def ms_to_mmss(ms, decimals=0, negative=False):
    if not ms:
        return "-"
    sign = ""
    if ms < 0:
        if negative:
            sign = "-"
        else:
            ms = 0

    minutes, remainder = divmod(ms, 60 * 1000)
    seconds = remainder / 1000

    # if seconds >= 59.5, it will be represented as 60, which looks odd.
    # So, fake it under those circumstances
    if seconds >= 59.5:
        seconds = 59.0

    return f"{sign}{minutes:.0f}:{seconds:02.{decimals}f}"