OpenCV calls the camera video and saves it

 

Many online users say that the recorded video file is 0 kb or cannot be opened.

In fact, this is mainly due to two reasons:

1. The encoding format of the videos generated by OpenCV is related.

2. It is related to illegal withdrawal (I will solve it in 200 cycles. Or you can use Timer. Or use another key)

 

 

The solution I personally recommend is as follows:

1. Download an XviD encoder and install it.

2. Use the following code for testing:

1 # include "cv. h"
2 # include "cxcore. h"
3 # include "highgui. h"
4 # include <iostream>
5
6 using namespace std;
7 int main ()
8 {
9 CvCapture * capture = cvCaptureFromCAM (-1 );
10 CvVideoWriter * video = NULL;
11 IplImage * frame = NULL;
12 int n;
13 if (! Capture) // if the camera cannot be turned on, give a warning
14 {
15 cout <"Can not open the camera." <endl;
16 return-1;
17}
18 else
19 {
20 frame = cvQueryFrame (capture); // obtain a frame in the camera.
21 video = cvCreateVideoWriter ("camera. avi", CV_FOURCC ('x', 'V', 'I', 'D'), 25,
22 cvSize (frame-> width, frame-> height); // create a CvVideoWriter object and allocate space
23 // The saved file name is camera. avi, which must be selected during the program running. The video size is the video size of the camera and the frame frequency is 32.
24 if (video) // if you can create a CvVideoWriter object, it indicates that the object is successfully created.
25 {
26 cout <"VideoWriter has created." <endl;
27}
28
29 cvNamedWindow ("Camera Video", 1); // create a window
30 int I = 0;
31 while (I <= 200) // Let it automatically stop admission 200 times
32 {
33 frame = cvQueryFrame (capture); // obtain a frame from CvCapture
34 if (! Frame)
35 {
36 cout <"Can not get frame from the capture." <endl;
37 break;
38}
39 n = cvWriteFrame (video, frame); // determines whether the write is successful. If 1 is returned, the write is successful.
40 cout <n <endl;
41 cvShowImage ("Camera Video", frame); // displays the image of the Video content
42 I ++;
43 if (cvWaitKey (2)> 0)
44 break; // exit if there are other keyboard responses
45}
46
47 cvReleaseVideoWriter (& video );
48 cvReleaseCapture (& capture );
49 cvDestroyWindow ("Camera Video ");
50}
51 return 0;
52}