vid-product-launch

Generates a narrative MP4 product launch video from a product description and launch context. Pipeline: HTML/CSS animations → headless Chromium (Playwright, frame-by-frame) → FFmpeg (H.264 MP4). No React. No AI video APIs. No Python. Zero runtime cost beyond Playwright + FFmpeg.

Critical Rules (read before every generation)

The tagline is not optional. Do not skip it. It is the product's entire promise in 4–6 words. If the user did not provide it, derive one from the description — a sharp, active-voice distillation. Never write "[tagline here]" or leave it blank.
The reveal moment must feel earned. The tease and build sections exist to create tension. If the product name appears in the first 20% of the video, the narrative collapses. Never reveal the product name before the Reveal section.
product_name font size: minimum 120px for 16:9, minimum 80px for 9:16. The name must be the largest element at the reveal moment. If it isn't dominant, the reveal fails.
One proof stat. Not a list. If the user provides multiple stats, pick the strongest one. A list of 5 numbers destroys the punch. One oversized number creates it.
Use window.renderFrame(t) — no CSS @keyframes for scene transitions. CSS currentTime seeking is silently ignored for backward seeks in Chromium. The renderFrame function computes element styles directly from milliseconds. Playwright calls it once per frame.