#include <iostream>

#include <string>

#include <sstream>

#include <opencv2/highgui/highgui.hpp>

#include <time.h>

#include <omp.h>

#include <vector>

#include <omp.h>

#include <stdlib.h>

int main(int argc, char * argv[])

{

        const int w = 1920;

        const int h = 1200;

        const int size = 6;

        std::vector<cv::VideoWriter *> writer;

        for (int i = 0; i < size; i++)

        {

                std::ostringstream s;

                s << "file_" << i << ".avi";

                writer.push_back(new cv::VideoWriter(s.str(), CV_FOURCC('X','V','I','D'), 25.0f, cv::Size(w, h)));

        }

        clock_t s,f;

        int t = 4;

        if (argc > 1) t = atoi(argv[1]);

        omp_set_num_threads(t);

        s = clock();

        int i;

        for (int j = 0; j < 128; j++)

        {

                printf(".");

                cv::Mat frame(h, w, CV_8UC3, cv::Scalar(0));

                cv::circle(frame, cv::Point(w / 2, h / 2), h / 2 - j, cv::Scalar(255, 255, 255));

                #pragma omp parallel for private(i)

                for (i = 0; i < size; i++)

                {

                        *(writer[i]) << frame;                        

                }

        }

        f = clock();

        for (int i = 0; i < size; i++)

                writer[i]->~VideoWriter();

        std::cout << "Time : " << double( f - s) / CLOCKS_PER_SEC << "\n";

        return 0;

}