Getting frame from video

Question

#include "opencv2/opencv.hpp"
#pragma comment (lib , "opencv_core244d.lib")
#pragma comment (lib ,"opencv_highgui244d.lib")
#pragma comment(lib , "opencv_imgproc244d.lib")
int main(int argc, char* argv[])
{
    CvCapture* capture = cvCaptureFromFile("try.avi");

    IplImage* frame = NULL;
    do
    {
        frame = skipNFrames(capture, 1);
        cvNamedWindow("frame", CV_WINDOW_AUTOSIZE);
        cvShowImage("frame", frame);
        cvWaitKey(0);
    } while( frame != NULL );

    cvReleaseCapture(&capture);
    cvDestroyWindow("frame");
    cvReleaseImage(&frame);

    return 0;
}

This is my program to get frames from the video , but when i run this program , it works , it show me the video , but its not saving the frames automatically (without using any button or mouse) , which should save in my directory

Answer 1

To save each frame individually,

1. #include<stdio.h>

2. Declare a global variable

   int flag=0;

3. add following code just below to cvWaitKey(0) :

   char *str=new char[50];
   
   flag++;
   sprintf(str,"%d",flag);
   strcat(str," frame");
   strcat(str,".jpg");
   Mat image=frame;
   imwrite(str,image);