Problem with embedded transplantation of binocular vision, two cameras cannot be opened at the same time

Linux cross-compiler camera embedded development seed-dim3517

1. Use v4l to collect and display a single image on QT. At the same time, it can be transplanted to my embedded development board to achieve image acquisition and display.

2. Because the project needs to enable two cameras at the same time, the same program enables two cameras to run on the computer and can be opened at the same time.

The following error occurs when you can compile it on the Development Board:

Uvcvideo: failed to submit urb 0 (-28 ).

There is no solution after searching for a long time. It's stuck here.