#include <opencv2/highgui/highgui.hpp>
#include <time.h>
#include <iostream>

int main()
{
	cv::VideoCapture cap("d:/test.avi");
	cv::Mat frame;
	for (;;)
	{
		clock_t start = clock();
		cap >> frame;
		double time = clock() - start;
		if (time > 500)
			std::cout << "Took to long: " << time << " milliseconds!\n";
		if (frame.empty())
			break;

		/*
		// or use the following instead:
		clock_t start = clock();
		bool last = !cap.read(frame);
		double time = clock() - start;
		if (time > 500)
			std::cout << " Took to long: " << time << " milliseconds!\n";
		if (last)
			break;
		*/
	}
}