If all else fails I can just record a PDP-11/70 front panel with the blinking lights and play it on a loop.
I tried OBS Studio and got terrible screen flicker. So I downloaded SimpleScreenRecorder and when I started it, it said…
“SimpleScreenRecorder has detected that you are using the proprietary NVIDIA driver with flipping enabled. This is known to cause glitches during recording. It is recommended to disable flipping. Do you want me to do this for you?
You can also change this option manually in the NVIDIA control panel.”
So I did and it recorded perfectly. So that’s probably OBS Studio’s problem too.