cvWriteFrame(writer,img);//cvReleaseVideoWriter(&writer)

#pragma comment(lib,"highgui.lib")#pragma comment(lib,"cxcore.lib")#pragma comment(lib,"cv.lib")#pragma comment(lib,"ml.lib")#pragma comment(lib,"cvaux.lib")#pragma comment(lib,"cvcam.lib") #include "cv.h"#include "highgui.h"#include <stdio.h>inline void cvDoubleMatPrint( const CvMat* mat );inline void cvDoubleMatSet(  CvMat* mat,double v );inline void cvDoubleMatSet( CvMat* mat);inline void cvScalarPrint(const CvScalar& s);int main( int argc, char** argv ){// if( argc == 2 && (pImg = cvLoadImage( argv[1], CV_LOAD_IMAGE_UNCHANGED)) != 0 )//  return 0;CvCapture* capture = cvCaptureFromCAM(0); // capture from video device #0//CvCapture* capture = cvCaptureFromAVI("infile.avi");IplImage* img = 0; //CVAPI(int) cvGrabFrame( CvCapture* capture );cvNamedWindow("image",CV_WINDOW_AUTOSIZE);CvVideoWriter *writer = 0;int isColor = 1;int fps     = 25;  // or 30int frameW  = 640; // 744 for firewire camerasint frameH  = 480; // 480 for firewire cameraswriter=cvCreateVideoWriter("out.avi",CV_FOURCC('X','V','I','D'),                           fps,cvSize(frameW,frameH),isColor);char key=0;while(key!=27){  cvGrabFrame(capture);          // capture a frame  img=cvRetrieveFrame(capture);  // retrieve the captured frame  // img = cvQueryFrame(capture);  cvShowImage("image", img);  cvWriteFrame(writer,img);      // add the frame to the filekey=cvWaitKey(30);           // wait 20 ms//注意 cvWaitKey 参数应该不小于 20 ms，否则画面的显示可能出错.} //由视频流捕捉器得到的图像是由捕捉器分配和释放内存的，不需要单独对图像进行释放内存的操作//cvReleaseImage(&img);cvDestroyWindow("image");cvReleaseVideoWriter(&writer);cvReleaseCapture(&capture); return 0;}