opencv保存视频

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;
}