返回时C++内存问题opencv写的

//读取摄像头并保存为AVI文件

#include "cv.h"
#include "highgui.h"

int main(int argc,char**argv)
{
CvCapture* capture=0;
IplImage *bgr_frame;
int fps=25;
int i;
CvSize size;
CvVideoWriter *writer;
cvNamedWindow("Jimmy",CV_WINDOW_AUTOSIZE);

//从摄像头读取视频
if(argc==1)
{
    capture=cvCreateCameraCapture(0);
}
else
{
    capture=cvCreateFileCapture(argv[1]);
}
assert(capture!=NULL);
size=cvSize((int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH),(int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT));

writer=cvCreateVideoWriter("out.avi",CV_FOURCC('F','L','V','1'),fps,size,1);

//视频存磁盘
for(i=1;i<=100;i++)
{
    bgr_frame=cvQueryFrame(capture);
    cvWriteFrame(writer,bgr_frame);
    cvShowImage("Jimmy",bgr_frame);
    cvWaitKey(1000/fps);
}

cvReleaseVideoWriter(&writer);
cvReleaseImage(&bgr_frame);
cvReleaseCapture(&capture);
cvDestroyWindow("Jimmy");
return 0;

}

这个程序能正常执行，但是返回时会报错，我内存都释放了，实在不知道错在哪
Unhandled exception at 0x7656c42d in hw.exe: Microsoft C++ exception: cv::Exception at memory location 0x0033f7f0..

断点调试一下，看出错的callstack