WebMotion

What it does

Compose video in the DOM, encode it with WebCodecs, download an MP4. No FFmpeg, no headless Chrome, no render farm. Every frame is a pure function of the frame index.

Everything visible is a pure function of the current frame. Nothing reads the wall clock: no Date.now() , no Math.random() , no requestAnimationFrame timestamps. Give the renderer a frame index and it draws exactly one image. That single constraint is what the rest rests on. Seeking is exact because there is no state to wind forward. Frames are cacheable because a frame is determined by its index alone. And the export is trustworthy because the encoder walks frames far faster than wall time without anything drifting, so the MP4 is the preview, pixel for pixel. Rendering happens in the tab you are reading this in, so the honest way to report speed is to let you measure it. Each case below…from webmotion.superhq.ai

In the maker’s words, at launch

Hi HN! I have been building WebMotion, a small library for making videos in the browser. The basic idea is that everything on screen is a pure function of the current frame, so rendering frame N always produces the same result. That means you can seek anywhere in the timeline, and exports are frame accurate without…

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