oh-my-cassette

⚡ Install in 30 seconds

# Claude Code
claude plugin marketplace add Cassette-Editor/oh-my-cassette
claude plugin install oh-my-cassette@cassette-editor

# Codex
codex plugin marketplace add https://github.com/Cassette-Editor/oh-my-cassette.git
codex plugin add oh-my-cassette@cassette-editor

Restart your agent, then say: "Edit the clips in ./footage into a 30-second travel vlog with beat-synced cuts."

Want to try the workflow before installing? Open the public web demo.

Needs Python 3.11–3.13, ffmpeg, and a Cassette account. Full setup — including OpenCode, Hermes, and any other MCP host — is in Quick Start.

🎥 Overview

Oh My Cassette is an open-source AI video editing plugin and local MCP server for Claude Code, Codex, Hermes Agent, and OpenCode. It turns natural-language chat into finished montage videos on Cassette — beat-synced cuts, auto-matched music, subtitles, transitions, and picture-in-picture — with minimal token overhead.

The agent does the parts that make editing tedious: it watches every clip, picks the shots, plans the cut, syncs it to the beat, and renders — while you stay in chat. Because it runs through your agent, you can do all of it from your phone.

🖥️ How it works

Upload your clips, describe the video you want, and the agent edits it.

Time	What happens
0:09	The brief — one line, style left entirely to the agent, typed into Claude Code
0:22	15 files upload to Cassette; every clip is analyzed for scene content
0:35	The agent edits on its own — shot selection, title card, lower-third, grading, beat-synced cuts
0:58	The timeline comes back as a readable digest, with a clickable contact-sheet link
1:03	One cmd+click opens the real contact sheet — one frame per clip, zero render
1:12	The contact sheet itself: what the cut looks like before a single frame is rendered
1:44	The export lands, and the runtime measures it — duration, black frames, audio levels
1:52	The finished cut

The cut it produced

The screen recording is compressed to keep this page light, so the terminal text looks softer here than it does on your machine; the cut below it is the full-quality render. Prompt to rendered file took 9 minutes 53 seconds of real time, sped up above. A person's face is pixelated in both the screen recording and the cut it produced, for privacy — that blur is not something the agent added.

Token cost: that session used 55K output tokens and 2.33M billed input tokens (2.07M of them cache reads) on Claude Opus 5 — roughly $4 at API list price, measured from the Claude Code transcript of this exact recording. One brief, one turn, start to exported file. The editing itself runs on Cassette, so the agent only pays for the brief and the timeline digests, not for the footage.

🎬 Case Videos

Every case below was edited end-to-end by an AI agent through Oh My Cassette, from the exact prompt shown — real inputs, real processing times, and the output is what the agent delivered.