def get_timestamp(duration):
    hr = math.floor((duration / 3600000))
    total_min = (duration % 3600000)
    mins = math.floor((total_min / 60000))
    total_secs = (total_min % 60000)
    secs = math.floor((total_secs / 1000))
    milisecs = (total_min % 1000)
    return '{:02d}:{:02d}:{:02d},{:03d}'.format(hr, mins, secs, milisecs)
def get_timestamp(duration):
    hr = math.floor((duration / 3600000))
    total_min = (duration % 3600000)
    mins = math.floor((total_min / 60000))
    total_secs = (total_min % 60000)
    secs = math.floor((total_secs / 1000))
    milisecs = (total_min % 1000)
    return '{:02d}:{:02d}:{:02d},{:03d}'.format(hr, mins, secs, milisecs)