FableCut: Open-Source Video Editor Lets AI Agents Edit via a Single JSON File

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Developer Ronak has open-sourced FableCut, a video editor that stores the entire timeline — clips, tracks, keyframes, and transitions — in a single JSON file called project.json. Unlike most AI video tools that rely on proprietary APIs to manage state, FableCut allows both humans and AI agents to edit by directly reading and writing this file. A lightweight Node.js server watches the file for changes and pushes updates to the browser via Server-Sent Events, with a revision integer handling concurrency. Animated SVG overlays are rendered deterministically by pausing CSS animations and manually driving time via animation-delay, ensuring frame-accurate video export. The project is MIT-licensed, requires zero dependencies, and is available on GitHub.

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