Video compressor
Simon Willison built a browser-based video compressor using the WebAssembly FFmpeg build, generated by Claude Fable 5.1 in Claude Code for web.
Willison recorded a demo video of his Equal Earth animation and wanted an optimized web-publishable version. He had Claude Fable 5.1 running in Claude Code for web build a compressor around the WebAssembly port of FFmpeg. The post is a short vibe-coding demonstration, not a model release or security event.
- Tool built by Claude Fable 5.1 in Claude Code for web
- Uses the WebAssembly build of FFmpeg in the browser
- Demonstrates agentic coding for small utility creation
- Vendors
- Anthropic
- Products
- Claude CodeFFmpeg
- AI models
- Claude Fable 5.1
From the original article
Tool: Video compressor I recorded a short demo video of my Equal Earth animation on my phone and wanted to publish an optimized version of that video (using FFMPEG) on my blog, so I had Claude Fable 5. 1 in Claude Code for web build me this tool using the WebAssembly build of FFMPEG. Tags: ffmpeg , video , webassembly , claude , claude-code , claude-mythos-fable
simonwillison.net
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