怎么用会声会影X4获得视频每一帧的图像

// 该程序实现视频和的相互转换

// Image_to_video()函数将一组合成AVI视频文件

// Video_to_image()函数将AVI视频文件读入，将每一帧存储为jpg文件

//

////////////////////////////////////////////////////////////////////////

#include <stdlibh>

#include <stdioh>

#include <mathh>

#include <cvh>

#include <highguih>

#define NUM_FRAME 300 //只处理前300帧，根据视频帧数可修改

void Video_to_image(char filename)

{

printf("------------- video to image ----------------\n");

//初始化一个视频文件捕捉器

CvCapture capture = cvCaptureFromAVI(filename);

//获取视频信息

cvQueryFrame(capture);

int frameH = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);

int frameW = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);

int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);

int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);

printf("\tvideo height : %d\n\tvideo width : %d\n\tfps : %d\n\tframe numbers : %d\n", frameH, frameW, fps, numFrames);

//定义和初始化变量

int i = 0;

IplImage img = 0;

char image_name[13];

cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );

//读取和显示

while(1)

{

img = cvQueryFrame(capture); //获取一帧

cvShowImage( "mainWin", img ); //将其显示

char key = cvWaitKey(20);

sprintf(image_name, "%s%d%s", "image", ++i, "jpg");//保存的名

cvSaveImage( image_name, img); //保存一帧

if(i == NUM_FRAME) break;

}

cvReleaseCapture(&capture);

cvDestroyWindow("mainWin");

}

void Image_to_video()

{

int i = 0;

IplImage img = 0;

char image_name[13];

printf("------------- image to video ----------------\n");

//初始化视频编写器，参数根据实际视频文件修改

CvVideoWriter writer = 0;

int isColor = 1;

int fps = 30; // or 25

int frameW = 400; // 744 for firewire cameras

int frameH = 240; // 480 for firewire cameras

writer=cvCreateVideoWriter("outavi",CV_FOURCC('X','V','I','D'),fps,cvSize(frameW,frameH),isColor);

printf("\tvideo height : %d\n\tvideo width : %d\n\tfps : %d\n", frameH, frameW, fps);

//创建窗口

cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );

while(i<NUM_FRAME)

{

sprintf(image_name, "%s%d%s", "image", ++i, "jpg");

img = cvLoadImage(image_name);

if(!img)

{

printf("Could not load image file\n");

exit(0);

}

cvShowImage("mainWin", img);

char key = cvWaitKey(20);

cvWriteFrame(writer, img);

}

cvReleaseVideoWriter(&writer);

cvDestroyWindow("mainWin");

}

int main(int argc, char argv[])

{

char filename[13] = "infileavi";

Video_to_image(filename); //视频转

Image_to_video(); //转视频

return 0;

}

//---------------------------------------------------

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