openCV video i/o example

opencv_video_io.cpp

#include <opencv2/opencv.hpp>
#include <opencv2/video.hpp>

#pragma comment(lib, "opencv_core320.lib")
#pragma comment(lib, "opencv_videoio320.lib")


int main(int argc, const char* argv[])
{
    if (argc != 3) {
        return 1;
    }
    cv::VideoCapture videoReader(argv[1]);
    if (!videoReader.isOpened()) {
        printf("open failed - %s\n", argv[1]);
        return 1;
    }
    double fps = videoReader.get(cv::CAP_PROP_FPS);
    cv::Size size((int)videoReader.get(cv::CAP_PROP_FRAME_WIDTH), (int)videoReader.get(cv::CAP_PROP_FRAME_HEIGHT));
    int fourcc = (int)videoReader.get(cv::CAP_PROP_FOURCC);

    cv::VideoWriter videoWriter(argv[2], fourcc, fps, size, true);
    if (!videoWriter.isOpened()) {
        printf("open failed - %s\n", argv[2]);
        return 1;
    }

    cv::Mat src;
    while (videoReader.grab()) {
        if (!videoReader.retrieve(src)) break;
        videoWriter << src;
    }
    videoWriter.release();
    videoReader.release();

    return 0;
}