在QT中读取视频，进行格式转换。IplImage->Mat->QImage->QPixmap

时间：2020-12-20 23:11:37

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       QPixmap* pixmap;
      
      
      

      
      
      

       
       
       IplImage *imageVideo;
      
      
      

      
      
      

       
       
       Mat image;
      
      
      

      
      
      

       
       
       QImage img;
      
      
      

      
      
      

       
       
       CvCapture* capture = cvCaptureFromeFIle("E:/home.MP4");
      
      
      

      
      
      

       
       
       FrameRate = (int)cvGetCaptureProprety(capture,CV_CAP_PROP_FPS);//帧率
      
      
      

      
      
      

       
       
       TotalFrame = (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_COUNT);//帧数
      
      
      

      
      
      

       
       
       QString num = QString::num(totalFrame);//显示出帧数 
      
      
      

      
      
      

       
       
       ui->lineEdit->setTex(num);
      
      
      

      
      
      

       
       
       int imgH = (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT);
      
      
      

      
      
      

       
       
       int imgW = (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH);
      
      
      

      
      
      

       
       
       pixmap = new QPixmap(imgW,imgH);
      
      
      

      
      
      

       
       
       cvSetCaptureProperty(capture,CV_CAP_PROP_POS_FRAMES,100);//第100帧开始读取
      
      
      

      
      
      

       
       
       imageVideo = cvQueryFrame(capture);
      
      
      

      
      
      

       
       
       image = Mat(imageVideo);
      
      
      

      
      
      

       
       
       cvtColor(image,image,CV_BGR2RGB);
      
      
      

      
      
      

       
       
       img = QImage((const unsigned char*)image.data,image.cols,image.rows,
      
      
      

      
      
      

       
       
                                          QImage::Format_RGB88);
      
      
      

      
      
      

       
       
       *pixmap = QPixmap::fromImage(img);
      
      
      

      
      
      

       
       
       



      
      
      

       
       
       ui->label->setPixmap(*pixmap);

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