If you stream with OBS with multiple cameras on Linux, you might notice that cameras are loaded as they are detected during boot. You probably don't give it much thought, normally, but if you have a permanent streaming setup with complex OBS templates, you need to know which camera in the physical world is going to show up in which screen in the virtual one. In other words, you don't want to assign one device as Camera A today only to have it end up as Camera B tomorrow.
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