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[ARTICLE · art-122732] src=simonwillison.net ↗ pub= topic=developer-tools verified=true sentiment=· neutral

Video compressor

Simon Willison released a free web-based video compressor that runs FFMPEG entirely in the browser via WebAssembly, built with Claude Fable 5.1 in Claude Code for web. The tool, available at tools.simonwillison.net/video-compressor, lets users optimize videos without uploading files to a server, and was created to publish a compressed version of a demo video for his Equal Earth animation.

read1 min views1 publishedSep 7, 2026

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

source & further reading
simonwillison.net — original article Mercator ↔ Equal Earth Research acceleration: The view inside OpenAI Using Blender with coding agents on macOS
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