libv4l2 error : No space left on device
If you get low resolution frame, the problem will solve.Below code was enough for me.
VideoCapture cap1 = VideoCapture(1);
VideoCapture cap2 = VideoCapture(2);
cap1.set(CV_CAP_PROP_FRAME_WIDTH, 300);
cap1.set(CV_CAP_PROP_FRAME_HEIGHT, 300);
cap2.set(CV_CAP_PROP_FRAME_WIDTH, 300);
cap2.set(CV_CAP_PROP_FRAME_HEIGHT, 300);
OpenCV Multi-camera handling issue
Using PCI usb extension card solved the same problem for me since a webcam accupies all available bandwith on usb bus. Using pci usb extension card provides you with second usb bus which you can connect your second webcam
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