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In theory, you might be able to do it at no cost by compositing 4 different screens into one on OBS Studio and then outputting that feed through a single hdmi into your TV. It all depends really on what screens you need to capture, to what extend you need to interact with them, and if your computer will be able to handle it.
Affordable 4k HDMI Multiviewer suggestions (<£500) For the last few years, I've been using a basic 1080p HDMI 4x1 multiviewer (~£80) and it's been working great for what it is. As I'm due to replace my old TV for a new 4k TV very soon, I'll have to upgrade my cables and of course the multiviewer.
The new Blackmagic MultiView 4 HD model is a low cost multi viewer that lets you simultaneously monitor 4 different SDI video sources on a single display! Each view is a completely independent video monitor with overlays that you can turn on and off such as custom labels, audio meters and more.
gofanco 4K 4x2 HDMI MultiViewer with Dual Displays – 4 Inputs & 2 Outputs, 4K @30Hz, Seamless Switching, Quadview & Quad/Dual/Single Modes, Mirrored/Matrix Outputs, Audio Extract (QuadView4K-Dual)
Supports Blackmagic Smart Control and Blackmagic Master Control hardware panels. Includes Blackmagic Videohub SDK and Ethernet Videohub Control Protocol. MultiView software included free for Windows™ and Mac™. MultiView 16 settings preserved and restored instantly at power on.
This 4 input x 2 output multiviewer was developed for the purpose of supporting higher input and output resolutions up to (4K@60) for multiple sources on a single screen. USB Capture: Connect to the built in USB 3.0 UHD video capture to output 4K video to a computer for recording or streaming.
External Software Control. Get full control from your Mac or Windows computer. Blackmagic MultiView 4 and 16 can be connected to a standard Ethernet IP network and uses Bonjour so it’s automatically recognized by Mac and Windows computers running the control panel software!
