# MontClip

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Yongbing Tang](https://cerebralvalley.ai/u/EddieT1024)
- **GitHub:** https://github.com/good-night-oppie/MontClip
- **Demo video:** https://github.com/good-night-oppie/MontClip/releases/download/meta-hackathon-demo/MontClip-Meta-Hackathon-Demo-v2-65s.mp4
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4333

MontClip is a desktop video editor for streamers who cut their own streams. A four-hour stream becomes a few short clips, and the streamer usually does that alone, after the stream, tired: finding the moment, trimming pauses, adding captions, checking it again.

With MontClip the streamer quotes subtitle lines or selects a range and asks in plain words, for example "keep only these two sentences" or "delete 3 to 5 seconds". Muse Spark (muse-spark-1.1 on the Meta Model API) returns tool calls that MontClip turns into real edits on the project timeline, not a text answer to carry out by hand.

The creator stays in control:
- Before anything is sent, a review box shows the destination (api.meta.ai, muse-spark-1.1) and the complete request: their messages, any quoted subtitle text, and numeric timeline facts (clip IDs, durations, trim points, optional highlight scores). No file names, paths, video or audio are included.
- They choose when edits need approval. In Manual mode edits wait for approval, either for one edit or for this kind of edit in the current chat.
- Every applied edit is a single undo step, so one Undo takes it back.
- Recordings stay on the computer, and the editor works fully without any AI service.

Around it is a full editor: multi-track timeline, sentence-by-sentence keep/cut from subtitles, local Chinese transcription, and MP4 + SRT export with a bundled LGPL FFmpeg. Chinese first, English one click away. Open source (MIT).

The hackathon write-up with screenshots and an honest list of what is and isn't done is in docs/hackathon/ in the repository.

The full Muse Spark walkthrough (quote, request, review, approve, apply, Undo; 3 minutes): https://github.com/good-night-oppie/MontClip/releases/download/meta-hackathon-demo/MontClip-Meta-Hackathon-Demo-720p.mp4

Demo video credits: no voice-over. Music is instrumental, generated for this video with Google Lyria 3 Pro (preview) via OpenRouter on 2026-11-05 and used under those providers' terms. Screen recordings are real runs of MontClip; the streamer footage is used with the streamer's permission. Title cards were made by us (Noto Sans CJK font). The 3-minute version's narration is the owner's own voice, cloned with ElevenLabs with the owner's permission; its music is original and released under CC0.

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