c++ - libv4l2 error : No space left on device -

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i have 2 different cameras. used below simple code , error. there similar question on site there isn't accepted answer. error message :

libv4l2: error turning on stream: no space left on device vidioc_streamon: no space left on device opencv error: assertion failed (size.width>0 && size.height>0) in imshow, file  /home/opencv/opencv-2.4.10/modules/highgui/src/window.cpp, line 269

code : 

videocapture cap(2);  videocapture cap2(1);   if(!cap.isopened())  // check if succeeded {     cout << "webcam cannot open!\n" ;     return -1; } if(!cap2.isopened())  // check if succeeded {     cout << "webcam2 cannot open!\n" ;     return -1; } namedwindow( "window1", cv_window_autosize ); namedwindow( "window2", cv_window_autosize ); for(;;) {     ikey = waitkey(5);     if (ikey == esc) {  break;  }     cap >> frame;     cap2 >> frame2;      imshow("window1", frame);     imshow("window2", frame2); }

edit 1 these camera use same hub according search on web.i did test , output below. don't understand should solve problem.

sudo cat /sys/kernel/debug/usb/devices | grep "b: "  b:  alloc=  0/900 ( 0%), #int=  0, #iso=  0 b:  alloc= 37/900 ( 4%), #int=  2, #iso=  0 b:  alloc=  0/900 ( 0%), #int=  0, #iso=  0 b:  alloc=  0/900 ( 0%), #int=  0, #iso=  0  b:  alloc=  0/900 ( 0%), #int=  0, #iso=  0 b:  alloc=  0/900 ( 0%), #int=  0, #iso=  0 b:  alloc=  0/800 ( 0%), #int=  0, #iso=  0 b:  alloc=  0/800 ( 0%), #int=  0, #iso=  0

i got same problem 2 depth sense cameras (usb) on 2 usb ports next each other. used same usb bus inside , much, switched 1 usb 3.0 port (which bus) , works.


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