You can use a laptop or a PC. We use Mini PCs for less than $200.
https://obsproject.com/ is a Broadcasting software which is free and very powerful.
https://www.elgato.com/us/en/p/cam-link-4k - has an HDMI input
You design everything in OBS and then add your Camera Link input to wherever you want depending on your design.
That’s all you need.
Now if you want to do something really cool, you can setup a Digital Signage server as a service.
It’s free and it’s what use can use for digital signage. I would recommend your brand it as it’s pretty cheap for a license.
They support Windows, Android, Tizen, WebOS, Linus for players.
You can use a Windows player with the Cam Link, Xibo has a “Video In” feature. So the customer could design whatever they wanted from anywhere as it’s web based and they could added their “Receiver/Input” for whatever video feed they wanted.
