Timeline Studio: Open-Source AI Video Editor That Runs Entirely in the Browser

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A developer has built Timeline Studio, an open-source, local-first AI video editor that processes media directly in the browser rather than uploading footage to remote servers. The tool supports multi-track timelines, captions, voiceovers, visual effects, and offline export, using WebGPU and WebAssembly for AI inference. To manage large AI models efficiently, the editor lazy-loads them only when a feature is first used, caches them via a service worker, and mirrors files across Hugging Face and ModelScope for reliability. Models are pinned to specific versions so upstream changes cannot silently affect editing workflows, and a shared cache identity ensures fallback downloads do not duplicate files on the user's device. Export quality is kept consistent by treating the timeline as declarative state and using a dedicated offline rendering path, rather than simply recording live on-screen playback.

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