Pi 4, two monitors. The monitors are not the same physical size.
Both monitors are working -- I can set different backgrounds, etc., for each.
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uname -a Linux jupiter 5.10.17-v7l+ #1403 SMP Mon Feb 22 11:33:35 GMT 2021 armv7l GNU/Linux
I'd like HDMI-1 to be the traditional monitor.
I'd like HDMI-2 to show the output of a program. In this case, it's one based on the opencv
library. Ultimately, I'd like to turn on the 2nd monitor with a relay (I know how to do that) and
run the opencv program, such that the output shows up kind of like a warning sign. I'll handle
the screen content -- I'm convinced that I can get my program to display what I want it to.
What I can't presently do is get my opencv program to open the ... what would it be?
the second monitor? second framebuffer? or do I have the opencv program run and simply
put the opened window in a specific place on the screen/desktop? I don't know how to do