OpenCV学习（二、写视频）

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;}