calls.

• Local LLMs: point H3 Prompt API at llama.cpp / llama-swap, Ollama or LM Studio. ComfyUI models are unloaded before each LLM request and unload_url frees the LLM's VRAM before sampling. In our tests a local 27B dense model or DeepSeek worked well; ~9B models are not reliable.

• H3 Ref Prompt Builder: drag/paste/reorder reference pictures, references renumber automatically, six prompt fields, optional AI tidy-up in English or Chinese.

• H3 Image & Prompt: one text box plus pictures, with local backup/load of prompts and images.

Tips

• API keys are empty in the shared files; enter your own only if you use the Prompt API.

• Shorter segments use less memory per pass but add continuation overhead.

• Questions and bug reports: GitHub Issues.

中文说明

一个提示词 + 总时长，直接生成 MiniMax H3 长视频。基于 NikoDemon80/ComfyUI-H3-Motion-Context，去掉了手动的 context Save/Load 步骤：H3 Long Video (Simple) 节点会自动计算分段数、逐段采样、承接上一段的视频和音频 latent、裁掉重叠部分，最后以 24 fps 拼接输出，一次运行就完成。

• 压缩包里有两个工作流：Simple（直接写提示词，用加载图像节点接首帧和参考图）和 Ref Prompt Builder（可视化管理参考图和六段提示词）。

• 安装：在 ComfyUI Manager 中搜索 H3 Long Video 安装（可选择版本），或在 ComfyUI/custom_nodes 下执行 git clone https://github.com/ooizj/ComfyUI-H3-Long-Video.git comfyui-h3-long-video；然后重启 ComfyUI 并刷新浏览器。需要 ComfyUI 0.36.0 或更新版本；如已安装原版 H3 Motion Context，请先卸载（两者节点 ID 相同）。

• 可选接入 H3 Prompt API（OpenAI 兼容接口，比如 DeepSeek），自动按段改写提示词（没写时间也会按剧情顺序分配到各段）；不接则不会调用任何 API。也支持本地大模型（llama.cpp / llama-swap、Ollama、LM Studio），模型可下拉选择；请求前自动卸载 ComfyUI 模型，用完通过 unload_url 释放显存。实测本地 27B 稠密模型或 DeepSeek 效果较好，9B 左右的模型不稳定。

• 导入后请换成你自己安装的模型和图片；API key 已清空。

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