OpenCV - read video file and write to file

1. The code is as follows:

#include<opencv2/opencv.hpp>     

using namespace cv;

//-----------------------------------[main() function]------- -------------------------------------    
// Description: The entry function of the console application, our program starts here    
//-------------------------------------------------------------------------------------------------    
void main()
{
//[1] Read video from video file    
	VideoCapture capture("Blessing film.avi");//Read the video file
	if (!capture.isOpened())//If the video file is not opened, return.  
		return;
	Size size0 = Size(capture.get(CV_CAP_PROP_FRAME_WIDTH), capture.get(CV_CAP_PROP_FRAME_HEIGHT));
	VideoWriter writer("out.avi", CV_FOURCC('X', 'V', 'I', 'D'), capture.get(CV_CAP_PROP_FPS), size0, true);
//[2] Loop to display each frame    
	while (1)
	{
		Mat frame; //Define a Mat variable to store the image of each frame    
		capture >> frame; //Read the current frame
		writer << frame;//Equivalent to writer.write(frame); to write the frame.
		if (frame.empty())
		{
			break;
		}
		imshow("Video", frame); //Display the current frame  
		waitKey(30); //delay 30ms    
	}
	capture.release();//Release resources  
	destroyAllWindows();//Close all windows  
}

2. The effect is as follows:

3. A video file named "out.avi" is written in the program running directory.

4. Notes: 

1) Before writing the video, you need to install the corresponding codec (eg: XVID)

2) Whether the generated video supports color should be consistent with the constructor setting 

3) The size of the generated video must be the same as the size of the read video