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The last argument gives you a certain amount of control over the device
-device node number used (i.e. the X in ``videoX``). Normally you will pass -1
+node number used (i.e. the X in ``videoX``). Normally you will pass -1
to let the v4l2 framework pick the first free number. But sometimes users
want to select a specific node number. It is common that drivers allow
the user to select a specific device node number through a driver module