读入视频文件并缩放后存入磁盘

来源：互联网发布：哪个软件听音乐最好编辑：程序博客网时间：2024/06/09 16:38

练习：从本地读入视频数据并将缩放变换后的彩色图像存入磁盘

#include "cv.h"#include "highgui.h"int main(){//定义两个窗口用来显示视频缩放后的结果cvNamedWindow("in",1);cvNamedWindow("out",1);//读入视频文件CvCapture *capture=cvCreateFileCapture("testVideo.avi");if(!capture)return -1;IplImage *frame=cvQueryFrame(capture);//获取视频帧assert(frame->width%2==0&&frame->height%2==0);IplImage *out=cvCreateImage(cvSize(frame->width/2,frame->height/2),frame->depth,frame->nChannels);//定义新视频帧大小CvSize size=cvSize((int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH)/2,  (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT)/2);//获取原视频帧率int   fps=(int)cvGetCaptureProperty(capture,CV_CAP_PROP_FPS);CvVideoWriter *writer=cvCreateVideoWriter("out.avi",CV_FOURCC('X','V','I','D'),fps,size);while((frame=cvQueryFrame(capture))!=NULL){   cvPyrDown(frame,out,CV_GAUSSIAN_5x5);out->origin=1;cvWriteFrame(writer,out);cvShowImage("in",frame);cvShowImage("out",out);cvWaitKey(33);}cvReleaseVideoWriter(&writer);cvReleaseImage(&out);cvReleaseCapture(&capture);cvDestroyWindow("in");cvDestroyWindow("out");return 0;}

程序运行结果：

可以看到out.avi保存成功了，如下图：

0 0