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功能实现：

1.弹窗，手动选择打开视频文件；

头文件包含：

#include 
   
    #include 
    
     #include 
     
      #include 
      
     
    
   

UI显示

打开视频文件后：

代码实现：

打开视频文件

// 打开视频文件void tVideoCapture::on_btnOpen_clicked(){
   	QString deftPath = "E:/OfficeVideos_hiv2018",		deftSuffic = "Videos(*.avi *.mp4 *.wmv);;Films(*.mkv *.rmvb *.mpeg);;Alls(*.*)";	QString VideoName = QFileDialog::getOpenFileName(nullptr, "Open-Video", deftPath, deftSuffic);	if (VideoName.isEmpty())  return;	mLabel1->setText(VideoName);	vc = new VideoCapture;	String cStr(VideoName.toStdString());	vc->open(cStr);	QString str;	if (vc->isOpened())	{
   		str = QString::fromLocal8Bit("视频读取成功！");	}	else	{
   		str = QString::fromLocal8Bit("视频读取失败！");		qDebug() << str;		return;	}	qDebug() << str;	double Ratio = vc->get(CV_CAP_PROP_FPS),//帧率		wid = vc->get(CV_CAP_PROP_FRAME_WIDTH),//每帧图像宽度		heit = vc->get(CV_CAP_PROP_FRAME_HEIGHT);//每帧图像高度	int cnt = 0;	cnt = vc->get(cv::CAP_PROP_FRAME_COUNT);//帧数		qDebug() << "Ratio: " << Ratio << "Width: " << wid << "Height: " << heit << "count: " << cnt;	Mat fm;	if (vc->read(fm))	{
   		mInter->sendVideoName(fm);	}}

播放

// 播放void tVideoCapture::on_btnRun_clicked(){
   	if (ui.btnRun->text() == QString::fromLocal8Bit("播放"))	{
   		ui.btnRun->setText(QString::fromLocal8Bit("暂停"));				mLabel2->setText(QString::fromLocal8Bit("正常播放！"));				mTimer->start();	}	else	{
   		ui.btnRun->setText(QString::fromLocal8Bit("播放"));		mTimer->stop();		mRunFast = false;		mLabel2->setText(QString::fromLocal8Bit("暂停播放！"));	}}

快进

// 快进void tVideoCapture::on_btnFast_clicked(){
   	if (ui.btnFast->text() == QString::fromLocal8Bit("快进"))	{
   		ui.btnFast->setText(QString::fromLocal8Bit("停止快进"));		mRunFast = true;		mLabel2->setText(QString::fromLocal8Bit("快进播放！"));	}	else	{
   		ui.btnFast->setText(QString::fromLocal8Bit("快进"));		mRunFast = false;		mLabel2->setText(QString::fromLocal8Bit("正常播放！"));	}	}

截图

// 截图void tVideoCapture::on_btnGrab_clicked(){
   	mTimer->stop();	mRunFast = false;	mLabel2->setText(QString::fromLocal8Bit("暂停播放！"));	ui.btnRun->setText(QString::fromLocal8Bit("播放"));	QString deftPath = "",		deftSuffic = "Imgs(*.jpg *.bmp *.png *.tiff);;Alls(*.*)";	QString SavePth = QFileDialog::getSaveFileName(nullptr, "Save-Images", deftPath, deftSuffic);	if (SavePth.isEmpty()) return;	Mat fm;	if (vc->read(fm))	{
   		imwrite(SavePth.toStdString(), fm);	}}

代码截图

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