Cheap USB capture devices usually support a maximum of 1080p@60Hz output. If you buy a random '4k' USB capture device, it probably supports up to 4k input but then scales it down to 1080p for output.
So perhaps 4k upscaling on the ipad will make the image look better.
I'm using an Elgato CamLink 4k at 1080p60 for now & I'm wondering if the awful mouse feel in Linux (with a Mac for display) is maybe due to delay. Going to get a cheap-ash monitor to simplify. I thought it would be nice to have my 6k Pro XDR display have windows from all computers, but it's just too messy.
I presume this software has two users → those wanting to read text on a server, and those wanting to use their iPad as a screen to watch movies from a DVD or similar player.
I did that just last week to install Linux on a micro-PC I have. Its only display output is HDMI and I didn’t want to unplug it and move it over to my TV just for the short time necessary to install a base system + SSH.
Worked great!
I’ve used the app for other things too. It’s a great solution if you already have an iPad.
https://orion.tube/