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 (1)
    {
        cap >> frame;
        if (frame.empty())
        {
            break;
        }
        imshow("readvideo", frame);
        waitKey(20);//win10 vs2015返回值-1
    }
    getchar();
    return 0;