利用opencv提供的方法，从摄像头获取视频，并保存为.avi格式文件。

win8.1，opencv248，vs2013下测试

#include<opencv\cv.h>

#include<highgui.h>

#include<iostream>

using namespace cv;

using namespace std;

int main()

{

	CvCapture    * capture = cvCaptureFromCAM(0);

	IplImage     * frame = NULL;

	CvVideoWriter* video = NULL;

	int i = 0;

	// 视频存储 相应参数 设置

	int fps = 10; //帧率

	int codec = CV_FOURCC('D','I','V','X'); //视频编码 （MPEG-4）

	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

	{

		i = 1;

		frame = cvQueryFrame(capture); //首先取得摄像头中的一帧

		//创建CvVideoWriter对象并分配空间

		//保存的文件名为camera.avi，视频编码为MPEG-4，大小就是摄像头视频的大小，帧频率是fps=10

		video = cvCreateVideoWriter("camera.avi", codec, fps, cvSize(frame->width, frame->height), 1);

		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 (frame = cvQueryFrame(capture))//从CvCapture中获得一帧

			{

				if (!frame)

				{

					cout << "Can not get frame from the capture." << endl;

					break;

				}

				if (cvWriteFrame(video, frame))//判断是否写入成功，如果返回的是1，表示写入成功

				{

					if (i%fps == 0)

						cout << i / fps << "s" << endl;

					cout << 1 << " ";

				}

				++i;

				cvShowImage("Camera Video", frame); //显示视频内容的图片

				if (cvWaitKey(1000 / fps)>0) break; //有其他键盘响应，则退出

				if (i >= fps * 60) break;

			}

		}

		else{

			cout << "can not create VideoWriter." << endl;

		}

		cvReleaseVideoWriter(&video);

		cvReleaseCapture(&capture);

		cvDestroyWindow("Camera Video");

	}

	return 0;

}