nexu-io/html-video — reverse-engineered prompt

Build me a local app that turns a plain idea, an article link, or a GitHub repo into a polished animated video and exports it as a real MP4 on my computer.

I want a simple browser studio where I can paste the source, pick from a gallery of video styles like data charts, product promos, title cards, explainers, and outros, then let my coding agent generate the storyboard and animated HTML scenes. I should be able to preview the scenes, edit the text in each scene, reorder them, and render again without starting over.

Please make the rendering happen locally using a browser capture flow and ffmpeg, with no cloud rendering or per video fees. Include a basic command line option too, so I can script the same flow. If possible, add optional narration and background music that gets mixed into the final MP4.

Make it friendly for Cursor, Claude Code, Codex, and similar agents. Look up current docs online if you need to.