opencv把图片转换为视频，再读取视频并显示

#include <cv.h>

#include <highgui.h>

#include <stdio.h>

int main()

{

IplImage *img=cvLoadImage("0.bmp",0);

IplImage *img1=cvLoadImage("10.bmp",0);

IplImage *temp=cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);

CvVideoWriter * pwriter;

pwriter=cvCreateVideoWriter("my.avi",0 ,20,cvGetSize(img),1);

printf("%x\n",pwriter);

int num=100;

while(num>0)

{

if(num%2==0)

cvCopy(img,temp);

else

cvCopy(img1,temp);

int result=cvWriteFrame(pwriter,temp);

num--;

}

cvReleaseVideoWriter(&pwriter);

cvReleaseImage(&img);

    //=======================================================

    CvCapture * capture = cvCreateFileCapture ("my.avi");  //读取视频

    if(capture==NULL)

{

printf("NO capture");    //读取不成功，则标识

return 1;

};    

    double fps=cvGetCaptureProperty(capture, CV_CAP_PROP_FPS );   //读取视频的帧率

int vfps = 1000 / fps;                                        //计算每帧播放的时间

    printf("%5.1f\t%5d\n",fps,vfps);                             

double frames=cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_COUNT);//读取视频中有多少帧

printf("frames is %f\n",frames);

cvNamedWindow("example",CV_WINDOW_AUTOSIZE);                  //定义窗口

IplImage * frame;

while(1)

{ 

frame = cvQueryFrame( capture );  

if(!frame)

break;

float ratio = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_AVI_RATIO);     //读取该帧在视频中的相对位置

printf("%f\n",ratio);

cvShowImage("example",frame);                          //显示

char c = cvWaitKey(vfps);

if(c == 27 )break;

}

cvReleaseCapture(&capture);

cvDestroyWindow("example");

return 0;

}