So how does this black magic work? How does dual PC streaming using NDI operate? Without getting into too many technicalities what NDI does is allow you to transmit a video source over your local network in high quality and low latency. In our case specifically, we use NDI and its over-the-network capabilities to transmit the OBS preview screen from one machine to another. What this means is that NDI basically allows you to create a clone of whatever your OBS is seeing and hearing on your gaming PC, and transfer it to your streaming machine over the network. No capture cards, no audio interfaces, no complicated wires – everything is done with a couple of clicks and downloads!