@classmethod
def range_to_gstclocktimes(cls, time_range):
    """
        Convert an otio TimeRange to a tuple of the start_time and
        duration as ints representing the times in nanoseconds.
        """
    return cls.rat_to_gstclocktime(time_range.start_time
        ), cls.rat_to_gstclocktime(time_range.duration)
