OpenCV播放视频，滑动条随帧数动态变化

#include "highgui.h"intg_slider_position= 0;CvCapture*g_capture= NULL;void OnTrackbarSlide(int pos){cvSetCaptureProperty(g_capture,CV_CAP_PROP_POS_FRAMES,pos);g_slider_position = pos;}int main(){/*加载图像IplImage * img = cvLoadImage("C:\\1.jpg");cvNamedWindow("Test", CV_WINDOW_NORMAL);cvShowImage("Test", img);cvWaitKey(0);cvReleaseImage(&img);cvDestroyWindow("Test");*//*加载视频*/cvNamedWindow("Vedio");g_capture = cvCreateFileCapture("C:\\1.mp4");int frames = (int)cvGetCaptureProperty(g_capture, CV_CAP_PROP_FRAME_COUNT);if (frames!=0){cvCreateTrackbar("Position", "Vedio", &g_slider_position, frames, OnTrackbarSlide);}IplImage *frame;while (true){frame = cvQueryFrame(g_capture);if (!frame){break;}g_slider_position = (int)cvGetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES);cvSetTrackbarPos("Position", "Vedio", g_slider_position);printf("%d",g_slider_position);cvShowImage("Vedio", frame);char c = cvWaitKey(33);if (c == 27)break;}cvReleaseCapture(&g_capture);cvDestroyWindow("Vedio");return(0);}