opencv读取avi视频并抽取帧

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opencv读取avi视频并抽取帧

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#include "stdafx.h"
#include <opencv2/opencv.hpp>

using namespace std;
using namespace cv;

int main(int argc, char** argv)
{
   //cvNamedWindow("test", CV_WINDOW_AUTOSIZE);
   CvCapture* capture = cvCreateFileCapture("G://test.avi");//cvcapture 和 vediocapture 区别：一个是c一个是c++
   //获取视频总帧数
   int numFrames = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);
   cout << "视频总帧数为：" << numFrames << endl;
   //获取视频fps
   int fps = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
   cout << "fps:" << fps << endl;

   IplImage* frame;
   int pos = 0;
   while (1)
   {
       //抽取帧
       cvSetCaptureProperty(capture, CV_CAP_PROP_POS_FRAMES, pos);
       cout << pos << "/" << numFrames << endl;
       frame = cvQueryFrame(capture);

       //将IplImage转化为mat，方便以后进行处理
       Mat mat = cvarrToMat(frame);
       imshow("test", mat);

       char c = cvWaitKey(33);
       if (c == 27)
           break;

       //调整抽取帧的位置
       pos+=24;

   }
   cvReleaseCapture(&capture);
   cvDestroyWindow("test");
}

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