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remotion
Discontinued 🎥 Create videos programmatically in React [Moved to: https://github.com/remotion-dev/remotion] (by JonnyBurger)
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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I have no idea if this would meet your needs, but you mentioned that you've used ffmpeg and this library claims to bring ffmpeg to the browser - https://github.com/ffmpegwasm/ffmpeg.wasm
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