Blackmagic Design - MultiView 4https://www.photocineshop.com/en/products/BLACKMAGIC-DESIGN-MultiView-4-5GSA52?cat=481
Blackmagic MultiView 4 has four completely independent 6G-SDI inputs that work with all SD, HD and Ultra HD formats up to 2160p30. Simply connect your sources and you’ll get a standard 2x2 grid view on an HD or Ultra HD television. Using the included Ethernet remote control software, you can turn on audio meters, choose which audio to output, as well as create custom labels, and more! MultiView 4 is compatible with the Teranex Mini Rack Shelf so you can use it on your desktop or rack mount it.
Each view on a Blackmagic MultiView works as a completely independent video monitor. You get full frame re-synchronization on all of the 6G-SDI inputs. That means they can be any video standard and frame rate, and each input is completely independent of the others. You can mix any combination of referenced or non-referenced NTSC, PAL, 720p, 1080i, 1080p, and Ultra HD up to 2160p30, all on the same display at the same time.