PromptMotion MCP

PromptMotion turns one ChatGPT request into a complete 3–6 minute product presentation video. ChatGPT supplies the strategy and scene plan; a purpose-built Canvas/Web Audio engine previews, combines, and exports every scene in the browser.

No OpenAI API key. No Remotion. No paid renderer. No uploaded frames.

How it works

one product brief
      ↓
ChatGPT plans the narrative + complete VideoIR
      ↓  one produce_video call
Cloudflare Worker validates and normalizes the timeline
      ↓
PromptMotion Studio renders locally with Canvas + MediaRecorder
      ↓
one continuous MP4/WebM download in each selected aspect ratio

The Worker performs lightweight validation only. Rendering stays in the user's browser, which keeps the hosted component compatible with free-tier limits and avoids storing creative assets.

Related MCP server: Agent Demo Studio

Supported outputs

Run locally

Requirements: Node.js 20+ and a current Chromium browser.

npm install
npm run dev

Open http://localhost:8787 for the standalone studio. The MCP endpoint is http://localhost:8787/mcp; health is available at /health.

Deploy free on Cloudflare Workers

npx wrangler login
npm run deploy

Then replace the endpoint in .mcp.json and skills/product-video/agents/openai.yaml if your Workers subdomain differs.

Connect from ChatGPT

1. Deploy the Worker and copy its HTTPS /mcp URL.

2. In ChatGPT developer mode, add a custom MCP connector using that URL.

3. Ask for a full product video in one message, including a website/brief and desired platforms.

4. ChatGPT calls produce_video once. Use the embedded studio to preview and render the final file.

Example request:

Create a 3-minute cinematic launch video for our B2B payments platform. Audience: finance teams. Goal: free trials. Make YouTube 16:9, Instagram Reels, TikTok, and LinkedIn square versions. Use violet and mint, modern but credible.

Commands

npm run build     # embed the widget and type-check the Worker
npm test          # validate timeline and preset behavior
npm run check     # build + all tests
npm run deploy    # build widget + deploy Worker

Important constraints

• Export is real-time because the browser records the animated canvas as it plays. A 3-minute film takes about 3 minutes per selected output.

• MP4 availability depends on the browser's MediaRecorder codecs; WebM is the portable fallback.

• The procedural soundtrack is intentionally simple in this first release. Voiceover and uploaded media tracks are roadmap items.

• 4K rendering depends on device memory and GPU capacity. 1080p is the recommended default.

• The creative plan should use sourced facts. PromptMotion does not verify marketing claims.

Why not Vercel Hobby?

The architecture can be hosted as static assets plus a lightweight MCP route, but Vercel Hobby is limited to personal, non-commercial use. Cloudflare Workers Free is the safer default for this open project. The browser still performs all expensive rendering.

License

MIT