phew, 49 cameras would be a 7x7 matrix. maximized on a 4K screen, 3840x2160, thats going to be 548 x 308 each. best to use substreams for that sort of previewing. adding one more to 50 means a 10x5 or a 8x7 with a bunch of blank slots.

if you record the raw bvr stream instead of transcoding to mp4 or something else, it will take a lot less CPU power. transcoding H265 on the fly is *expensive*