OpenCV - getting the slider to update its position during video playback

Question

I\'ve picked up \'Learning OpenCV\' and have been trying some of the code examples/exercises. In this code snippet, I want to get the slider to update its position with each

Answer 1

You can try the solution below.

change this

void onTrackbarSlide(int pos)
{
    cvSetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES, pos);
}

to

void onTrackbarSlide( int pos )
{
    if( pos > g_slider_position + 1 )
    cvSetCaptureProperty( 
        g_capture, 
        CV_CAP_PROP_POS_FRAMES, 
        pos);
}

and also change this

cvSetTrackbarPos(
            "Position", 
            "The Tom 'n Jerry Show",
            ++g_slider_position
            );

to

cvSetTrackbarPos(
            "Position", 
            "The Tom 'n Jerry Show",
            g_slider_position + 1
            );