Only 2 of 4 usb cameras available

4 usb cameras plugged in XAVIER via USB ports, but only 2 of them available (image caputured).
Firstly we suspected the USB bandwith, so we reduced the image resolution from 1920x1080 to 640x480, but the situation didn’t change.

If you use USB2 cameras it may hit constraint in bandwidth. Please refer to this post:
connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit) - #12 by DaneLLL

Yes, the cameras are USB2.0, while XAVIER NX Dev. kits are USB3.1, the USB2.0 bandwidth limit the number of available cameras, right?

Yes. The bandwidth for USB2 is 480Mbps.

if image captured and saved as MJPEG format with 1:10 compression rate, 30fps, then 1920x1080 code rate will be around 40Mbps, would it help to tolerate more USB2 cameras?

In default UVC driver it should request for maximum bandwidth, so it requests for YUV422. Your proposal probably works by customizing the driver code, but may also trigger unexpected stability issues. It would be better to switch to USB3 cameras.

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