How to install codecs for opencv? - c++

Question

I am trying to write a program that captures video from a webcam using this code:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
Mat frame;
VideoCapture cap(1);
char key;
String outputName = "output.avi";
VideoWriter outputVideo;
Size size = Size(cap.get(CV_CAP_PROP_FRAME_WIDTH), cap.get(CV_CAP_PROP_FRAME_HEIGHT));
outputVideo.open(outputName, CV_FOURCC('D', 'I', 'V', 'X'), cap.get(CV_CAP_PROP_FPS), size, true);
if (!outputVideo.isOpened())
{
cout << "Could not open the output video for write: " << outputName << endl;
return -1;
}
cout << "size " << size.width << " x " << size.height << endl;
namedWindow("Display window", WINDOW_AUTOSIZE); // Create a window for display.
cap.set(CV_CAP_PROP_EXPOSURE, -8);
while (true){
bool success = cap.read(frame);
if (!success){
cout << "Cannot read frame from file" << endl;
return -2;
}
outputVideo.write(frame);
imshow("Display window", frame);
key = waitKey(1);
if (key == ' '){
cout << "Video ended due to key stroke" << endl;
return 1;
}
}
return 0;
}
The program doesn't seem to be able to open outputVideo since it always returns -1. I thought that I might not have the codec divx installed, but I have installed it from k-lite codec pack and divx and it still does not work.
Could anybody please tell me how to install codecs such that opencv recognizes them?
I am using OpenCV 2.4.10 on Windows 7 with Visual studio 2013.