Per camera two 'video' items added to /sys/class/video4linux directory

When I connect one camera the items video0 en video1 are added to the directory
When adding a second camera, items video2 and video3 are added.

Is this normal? Do I have a problem somewhere?
When opening these cameras in OpenCV, should I use open(0) for the first camera and open(2) for the second?

See Why it showed two devices under /dev for one camera

Ah, thx. I thought it was a bug. But now I understand what is going on.

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