1

is that a command to type in terminal that lists all the webcams connected to my computer? Maybe using ffmpeg package?

2

The ioreg and system_profiler Will enumerate connected USB and other devices should you have a FireWire or other bus for a camera.

Sadly, ffmpeg won't see the path to these devices as described here:

At least you'll have a starting point with the two commands to detect a connedtd device.

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