How to extract Frames from AVI video - c++

Question

Hey peeps so far i manage OpenCV to play a video.avi but what should i do now to extract frames...?
below is the code i written so far that got my video playing:
#include<opencv\cv.h>
#include<opencv\highgui.h>
#include<opencv\ml.h>
#include<opencv\cxcore.h>
int main( int argc, char** argv ) {
cvNamedWindow( "DisplayVideo", CV_WINDOW_AUTOSIZE );
CvCapture* capture = cvCreateFileCapture( argv[1] );
IplImage* frame;
while(1) {
frame = cvQueryFrame( capture );
if( !frame ) break;
cvShowImage( "DisplayVideo", frame );
char c = cvWaitKey(33);
if( c == 27 ) break;
}
cvReleaseCapture( &capture );
cvDestroyWindow("DisplayVideo" );
}

Answer 1

frame is the frame you are extracting. If you want to convert that to a cv::Mat you can do that by creating a mat with that IplImage:
Mat myImage(IplImage);
There is a nice tutorial on it here.
However, you are doing it the old way. The newest version of OpenCV has the latest camera capture abilities, and you should do something like this:
#include "cv.h"
#include "highgui.h"
using namespace cv;
int main()
{
VideoCapture cap(0); // open the default camera
if(!cap.isOpened()) // check if we succeeded
return -1;
namedWindow("Output",1);
while(true)
{
Mat frame;
cap >> frame; // get a new frame from camera
//Do your processing here
...
//Show the image
imshow("Output", frame);
if(waitKey(30) >= 0) break;
}
// the camera will be deinitialized automatically in VideoCapture destructor
return 0;
}