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How to get the position of the current frame in OpenCV using C++?
The current frame means that you are playing a video and the frame shown now is the current frame. It is also referred to as the active frame. In many application, you can require to get the number of the current frame.
The following program reads the position of the current frame and shows it in the console window.
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 current_Frame;//Declaring an integer variable to store the position of the current frame//
current_Frame = cap.get(CAP_PROP_POS_FRAMES);//Reading the position of current frame//
if (myImage.empty()){ //Breaking the loop if no video frame is detected//
break;
}
cout << "Current Frame Number:" << current_Frame << endl;
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 show the current frame's position in the console window.
Output
Updated on: 10-Mar-2021
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