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Stefan HallerandClaude Opus 5
8c1852e074
Record demos with vhs and publish them to GitHub's attachment store The demo gifs in the README start on their own, loop without telling the reader where a run begins, and give no way to pause, seek or replay. A video with the browser's own controls fixes all three, but GitHub plays a video in a README only when it is served from its own attachment store. If you commit one to the assets branch and link it the way we link the images, GitHub drops the whole <video> element when it renders the page. Replace terminalizer with vhs. vhs records the demo straight to mp4 rather than going through a gif, and it takes the terminal size, font and colours from demo/settings.tape. Then upload the result from the endpoint that GitHub's own drag-and-drop upload posts to, and print the tag to paste into the page. Uploading alone is not enough. An attachment is readable only by people who are signed in to GitHub until a posted comment in the repository refers to it, and a README on a branch does not count. So post each recording to a collecting issue and wait until the video can be fetched without a token. Miss that step and the video plays for whoever recorded it and 404s for every other reader. Pad the bottom of the frame as well, because the browser draws its playback controls over the video and they are tall enough to cover the line where the demos put their captions. The recording is sharper and smaller than the gif it replaces. It runs at 1866x1290 and 25 fps for 304K, against 1140x828 and about 5 fps for 461K. It also costs the reader nothing until they press play, whereas the gifs are fetched every time the README is opened. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>