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);

 include <opencv2\opencv.hpp>
 #include <iostream>
 using namespace std;
 using namespace cv;
 int main()
 {
     cout <<CV_VERSION << endl;
     VideoCapture cap("c://dev//res//out.avi");
     if (!cap.isOpened())
     {
         cout << "视频文件打开失败" << endl;
     }
     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;

     Mat frame;
     while ()
     {
         cap >> frame;
         if (frame.empty())
         {
             break;
         }
         imshow("readvideo", frame);
         waitKey();//win10 vs2015返回值-1
     }
     getchar();
     return ;