学OpenCV

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简单的看下效果。

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文件后缀和编码要对应。

帧率设置的很小，相当于慢放效果，但视频时间会被拉长。

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 1 #include <iostream>
 2 
 3 #include <opencv2/opencv.hpp>
 4 #include <opencv2/core/utils/logger.hpp>
 5 
 6 
 7 void Test1()
 8 {
 9     cv::Mat frame;
10     cv::VideoCapture camera(0,cv::CAP_DSHOW);
11     if (camera.isOpened() == false)
12     {
13         std::cout << "open camera failed." << std::endl;
14         return;
15     }
16 
17     camera >> frame;
18     if (frame.empty())
19     {
20         std::cout << "no video on camera" << std::endl;
21         return;
22     }
23 
24     bool bColor = frame.type() == CV_8UC3;
25     
26     cv::VideoWriter writer(R"(C:\ProjectHome\test\LeanOpenCV\Test_SaveVideo\test1.avi)",
27                             cv::VideoWriter::fourcc('M', 'J', 'P', 'G'),
28                             60,
29                             frame.size(),
30                             bColor);
31     if (writer.isOpened() == false)
32     {
33         std::cout << "bad video writer" << std::endl;
34         return;
35     }
36 
37     for (;;)
38     {
39         if (camera.read(frame) == false)
40         {
41             std::cout << "end of camera input" << std::endl;
42             break;
43         }
44 
45         //writer << frame;
46         writer.write(frame);
47         
48         cv::imshow("camera realtime", frame);
49 
50         char c=cv::waitKey(1);
51         if (c == 27)
52         {
53             break;
54         }
55     }
56 
57     camera.release();
58     writer.release();
59 }
60 
61 int main()
62 {
63     cv::utils::logging::setLogLevel(cv::utils::logging::LOG_LEVEL_ERROR);
64     
65     Test1();
66 
67     cv::waitKey(0);
68 
69     return 0;
70 }