视频播放控制

#include "highgui.h"
#include"cv.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( "video" , CV_WINDOW_AUTOSIZE );
	g_capture = cvCreateFileCapture( "H:\\红外森林防火项目\\火焰视频\\火焰1.avi" );
	int frames = (int) cvGetCaptureProperty( g_capture , CV_CAP_PROP_FRAME_COUNT );

	if ( frames!= 0 )
	{
		cvCreateTrackbar( "Position" , "video" , &g_slider_position , frames , onTrackbarSlide );
	}

	IplImage* frame;
	while( 1 )
	{
		frame = cvQueryFrame( g_capture );
		if( !frame ) break;
		cvShowImage( "video" , frame );
		char c = cvWaitKey( 33 );
		if( c == 27 ) break;
	}
	cvReleaseCapture( &g_capture );
	cvDestroyWindow( "video" );
	return 0;
}