promo

Write a VHS .tape script describing the terminal session with Type, Enter, and Sleep commands, then run vhs demo.tape to render a GIF or MP4. Give Sleep enough time for real command output by timing an actual run first.

Capture raw screenshots with Playwright launchPersistentContext at 2x deviceScaleFactor, then composite them in an HTML canvas at exactly 1280×800 with rounded corners, shadows, and headline text. Render the canvas with headless Chrome for the final image.

GitHub social preview images must be exactly 1280×640 pixels and are uploaded in repository Settings. OG/Twitter cards use 1200×630, and README hero images should be exported at 2400×1260 for 2x sharpness.

Use the two-pass palette method: first run ffmpeg with palettegen to build a color palette, then run again with paletteuse combining the video and palette. This produces far better quality than direct conversion at 12 fps and 960px width.

Yes, use launchPersistentContext with recordVideo enabled and load the extension via CDP, since Chrome 137+ removed --load-extension. Host permissions must be re-granted each launch using developerPrivate APIs because session-level installs reset optional permissions.

Generic prompts produce cluttered, oversaturated results. Write prompts as briefs specifying purpose, single-focal composition with negative space, brand-derived colors, and a negative list banning text, watermarks, neon, and glossy 3D looks.