QT OpenCV Video is not playing

[aniljoby]

I am on the way to develop a hand gesture controlled robot. But for processing i can't open any video files. The code used for the video is
@
#include <QCoreApplication>
#include <opencv/highgui.h>
#include <opencv2/imgproc/imgproc.hpp>
#include <stdio.h>
#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv/cv.h>
#include <opencv2/video/video.hpp>

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

 Mat src_gray,src;

namedWindow( "Source",0 );

VideoCapture cap( "hand.MP4");

if(!cap.isOpened()){
    cout<<"not open";
    return a.exec&#40;&#41;;
}

while(1) {

cap.read(src);
.....................

//processing codes here..
....................
imshow( "Source", src );

if(waitKey(30==27))
        break;

}

return a.exec();

}

}

@

But every time output is "not open";
Can you please suggest whats gone wrong in my code.
I am using windows 8.1, opencv 2.4.9, QT 5.2.1.
Thanks.

[SGaist]

Hi,

"hand.MP4" is a relative path, so my guess is that the file is not found. Where is hand.MP4 located ?

[aniljoby]

The file is stored in its build directory.
Also i tried giving the complete path, but no use.

[SGaist]

Then you might be having a codec problem. Search for "opencv mp4", you'll get some useful hints to go further