Opencv读取并获取视频属性

opencv中通过VideoCaptrue类对视频进行读取操作以及调用摄像头.常用的操作如下:

1、常用构造函数

1.VideoCapture类的构造函数：
C++: VideoCapture::VideoCapture()
C++: VideoCapture::VideoCapture(const string& filename)
C++: VideoCapture::VideoCapture(int device)

2、判断是否打开

cap.isOpened()

3、获取视频相关属性

cout << "视频相关信息如下" << endl;
cout << "宽度：" << cap.get(CV_CAP_PROP_FRAME_WIDTH) << endl;
cout << "高度：" << cap.get(CV_CAP_PROP_FRAME_HEIGHT) << endl;

cout << "总帧数：" << cap.get(CV_CAP_PROP_FRAME_COUNT) << endl;
cout << "帧率（fps）：" << cap.get(CV_CAP_PROP_FPS) << endl;

4、逐帧读取

Mat frame;

cap >> frame;

5、判断是否完毕

frame.empty()

6、显示视频

imshow("readvideo", frame);

1 1 include <opencv2\opencv.hpp>
2 2 #include <iostream>
3 3 using namespace std;
4 4 using namespace cv;
5 5 int main()
6 6 {
7 7     cout <<CV_VERSION << endl;
8 8     VideoCapture cap("c://dev//res//out.avi");
9 9     if (!cap.isOpened())
1010     {
1111         cout << "视频文件打开失败" << endl;
1212     }
1313     cout << "视频相关信息如下" << endl;
1414     cout << "宽度：" << cap.get(CV_CAP_PROP_FRAME_WIDTH) << endl;
1515     cout << "高度：" << cap.get(CV_CAP_PROP_FRAME_HEIGHT) << endl;
1616     cout << "总帧数：" << cap.get(CV_CAP_PROP_FRAME_COUNT) << endl;
1717     cout << "帧率（fps）：" << cap.get(CV_CAP_PROP_FPS) << endl;
1818 
1919     Mat frame;
2020     while (1)
2121     {
2222         cap >> frame;
2323         if (frame.empty())
2424         {
2525             break;
2626         }
2727         imshow("readvideo", frame);
2828         waitKey(20);//win10 vs2015返回值-1
2929     }
3030     getchar();
3131     return 0;