📜  播放视频的 OpenCV C++ 程序

📅  最后修改于: 2021-10-20 12:14:01             🧑  作者: Mango

下面是对使用OpenCV工具用C++播放视频的C++代码的解释。
须知:
(1) 代码只能在Linux环境下编译。
(2) 在windows下运行,请使用文件:’play_video.o’并在cmd中运行。但是,如果它不运行(系统架构中的问题),则编译它
通过对代码进行适当且明显的更改,例如:使用
代替
(3)编译命令:g++ -w vid.cpp -o vid `pkg-config –libs opencv`
(4) 运行命令:./vid
(5) 请确保视频:“Bumpy.mp4”在同一位置。
在运行代码之前,请确保您的系统上安装了 OpenCV。
代码片段:

#include "opencv2/highgui/highgui.hpp"
// highgui - an interface to video and image capturing.

#include 
// The header files for performing input and output.

using namespace cv;
// Namespace where all the C++ OpenCV functionality resides.

using namespace std;
// For input output operations.


int main()
{
    VideoCapture cap("Bumpy.mp4");
    // cap is the object of class video capture that tries to capture Bumpy.mp4
    if ( !cap.isOpened() )  // isOpened() returns true if capturing has been initialized.
    {
        cout << "Cannot open the video file. \n";
        return -1;
    }

    double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video
    // The function get is used to derive a property from the element.
    // Example:
    // CV_CAP_PROP_POS_MSEC :  Current Video capture timestamp.
    // CV_CAP_PROP_POS_FRAMES : Index of the next frame.

    namedWindow("A_good_name",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
    // first argument: name of the window.
    // second argument: flag- types: 
    // WINDOW_NORMAL : The user can resize the window.
    // WINDOW_AUTOSIZE : The window size is automatically adjusted to fitvthe displayed image() ), and you cannot change the window size manually.
    // WINDOW_OPENGL : The window will be created with OpenGL support.

    while(1)
    {
        Mat frame;
        // Mat object is a basic image container. frame is an object of Mat.

        if (!cap.read(frame)) // if not success, break loop
        // read() decodes and captures the next frame.
        {
            cout<<"\n Cannot read the video file. \n";
            break;
        }

        imshow("A_good_name", frame);
        // first argument: name of the window.
        // second argument: image to be shown(Mat object).

        if(waitKey(30) == 27) // Wait for 'esc' key press to exit
        { 
            break; 
        }
    }

    return 0;
}
// END OF PROGRAM

关于作者:

Aditya Prakash 是印度学院的本科生阿迪亚信息技术,瓦多达拉。他主要用 C++ 编写代码。他的座右铭是:到目前为止一切顺利。他打板球,看超级英雄电影,踢足球,是回答问题的忠实粉丝。

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