阿洲程式天地

記得在while迴圈要設條件break跳出迴圈，否則avi檔無法開啟

#include <cv.h>
#include <highgui.h>
#include <stdio.h>

int main()
{
    CvCapture *capture;
    IplImage *frame;

    capture=cvCreateCameraCapture(0);
    cvNamedWindow("Webcam",0);

    CvVideoWriter *writer;
    char AviFileName[]="Output.avi";
    int AviForamt = -1;
    int FPS = 30;
    CvSize AviSize = cvSize(640,480);
    writer=cvCreateVideoWriter(AviFileName,AviForamt,FPS,AviSize);

    while(true)
    {
        frame = cvQueryFrame(capture);
        cvWriteFrame(writer,frame);
        if(cvWaitKey(20)>0)     break;
    }

    cvReleaseCapture(&capture);
    cvReleaseVideoWriter(&writer);
    cvDestroyWindow("Webcam");
}

同時錄製兩個不同播放速度的avi檔：

#include <cv.h>
#include <highgui.h>
#include <stdio.h>

int main()
{
  CvCapture *capture;
  IplImage *frame1;
  IplImage *frame2;
  capture=cvCreateCameraCapture(0);
  cvNamedWindow("Webcam",0);

  CvVideoWriter *writer1;
  CvVideoWriter *writer2;
  char AviFileName1[]="Output.avi";
  char AviFileName2[]="Out.avi";
  int AviForamt = -1;
  int FPS1 = 25;
  int FPS2 = 5;
  CvSize AviSize = cvSize(640,480);
  int AviColor = 1;
  writer1=cvCreateVideoWriter(AviFileName1,AviForamt,FPS1,AviSize,AviColor);
  writer2=cvCreateVideoWriter(AviFileName2,AviForamt,FPS2,AviSize,AviColor);

  while(true)
  {
    frame1 = cvQueryFrame(capture);
    cvWriteFrame(writer1,frame1);
    cvWriteFrame(writer2,frame1);
    cvShowImage("Webcam",frame1);

    if(cvWaitKey(20)>0)
    break;
  }

  cvReleaseCapture(&capture);
  cvReleaseVideoWriter(&writer1);
  cvReleaseVideoWriter(&writer2);
  cvDestroyWindow("Webcam");
}