It's great to see some progress being made with this very useful plugin. And thanks for the audio fix for NDI5.

I am trying to build a Windows system with a couple of NDI cameras into OBS and really struggling to get smooth frame rates. Sometimes it works fine but other times every 3rd or 4th frame is dropped. I have setup a test system with just the cameras, the receiving computer and a network switch just to check nothing else is going on .

My windows machine is a reasonably capable i7 with Nvidia 1650 graphics and nothing is maxed out according to resource monitor. Plus, NDI5 Studio Monitor is able to do a smooth recording with no frame drops. I also have vMix and that can do a smooth recording. So it really looks like some issue in the way OBS handles the incoming NDI frames.

I was looking at the NDI5 SDK and they mention using this color format for most efficient frame handling
recv_desc.color_format = NDIlib_recv_color_format_fastest;

also I wonder about
obs_source_set_async_unbuffered();
which the plugin sets to True if the low-latency option is selected.

I have tried changing these settings using the very handy build system but neither makes much difference. So I am still digging for why OBS struggles with this. There are a few open source NDI-monitor apps on GitHub which all seem to use event-based code for receiving video rather than the polling approach that the OBS plugin uses.