> I was doing this bit using a capture card and Photo Booth on macOS which doesn’t actually support disabling the image-flip on the video feed
I use OBS to monitor my video capture. This essentially lets me use my Mac as a monitor for my headless desktop (which does not have a monitor of its own). Maximum gaming.
Deskflow lets me use my Mac as a keyboard over LAN, too. Beats remote desktop for sure. Especially when gaming.
My preferred way is ffplay(1). Last time I checked I get lower latencies than OBS at that, at least when I use `-sws_flags fast_bilinear`, which is the same scaling OBS uses by default.