VideoCapture will fail after open it many (about 99xx) times

[stonechao]

System information

• OpenCV => 2.4.13.6
• Operating System / Platform => windows7 64bit, windows10
• Compiler => VS2015
• WebCam => USB webcam

Detailed description

I found that open videocapture will fail when I did it many times.
It always failed around the 99xx times.

The testing code is quite simple as the following.
I show image when loop > 9900 since it will be easier to tell if the webcam still alive.

Is it an known issue or I did something wrong?
Thanks for comments.

Steps to reproduce

int main()
{
   Mat image;
   VideoCapture cap;      

   int i = 0;
   for (i = 0; i < 11000; i++)
   {			
   	cap.open(0);          
   	if (cap.isOpened())  
   	{
   		printf("open ok at:%d\n", i);

   		if (i > 9900) //read and show image after loop 9900
   		{
   			cap >> image;        
   			imshow("Webcam live", image);
   			waitKey(100);												
   		}
   	}
   	else
   	{
   		printf("open fail at:%d\n", i);
   	}

   }

   return 0;

}

[mshabunin]

OpenCV 2.4.x is very old and will not be fixed anyway. Could you please try and reproduce your issue with OpenCV 4.5.5 (or 4.x branch)? Also post more information about your OpenCV build configuration.

Hint: set environment variables OPENCV_VIDEOIO_DEBUG=1 and OPENCV_LOG_LEVEL=debug to capture more information around the moment of failure.