Opencv写视频文件

原文地址：Opencv写视频文件作者：Single

 

Opencv写视频文件核心函数

     cvCreateVideoWriter

    cvWriteFrame 

    cvReleaseVideoWriter

cvCreateVideoWriter

    cvCreateVideoWriter (const char*filename, int fourcc, double fps, CvSize frame_size, int is_color=1);

          filename ：指定新建视频的文件名字。

         fourcc ：视频压缩的编码格式，目前有多种流行的编解码格式，但无论采用哪种格式，都必须确认自己  的 电脑上安装了这种格式（编解码器的安装是独立于 opencv的）。

     例如： CV_FOURCC（'X','V','I','D'）

         fps ：帧率

           frame_size: 视频帧的大小。

        is_color: 如果非零，编 码器将希望得到彩色帧并进行编码 ，否则，是灰度帧

cvWriteFrame

         功能：把一帧图像写入到视频文件

cvReleaseVideoWriter

       释放视频写入设备，如果不释放，会导致写视频失败，所以一定要记得释放。

 

 

代码：

 

#include "stdafx.h"

#include "cv.h"

#include "highgui.h"

#include "cxcore.h"

#include <stdlib.h>

#include <stdio.h>

int main(int argc, char*argv[])

{

                CvSizesize = cvSize(480,360);

                 double fps =15;

                 //创建一个写视频设备writer

                CvVideoWriter*writer = cvCreateVideoWriter("F:\pf_\opencv\out.avi" ,CV_FOURCC('X', 'V','I' ,'D'),fps,size);

                 

                 int image_id = 1;

                 char filename[256];

                sprintf(filename, "F:\pf_\image\%d.jpg" ,image_id );

                 //加载图像

                IplImage*src = cvLoadImage(filename);

                 if(!src)

                {

                                 return 0;

                }

                 //为aresize后的图像分配空间

                IplImage*src_resize = cvCreateImage(size,8,3);

                

                cvNamedWindow( "avi");

                 while(src)

                {

                                 

                                cvShowImage( "avi",src_resize);

                                cvWaitKey(1);

                                 

                                cvResize(src, src_resize);

                                 

                                cvWriteFrame(writer, src_resize);

                                 

                                cvReleaseImage(&src);

                                 //加载文件夹中的下一幅图像

                                image_id++;

                                sprintf(filename, "F:\pf_\image\%d.jpg" ,image_id );

                                src= cvLoadImage(filename);

                }

                 

                cvReleaseVideoWriter(&writer);

                 

                cvReleaseImage(&src_resize);

                 return 0;

}