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Generation, training and LoRA distribution on Civitai are covered by Civitai’s own license agreement with MiniMax. If you download these weights and run them yourself, your use is instead governed by the MiniMax H3 Community License Agreement, whose grant excludes the European Union, the United Kingdom, the Republic of Korea and the United States of America.
MiniMax H3
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-videoRestart 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.
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。
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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