code: public long getDurationMillis()
  	{
  		List<Element> durations = element.getChildren("Duration");
  
  		if (durations.size() != 0)
  		{
  			final String durationString = durations.get(0).getValue();
  
  			final long duration = Long.parseLong(durationString);
  
  			return duration;
  		}
  		else
  		{
  			throw new RuntimeException("No Duration elements present on track!");
  		}
  	}
docs: Gets duration of video track in milliseconds.
  
  @return