OpenCV学习（二、写视频）

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opencv2.0之后可以调用VideoWriter类来写视频

opencv采集视频并保存AVI视频到本地

#include <opencv2/opencv.hpp>
using namespace cv;
int main()
{
    VideoCapture cap(0);
    //获取采集视频图像的宽和高
    Mat frame;
    cap >> frame;
    int height = frame.rows;
    int width = frame.cols;


    //规定视频文件名，编码方式，每秒帧数，视频大小
    VideoWriter writeAVI = VideoWriter("1.avi",CV_FOURCC('D','I','V','X'),25,Size(width,height));

    while(cap.isOpened())
    {
        cap >> frame;
        namedWindow("摄像头采集");
        imshow("摄像头采集",frame);

        writeAVI << frame;
        if(waitKey(20) >= 0)//延迟40ms，如果有按键则退出循环
            break;
    }

    return 0;
}