How to calculate Elapsed time in OpenCV using C++?

Here, we will understand how to calculate the elapsed time using OpenCV.

The following program calculates the elapsed time in OpenCV using C++.

Example

#include<opencv2/opencv.hpp>//OpenCV header to use VideoCapture class// #include<iostream> using namespace std; using namespace cv; int main() {    Mat myImage;//Declaring a matrix to load the frames//    namedWindow("Video Player");//Declaring the video to show the video//    VideoCapture cap("video.mp4");//Declaring an object to load video from device//    if (!cap.isOpened()){ //This section prompt an error message if no video stream is found//       cout << "No video stream detected" << endl;       system("pause");       return-1;    }    while (true){ //Taking an everlasting loop to show the video//       cap >> myImage;       int elapsed_time;//Declaring an integer variable to store the elapsed time//       elapsed_time=cap.get(CAP_PROP_POS_MSEC);//Reading the elapsed time//       cout << "Ellapsed time(in second):" << elapsed_time / 1000 << endl;//Showing the elapsed time in seconds//       if (myImage.empty()){ //Breaking the loop if no video frame is detected//          break;       }       imshow("Video Player", myImage);//Showing the video//       char c = (char)waitKey(25);//Allowing 25 milliseconds frame processing time and initiating break condition//       if (c == 27){ //If 'Esc' is entered break the loop//          break;       }    }    cap.release();//Releasing the buffer memory//    return 0; }

This program will play the video and will show elapsed time in the console window.

Output