I use NewTek NDI and here's the basic: Your Streaming PC is running an independent source for NDI just like you would have your screen capture/audio/image/game, etc. So anything you do on your Main Output (your Main PC OBS) will show; if you add another scene or what not. If you have another monitor hooked up to the Main PC that, for example, Powerpoint is projecting to, then you just set OBS to capture the other screen since you can designate the screen to capture or program to capture. I personally tell it to capture my other monitor that way I can use the source for other things I want displayed without adding another source.
Now, you CAN add sources and such to your Streaming PC's OBS as well, but it's really best just to have everything set up on your Main PC and let the Streaming PC mirror it since you're controlling everything from your Main PC anyway.
TLDR: Anything you do on your Main PC OBS will be reflected in your Streaming PC's OBS via NDI, but not visa versa. . Just designate a new scene or source to capture the info you want on Main PC.
Did this answer your question?
