Opencv显示视频

#include "cv.h"
#include "highgui.h"
#include <stdio.h>
int g_slider_position =0;
CvCapture * g_capture = NULL;
void onTrackbarSlide(int pos){
    cvSetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES,pos);
}
int main(int argc ,char **argv)
{
    cvNamedWindow("Myvideo",CV_WINDOW_AUTOSIZE);
    g_capture =cvCreateFileCapture(argv[1]);
    int frames=(int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FRAME_COUNT);
    if(frames!=0){
        cvCreateTrackbar("position","Myvideo",&g_slider_position,frames,onTrackbarSlide);
    }
    IplImage* frame;
    while(1){
        frame = cvQueryFrame(g_capture);
        cvCreateTrackbar("position","Myvideo",&g_slider_position,frames,onTrackbarSlide);
        g_slider_position++;
        if( !frame)
            break;
        cvShowImage("Myvideo",frame);
        char c =cvWaitKey(33);
        if(c==27)
            break;
    }
    cvReleaseCapture(&g_capture);
    cvDestroyWindow("Myvideo");
}