this post was submitted on 23 Mar 2024
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Easier and cheaper to get a second screen.
A professional video switcher will do this but it’s way more with “DVE” but you’re probably looking at more cost than another TV.
Also allows you to position the monitors/TVs differently for competitive gaming.
Or just get a cheap multi viewer. Sure, professional switchers and multi-boxes are thousands of dollars. But you can get a barebones one with no customization, no reclocking, no audio mixing, etc for like… $70?
You could also do it for the fraction of the cost of a second screen but way more in time if you use an FPGA and some HDMI breakout boards, it could be an interesting project but not what OP's looking for I would imagine
You could even specify eg. 1920x540 as the input resolution to move the scaling to the software side