#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QMainWindow>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <QTimer>
#include <QDebug>
namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();private:Ui::MainWindow *ui;cv::VideoCapture video;cv::Mat src_frame;QTimer *timer;QImage qimg;
private slots:void getframe();void on_pushButton_clicked();};#endif // MAINWINDOW_H

#include "mainwindow.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "iostream"
using namespace cv;
using namespace std;
MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);video=cv::VideoCapture("C:\\Users\\Administrator\\Desktop\\code\\video\\video\\video\\1.avi");
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_pushButton_clicked()
{timer = new QTimer(this);connect(timer,SIGNAL(timeout()),this,SLOT(getframe()));timer->start(42);//按照每秒24帧计算，每过42ms执行一次getframe
}
int k=0;
void MainWindow::getframe()
{k++;cout<<k<<"get frame"<<endl;video>>src_frame; //从视频取帧if(!src_frame.data)timer->stop();//如果取不到数据，终止计时器qimg = QImage((const uchar*)src_frame.data,src_frame.cols,src_frame.rows, QImage::Format_RGB888); //简单地转换一下为Image对象，rgbSwapped是为了显示效果色彩好一些。//ui->label->clear();ui->label->setPixmap(QPixmap::fromImage(qimg));
}