connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit)

Hi,
With further investigation, we found bandwidth limitation is hit in using USB2(High-Speed) cameras. High-Speed limit is 480Mbps. In the test, two E-Con See3CAM_CU135 are USB3(Super-Speed) cameras.

Please use USB3 cameras to get 5Gbps bandwidth.

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