#include"highgui.h"

#include"cv.h"

int g_slider_position = ;

CvCapture* g_capture = NULL;

void onTrackbarSlide(int pos){

    cvSetCaptureProperty(g_capture,

        CV_CAP_PROP_POS_FRAMES, pos);//CV_CAP_PROP_POS_FRAMES - 将被下一步解压/获取的帧索引，以0为起点

}

int main()

{

    g_capture = cvCreateFileCapture("D:\\Opencv\\testData\\video.avi");

    cvNamedWindow("Video", CV_WINDOW_AUTOSIZE);

    IplImage* frame;

    int frames = (int)cvGetCaptureProperty(g_capture,

        CV_CAP_PROP_FRAME_COUNT);//CV_CAP_PROP_FRAME_COUNT - 视频文件中帧的总数

    if (frames != ){

        cvCreateTrackbar("Position", "Video", &g_slider_position, frames, onTrackbarSlide);

    }

    while (){

        frame = cvQueryFrame(g_capture);

        if (!frame) break;

        cvShowImage("Video", frame);

        cvWaitKey();

    }

    cvReleaseCapture(&g_capture);

    cvDestroyWindow("Video");

    return ;

}