（转）OpenCV提取视频每一帧及将连续图片合成视频

参考博文：http://blog.sina.com.cn/s/blog_60b330b801018s0u.html

运行环境：Win7 OpenCV1.0 VC6.0，下面生成视频的代码用到的是XVID编码器，如果电脑上没有需要下载，否则生成的视频文件大小为0。或者将cvCreateVideoWriter("out.avi",CV_FOURCC('X','V','I','D'),fps,cvSize(frameW,frameH),isColor)的'X','V','I','D'修改为电脑上已有的编码器即可。

注：是将多张图像合并成视频的，所以最后生成的视频是没有声音的。

 1 // 该程序实现视频和图片的相互转换.
 2 // Image_to_video()函数将一组图片合成AVI视频文件.
 3 // Video_to_image()函数将AVI视频文件读入，将每一帧存储为jpg文件.
 4 //
 5 ////////////////////////////////////////////////////////////////////////
 6 #include <stdlib.h>
 7 #include <stdio.h>
 8 #include <math.h>
 9 #include <cv.h>
10 #include <highgui.h>
11 #define NUM_FRAME 300 //只处理前300帧，根据视频帧数可修改
12 
13 void Video_to_image(char* filename)
14 {
15     printf("------------- video to image ... ----------------
");
16     //初始化一个视频文件捕捉器
17     CvCapture* capture = cvCaptureFromAVI(filename);
18     //获取视频信息
19     cvQueryFrame(capture);
20     int frameH = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);
21     int frameW = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);
22     int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
23     int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);
24     printf("	video height : %d
	video width : %d
	fps : %d
	frame numbers : %d
", frameH, frameW, fps, numFrames);
25     //定义和初始化变量
26     int i = 0;
27     IplImage* img = 0;
28     char image_name[13];
29 
30     cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );
31     //读取和显示
32     while(1)
33     {
34 
35         img = cvQueryFrame(capture); //获取一帧图片
36         cvShowImage( "mainWin", img ); //将其显示
37         char key = cvWaitKey(20);
38 
39         sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");//保存的图片名
40 
41         cvSaveImage( image_name, img); //保存一帧图片 
42 
43         if(i == NUM_FRAME) break;
44     }
45     cvReleaseCapture(&capture);
46     cvDestroyWindow("mainWin");
47 }
48 void Image_to_video()
49 {
50     int i = 0;
51     IplImage* img = 0;
52     char image_name[13];
53     printf("------------- image to video ... ----------------
");
54     //初始化视频编写器，参数根据实际视频文件修改
55     CvVideoWriter *writer = 0;
56     int isColor = 1;
57     int fps = 30; // or 25
58     int frameW = 400; // 744 for firewire cameras
59     int frameH = 240; // 480 for firewire cameras
60     writer=cvCreateVideoWriter("out.avi",CV_FOURCC('X','V','I','D'),fps,cvSize(frameW,frameH),isColor);
61     printf("	video height : %d
	video width : %d
	fps : %d
", frameH, frameW, fps);
62     //创建窗口
63     cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );
64     while(i<NUM_FRAME)
65     {
66         sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");
67         img = cvLoadImage(image_name);
68         if(!img)
69         {
70             printf("Could not load image file...
");
71             exit(0);
72         }
73         cvShowImage("mainWin", img);
74         char key = cvWaitKey(20);
75         cvWriteFrame(writer, img);
76     }
77     cvReleaseVideoWriter(&writer);
78     cvDestroyWindow("mainWin");
79 }
80 
81 int main(int argc, char *argv[])
82 {
83     char filename[13] = "infile.avi";
84     Video_to_image(filename); //视频转图片
85     Image_to_video(); //图片转视频
86     return 0;
87 }
88 //--------------------------------------------------------------------------------