Slider not working

[garlontas]

The slider isn't moving in many cases.
I think it is because of that code which tries to get position for slider:

 while True:
     success, position = self._player.query_position(Gst.Format.TIME)
     if success:
         position = float(position) / Gst.SECOND
             break
        return position

It doesn't exit the while loop.
The while loop was thought to accelerate the CD in order to get the position (it works only if the CD is rotating fast enough).