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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.
Oddly enough, I've done something pretty similar, but using Python + PIL instead: https://github.com/notpushkin/glitzz
Two improvements you can borrow:
1. FFmpeg can read frames from HTTP URL, which you can (ab)use to generate frames on the fly without hitting the disk
2. If you do that, you can also switch from PNG to BMP, since CPU is now your bottleneck
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