#include <opencv2/core/core.hpp>#include <opencv2/videoio/videoio.hpp>#include <opencv2/highgui/highgui.hpp>#include <iostream>using namespace cv;using namespace std;static void help(char** argv){    cout << "\nThis sample shows you how to read a sequence of images using the VideoCapture interface.\n"         << "Usage: " << argv[0] << " <image_mask> (example mask: example_%02d.jpg)\n"         << "Image mask defines the name variation for the input images that have to be read as a sequence. \n"         << "Using the mask example_%02d.jpg will read in images labeled as ‘example_00.jpg‘, ‘example_01.jpg‘, etc."         << endl;}int main(int argc, char** argv){    cv::CommandLineParser parser(argc, argv, "{help h||}{@image| ../data/768x576.avi |}");    if (parser.has("help"))    {        help(argv);        return 0;    }    string first_file = parser.get<string>("@image");    cout << "first_file = " << first_file << endl;    if(first_file.empty())    {        help(argv);        return 1;    }    // Jeff --> read video stream.    VideoCapture sequence(first_file);    if (!sequence.isOpened())    {        cerr << "Failed to open the image sequence!\n" << endl;        return 1;    }    Mat image;    namedWindow("Image sequence | press ESC to close", 1);    for(;;)    {        // Read in image from sequence        sequence >> image;        // If no image was retrieved -> end of sequence        if(image.empty())        {            cout << "End of Sequence" << endl;            break;        }        // Jeff --> we may control the speed here.        imshow("Image sequence | press ESC to close", image);        if(waitKey(500) == 27)            break;    }    return 0;}