这是视频和图像读取的正确代码。我不知道确切的错误是什么。但是使用与 orieally 不同的代码可以帮助我以不同的方式完成任务。
// newproject.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "highgui.h"
#include <stdio.h>
#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <conio.h>
#include <opencv2/imgproc/imgproc.hpp> // Gaussian Blur
#include <opencv2/core/core.hpp> // Basic OpenCV structures (cv::Mat, Scalar)
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <conio.h>
using namespace cv;
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
//Image Reading
IplImage* img = cvLoadImage( "b.jpg" );
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage( "Example1", img );
cvWaitKey(0);
cvReleaseImage( &img );
cvDestroyWindow( "Example1" );
//Video Reading
// cvNamedWindow( "Example2", CV_WINDOW_AUTOSIZE );
// CvCapture* capture = cvCreateFileCapture( "video.avi" );
// IplImage* frame;
/* while(1) {
frame = cvQueryFrame( capture );
if( !frame ) break;
cvShowImage( "Example2", frame );
char c = cvWaitKey(33);
if( c == 27 ) break;//if user enter escape key then exit
}*/
//Summarize by sampling
CvCapture* capture = 0;
capture = cvCreateFileCapture( "video.avi" );
if(!capture){
return -1;
}
IplImage *bgr_frame=cvQueryFrame(capture);//Init the video read
double fps = cvGetCaptureProperty (capture,CV_CAP_PROP_FPS);
CvSize size = cvSize((int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH),(int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT));
//double fps = cvGetCaptureProperty (capture,CV_CAP_PROP_FPS);
CvVideoWriter *writer = cvCreateVideoWriter("Ayesha",CV_FOURCC('M','J','P','G'),fps,size);
int x=0;
while(1){
x++;
bgr_frame = cvQueryFrame( capture );
if(!bgr_frame)
break;
if(x==19||x==21){
cvShowImage("Example2",bgr_frame);
cvWriteFrame( writer, bgr_frame );
}
if(x==20){
cvShowImage("Example2",bgr_frame);
cvWriteFrame( writer, bgr_frame );
x=0;
}
char c=cvWaitKey(30);
if (c==27) break;
}
cvReleaseVideoWriter( &writer );
cvReleaseCapture( &capture );
cvDestroyWindow( "Example2" );
}