MontClip

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.