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Comment by formerly_proven | Hacker News Reader

Normally you can leave live view (768x512 resolution, 0.4 MP in this case, usually not much higher for modern cameras) running indefinitely. Besides the low resolution especially on older cameras the readout for live view will use pixel skipping to conserve power at the expense of quality. This is why "the pro streamers" don't use the live view image, but instead go the HDMI-to-UVC route using the camera's video mode.

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Unfortunately most cameras do not provide "clean" HDMI output. That is, the HDMI output contains camera UI symbols like focus points, battery state, lighting, etc. Configuration options to disable those UI symbols are generally not available, at best one can disable some of them. A model with "clean" HDMI is usually more expensive and you have to explicitly look for it as a feature.

Live view readout via USB is something that works far more often than HDMI.

I’d expect pretty much any system camera from the last decade should include it

You are definitely expecting something that the camera makers' market segmentation does not provide. If you need clean HDMI, you can buy a camera that has it, but I estimate only a quarter of currently available DSLRs do.

Most cameras do? Especially if bought in the last ~5 years.

Nikon D750 also can do it, 2014.

You can sort-of "clean" whatever output you get from your camera because the symbols are typically around the periphery. Adjust focus+zoom so that your subject is within the rectangle that doesn't have symbols, take the camera output and put it through OBS with a crop filter and you've got something that's clean.

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