Computer Vision with OpenCV 3 and Qt5

Reading and writing videos in OpenCV

OpenCV provides a single and extremely easy-to-use class called VideoCapture for reading videos (or image sequences) from files saved on disk, or from capture devices, cameras, or a network video stream (for instance an RTSP address on the internet). You can simply use the open function to try opening a video from any of the mentioned source types and then use the read function to grab incoming video frames into images. Here's an example:

    VideoCapture video; 
    video.open("c:/dev/test.avi"); 
    if(video.isOpened()) 
    { 
      Mat frame; 
      while(true) 
      {             
        if(video.read(frame)) 
        { 
            // Process the frame ... 
        } 
        else 
        { 
            break; 
        } 
      } 
    } 
    video.release(); 

If you want to load an image sequence, you simply need to replace the filename ...