code: public String toISODurationWithFrames(final boolean includeDays)
  	{
  		if (includeDays && days != 0)
  			return String.format("P%02dDT%02dH%02dM%02dS%02dF", days, hours, minutes, seconds, frames);
  		else
  			return String.format("PT%02dH%02dM%02dS%02dF", hours, minutes, seconds, frames);
  	}
docs: Returns the timecode in a format that is similar to the ISO 8601 Duration format, except with an <strong>F</strong> field
  for frames.
  
  @return