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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.
There'd have to be significant changes since I used handbrake, not ffmpeg, for these encodes. It looks like the handbrake devs are reluctant to add VAAPI support, at least based off a cursory glance. So that means converting handbrake presets to ffmpeg commands. Not the end of the world, but not easy either.
You can find my encoding/calculation scripts, encoder presets, and ramblings at this github repo. In short, I selected 9 videos to serve as "sources" for comparison:
I'm using the Tdarr_Plugin_MC93_Migz1FFMPEG plugin with bitrate_cutoff 7000, enable_10bit and enable_bframes set to true, and force_confirm set to false. The end of the code in that link has the exact settings being used after parsing the user inputs.