Convert a millisecond value to a string of the following
    format:

        HH:MM:SS,SS

    with 10 millisecond precision. Note the , seperator in
    the seconds.

def timestr(msec):
    """
    Convert a millisecond value to a string of the following
    format:

        HH:MM:SS,SS

    with 10 millisecond precision. Note the , seperator in
    the seconds.
    """
    sec = float(msec) / 1000

    hours = int(sec / 3600)
    sec -= hours * 3600

    minutes = int(sec / 60)
    sec -= minutes * 60

    output = "%02d:%02d:%06.3f" % (hours, minutes, sec)
    return output.replace(".", ",")