我在win7 32位系统上 上用visual studio 2013 ,openCV 2.4.9上运行以下代码,装的有USB摄像头,生成代码成功,运行的时候显示写入成功,但是显示不出来视频,不知道是什么原因?求指教
#include <opencv.hpp>
#include<cv.h>
#include<cxcore.h>
#include<highgui.h>
#include<iostream>
using namespace std;
using namespace cv;
int main()
{
CvCapture* capture = cvCaptureFromCAM(-1);
CvVideoWriter* video = NULL;
IplImage* frame = NULL;
int n;
if (!capture) //如果不能打开摄像头给出警告
{
cout << "Can not open the camera." << endl;
return -1;
}
else
{
frame = cvQueryFrame(capture); //首先取得摄像头中的一帧
video = cvCreateVideoWriter("G:\\学位论文\\opencv\\camera.avi", -1, 32, cvSize(frame->width, frame->height)); //创建CvVideoWriter对象并分配空间
//保存的文件名为camera.avi,编码要在运行程序时选择,大小就是摄像头视频的大小,帧频率是32
if (video) //如果能创建CvVideoWriter对象则表明成功
{
cout << "VideoWriter has created." << endl;
}
cvNamedWindow("Camera Video", 1); //新建一个窗口
while (1)
{
frame = cvQueryFrame(capture); //从CvCapture中获得一帧
if (!frame)
{
cout << "Can not get frame from the capture." << endl;
break;
}
n = cvWriteFrame(video, frame); //判断是否写入成功,如果返回的是1,表示写入成功
cout << n << endl;
cvShowImage("Camera Video", frame); //显示视频内容的图片
if (cvWaitKey(2) > 0) break; //有其他键盘响应,则退出
}
cvReleaseVideoWriter(&video);
cvReleaseCapture(&capture);
cvDestroyWindow("Camera Video");
}
return 0;
}