Qt使用opencv，进行视频录制，功能打开、关闭摄像头，开始、结束录制视频，暂停、继续录制，并保存视频文件

1.效果图

2 代码实现

2.1 .h文件

#ifndef VIDEORECORDWIDGET_H
#define VIDEORECORDWIDGET_H
#include 
#include
#include 
#include 
#include 
#include 
using namespace cv;
namespace Ui {
class VideoRecordWidget;
}
class VideoRecordWidget : public QWidget
{
    Q_OBJECT
public:
    explicit VideoRecordWidget(QWidget *parent = nullptr);
    ~VideoRecordWidget();
private slots:
    void on_pushButton_clicked();
    void on_pushButton_2_clicked();
    void on_pushButton_3_clicked();
    void on_pushButton_5_clicked();
    void on_pushButton_4_clicked();
    void updateFrame();
    void on_pushButton_6_clicked();
private:
    Ui::VideoRecordWidget *ui;
    VideoCapture capture;
    // QTimer timer;
    VideoWriter videoWriter;
    bool m_video_open;
    bool m_video_record;
    QTimer timer_open;
    QTimer timer_record;
    String recordViedo_fileName;
};
#endif // VIDEORECORDWIDGET_H

2.2 .cpp文件

#include "videorecordwidget.h"
#include "ui_videorecordwidget.h"
VideoRecordWidget::VideoRecordWidget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::VideoRecordWidget)
{
    ui->setupUi(this);
    m_video_open=false;
    m_video_record=false;
    // connect(&timer, &QTimer::timeout, this, &VideoRecordWidget::updateFrame);
}
VideoRecordWidget::~VideoRecordWidget()
{
    delete ui;
}
//开启摄像头
void VideoRecordWidget::on_pushButton_clicked()
{
    // 打开摄像头
    capture.open(0);
    if (!capture.isOpened()) {
        qDebug("Failed to open camera.");
        return;
    }
    qDebug()setText("视频录制器");
    timer_open.stop();
    m_video_open=false;
    if(m_video_record){
        qDebug()