/*請從命令行模式啓動 cmd cd*/
#include "cv.h"
#include "highgui.h"
/*
OK, you caught us. Video playback under linux is still just bad. Part of this is due to FFMPEG, part of this
is due to lack of standards in video files. But the position slider here will often not work. We tried to at least
find number of frames using the "getAVIFrames" hack below. Terrible. But, this file shows something of how to
put a slider up and play with it. Sorry.
*/
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( "Example2_3", CV_WINDOW_AUTOSIZE );
g_capture = cvCreateFileCapture( argv[1] );
int frames = (int) cvGetCaptureProperty(
g_capture,
CV_CAP_PROP_FRAME_COUNT
);
if(frames!=0){
cvCreateTrackbar(
"Position",
"Example2_3",
&g_slider_position,
frames,
onTrackbarSlide
);
}
IplImage* frame;
while(1) {
frame = cvQueryFrame( g_capture );
if( !frame ) break;
// int frames = cvGetCaptureProperty( g_capture, CV_CAP_PROP_POS_FRAMES);//This should work, sometimes it does not on linux
cvShowImage( "Example2_3", frame );
char c = (char)cvWaitKey(33);
if( c == 27 ) break;
}
cvReleaseCapture( &g_capture );
cvDestroyWindow( "Example2_3" );
return(0);
}