vincentsch · Agent video maker

explainroo

explainroo is an open-source tool, made by vincentsch, that lets a coding agent turn a topic into a narrated explainer video or product demo. The agent writes a script file and a JavaScript scenes file, and explainroo does the rest. Kokoro, an open voice model, reads the script (54 voices, eight languages, no API key), Whisper times each word, and Chrome draws the frames. ffmpeg then assembles an MP4 with subtitles, chapters and a cover image. Version 0.4 added a camera that follows the narration, and 0.4.1 stops arrow and chart labels being cut off while a shot holds. It works with Claude Code, Codex, Pi and other coding agents, and runs locally without a graphics card, though the first setup downloads about 400 MB of models. It is MIT-licensed with 1,017 stars; the latest release is v0.4.1 (20 October 2026).