FableCut - the browser video editor AI agents can drive

This reel was edited by Claude Code, live.

No timeline dragging, no keyframing by hand. An agent wrote project.json in a real session while the browser reloaded in real time. What you see is the actual output.

Music: Digital Lemonade by Kevin MacLeod, CC BY 4.0.

How does an AI actually edit my video?

If you cut video but have never let software do the cutting, here is the whole idea in three steps. No coding required to follow along.

01

You describe the edit

Ask in plain language: cut this to the beat, drop in a title, grade it cinematic. An agent is simply software that reads your request and acts on it.
02

It writes the timeline

Your whole edit lives in one text file, project.json: clips, tracks, effects, keyframes, transitions. The agent edits that instead of clicking around.
03

You watch it happen

The open editor reloads in about 150 milliseconds. The timeline updates in front of you. Nudge anything by hand, then export when it feels right.

The project file is the interface.

Most AI video tools hide the edit behind a black-box API. FableCut does the opposite: the timeline is a plain document, and anything that can write it can edit video. A human and an agent can work the same timeline at once.

MCP serverClaude Code, Claude Desktop, or any MCP client drives it with typed tools.
project.jsonEdit the file directly. The UI hot-reloads over server-sent events.
REST APIPlain HTTP for media, analysis, live-reload and export.

project.json

{
  "fps": 30, "width": 1080, "height": 1920,
  "clips": [
    {
      "kind": "video", "track": "V1",
      "start": 0, "in": 2.5, "duration": 3.4,
      "props": { "filterPreset": "teal-orange" },
      "keyframes": {
        "scale": [{ "t": 0, "v": 1 },
                  { "t": 3.4, "v": 1.18 }]
      }
    }
  ]
}

A real editor, not a toy.

Everything a modern reel needs, drivable by hand or by an agent.

Motion that reads like a pro cut

Keyframe 25+ properties with easing. Speed ramps that time-remap the video and the audio mix together. Camera shake and RGB-split, both animatable. 17 transitions from clean fades to whip-pans and glitch.

12

Filter presets, from cinematic to cyberpunk, plus full grade controls and Premiere-style adjustment layers.

AI background removal

In-browser person cut-out via MediaPipe. Green-screen chroma key with spill suppression too.

Kinetic captions

Typewriter, word-pop, karaoke, letter-pop, wave and bounce. Neon glow for the short-form look. Any Google Font by name, or drop in your own.

FableCut

Reference remake

Hand it a reel you like. It detects shots, beats, BPM and the drop, then hands back an edit blueprint.

Animated SVG clips

A first-class svg kind, rendered frame-accurately from CSS keyframes. Author your own stickers and lower-thirds.

7 tracks, snap markers, real waveforms, and ffmpeg export

Four video and three audio tracks, multi-select and split, beat markers you can tap on the fly, decoded audio waveforms, and CRF-18 MP4 export that renders each frame through the same compositor you preview with.

Up and running in under a minute.

Node 18+ and a Chromium browser. ffmpeg on PATH is optional but recommended for fast export.

Run the editor

git clone https://github.com/ronak-create/FableCut.git
cd FableCut
node server.js

Opens at http://localhost:7777. Since v1.3.1 it binds to localhost only.

Let an agent drive it

claude mcp add -s user fablecut -- \
  node "/path/to/FableCut/mcp-server.js"

Registers the MCP server for every Claude Code session. Full setup in the README.

Star it on GitHub Read the full manual

Latest release

Fetching the newest version from GitHub.

Release notes Changelog

The browser video editor AI agents can drive.