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SuperConductor
A playout client for Windows/Linux/macOS that will let you control CasparCG Server, BMD ATEM, OBS Studio, vMix, OSC-compatible devices, HTTP (REST)-compatible devices, and more!
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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.
In SuperConductor drag a piece of media (make sure scanner.exe is running, maybe use CasparLauncher to run them together) onto your timeline and then change the type from MEDIA to IP and then enter the NDI address in this format "ndi://computername/Test Pattern" with no quotes. It will add the quotes for you when it sends the command. Then you can make groups for your different SDI outputs and set the group to One part at a time mode, and then on each of your timeline objects for the NDI inputs you can delete the duration which will make it infinite. Set each group to be for a different Casparcg channel so you can then swap what is on your various SDI outputs.