如何在每次拍摄视频并将其写入文件时提供不同的文件名

我是opencv的新手。我正在做这个项目的一部分。

在下面的代码中，我已经使用VideoWriter类来存储名为MyVideo.avi的视频，正如我在下面代码中指定的那样。但每次我拍摄视频时，它都会以相同的名称存储，即被覆盖。所以我想用电脑日期和时间来命名它。请帮我修改这个

#include "opencv2/highgui/highgui.hpp"
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char* argv[])
{
VideoCapture cap(0); // open the video camera no. 0
if (!cap.isOpened())  // if not success, exit program
{
    cout << "ERROR: Cannot open the video file" << endl;
    return -1;
}
namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
 double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video
cout << "Frame Size = " << dWidth << "x" << dHeight << endl;
Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
 VideoWriter oVideoWriter ("D:/MyVideo.avi", CV_FOURCC('P','I','M','1'), 20, frameSize, true); //initialize the VideoWriter object 
 if ( !oVideoWriter.isOpened() ) //if not initialize the VideoWriter successfully, exit the program
{
    cout << "ERROR: Failed to write the video" << endl;
    return -1;
}
while (1)
{
    Mat frame;
    bool bSuccess = cap.read(frame); // read a new frame from video
    if (!bSuccess) //if not success, break loop
   {
         cout << "ERROR: Cannot read a frame from video file" << endl;
         break;
    }
     oVideoWriter.write(frame); //writer the frame into the file
    imshow("MyVideo", frame); //show the frame in "MyVideo" window
    if (waitKey(10) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
   {
        cout << "esc key is pressed by user" << endl;
        break; 
   }
}
return 0;
}