Jetson Nano with 4 usb ports and 4 connected cameras, it only starts image on two cameras

Hello! I have a jetson nano with 4 connected cameras by usb. When I execute my Phyton it only shows to me the image from 2 cameras at the same time. My code finds all the cameras but only shows 2.

The image comes from two cameras that do not have to be the same. I have already tryed with all of them and I can see image from the four cameras.

So I would like to see the image from all of them at the same time.

What Python code? Suppose it could be the python code to one only two video if you confirm the system have 4 cameras.

ls /dev/video*
v4l2-ctl --list-devices

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