Oh sorry, i referencing about that site: https://spout.zeal.co/
So the most VJ apps have it. Its like an virtual audio cable but for video.
Viewing post in Ultimate Shader Playground v0.55 (Early Access) comments
It was great to record the virtual video from another app, like https://www.lightjams.com/spout-recorder.html
i would love to send the shaders into other softwares, like https://www.hypertonal.net/cathodemer/
or e.g. Adobe premiere, which have all support for input and ouput of generated materials via spout. It would be a great addition. Anyways, i think i am drifting away from your main focus ;)