@classmethod
def parse_timecode(cls, timecode):
    """parses timecode string frames '00:00:00:00' or '00:00:00;00' or
        milliseconds '00:00:00:000'
        """
    bfr = timecode.replace(';', ':').replace('.', ':').split(':')
    hrs = int(bfr[0])
    mins = int(bfr[1])
    secs = int(bfr[2])
    frs = int(bfr[3])
    return hrs, mins, secs, frs
