Developer uses HTML-to-MP4 framework and AI agent to produce Chrome extension promo videos

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A developer built two product videos for a Chrome extension without using a traditional video editor, instead relying on HyperFrames, HeyGen's open-source HTML-to-MP4 framework. Compositions are written in plain HTML and CSS, with animations driven by GSAP and rendering handled by headless Chrome and FFmpeg, making the files editable by an AI agent. The developer encountered three key pitfalls: a silent failure when GSAP failed to load in a network-restricted container, audio-video drift caused by estimating narration timing rather than measuring it, and an inability to capture real UI screenshots in an isolated environment. Drift was eliminated by generating audio segments first, measuring their actual durations, and deriving cut points cumulatively, achieving near-perfect sync on both videos. The developer also resolved the screenshot issue by seeding real fetched data through the app's own cache path rather than mocking the interface.

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