[Community] h3.c-studio — a bilingual web GUI for h3-metal

Hi Salvatore & community — first of all, thank you for h3-metal. The clean public API in `h3.h` (frame/progress callbacks, cache control, the full `h3_params` surface) made it a joy to build on.

I've put together **h3.c-studio**, the first web GUI for h3-metal, as a fork that adds a `studio/` directory without touching the engine itself:

🔗 https://github.com/skaiy/h3.c-studio

**What it does**

- 🎛 **Prompt studio** — Scene / Action / Camera / Look / Audio structured editing (Context-IR style), canvas sizes, 1–15s duration, speed/quality presets, seed control
- 🖼 **Conditioning UI** — first/last frame anchors and ordered Ref2VA reference images with drag upload
- 📈 **Live progress** — per-phase progress bar (text encode → denoise → VAE decode) with streaming logs, cancellable jobs, serial GPU queue
- 🎞 **Clip library** — auto-indexed generation history with in-browser playback
- 🔗 **Chain last frame** — one click extracts any clip's last frame into the next generation's `--first-frame`, which makes the multi-shot storyboard workflow (validated in the README tutorial) practical
- 🌐 **i18n** — 中文 / English switch

**Stack**: React + TypeScript + Vite + Tailwind frontend, FastAPI backend wrapping the CLI (moving to a direct `libh3.a` binding is on the roadmap, since the public API already exposes everything needed for in-process previews).

**Licensing**: engine stays MIT © antirez, untouched; everything in `studio/` is Apache-2.0. Model weights are not included and the README links to the MiniMax community license.

**What's next**: this is very much a living experiment. I plan to keep evolving the studio — direct `libh3.a` binding for in-process live previews, a multi-shot storyboard board, prompt templates, maybe a job queue with presets — I honestly don't know how far it will go, but I want to try, and I'll keep shipping in the open.

Feedback, issues and PRs are very welcome — and if you'd ever like to link it in the README, I'd be honored. 🙇

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**中文版**

首先感谢 h3-metal —— `h3.h` 里干净的公共 API（帧/进度回调、缓存控制、完整的 `h3_params`）让二次开发非常愉快。

我做了 **h3.c-studio**——h3-metal 的第一个图形界面，以 fork 方式新增 `studio/` 目录，引擎本体零改动：

🔗 https://github.com/skaiy/h3.c-studio

- 🎛 提示词工作室：五段式结构编辑、画幅/时长/预设/seed
- 🖼 条件输入：首尾帧锚点 + Ref2VA 参考图拖拽上传
- 📈 实时进度：分阶段进度条 + 日志流 + 任务队列
- 🎞 作品库 + 🔗 末帧接力（一键用上一条末帧做下一条首帧，多镜头叙事工作流）
- 🌐 中英双语

协议：引擎保持 MIT 不动，`studio/` 为 Apache-2.0；仓库不含模型权重。

后续计划：这会是一个持续更新的实验——直连 `libh3.a` 做进程内实时预览、多镜头分镜板、提示词模板库……说实话不知道最终会做成什么样，但想试一试，会持续在开源中迭代。

欢迎 issue / PR，如果 README 愿意收录链接，不胜荣幸 🙇

Review the repository README and the linked h3.c-studio fork, especially its README tutorial and stated licensing. Decide with maintainers whether the project should be linked, then consider the issue done when the README has the approved reference or the request has a clear maintainer decision.

Written by the indexing model from the issue text.