def reset(self):
"""
init internal data here
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
"""
self.layer = 0
self.start = AssTime()
self.end = AssTime()
self.style = ''
self.name = ''
self.marginl = 0
self.marginr = 0
self.marginv = 0
self.effect = ''
self.text = AssText()
