Velocut
Open-source video editor that runs in Chrome or Edge, keeps media and rendering local, and lets Codex edit timelines and 3D scenes.
Velocut is a local-first video editor and 3D scene studio for people who want to edit by hand or delegate work to an AI agent. It runs in Chrome or Edge and is open source under the MIT license. Media storage and rendering stay in your browser; AI observations and optional cloud features send relevant data to your chosen model or provider.
Manual edits and Codex use the same project and undo history. You can inspect who made a change, undo it, or branch from an earlier state. Revision checks reject AI edits based on an outdated scene, which matters when you're working alongside an agent.
The multitrack timeline supports trimming, speed changes, transitions and audio mixing. Titles, captions and motion graphics remain editable, with keyframes for movement and volume. The 3D Director lets you compose scenes with geometry, GLB models, characters, lighting, physics and cameras.
Optional generation services can create video for a timeline range from text or a first frame. You can compare candidates before placing one in the edit, and saved provider jobs resume after a project reload. Model definitions support services including MiniMax and Seedance. These services use your provider account; manual editing and the Codex integration need no additional model API key. The separate built-in Assistant uses an Anthropic-compatible provider.
The editor requires Node.js and a browser with WebGPU and WebCodecs. It exports MP4 through the browser, with available codecs determined by browser support. Projects and their edit history persist in local browser storage.
