Video play issue from file using OpenCV library in QT

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Hi,

Am new to OpenCV, trying to play video from file from Qt but unsuccessful. Following is the code am trying int VideoTest::Videoplay() {

VideoCapture cap("/home/manu/Desktop/song.mp4"); if(!cap.isOpened()) // check if we succeeded return -1;

Mat edges; namedWindow("edges",1); for(;;) { Mat frame; cap >> frame; cvtColor(frame, edges, COLOR_BGR2GRAY); GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5); Canny(edges, edges, 0, 30, 3); imshow("edges", edges); if(waitKey(30) >= 0) break; } return 0;

}

Instead of file name if i give camera number am able to open camera and display it, But video file is not opening. Please help with the solution.