Python: Pequeno script para alterar o tempo de legendas no formato SRT

Publiquei no github um pequeno script que tem como propósito retardar ou adiantar o tempo de legendas nor formato "srt". Quem desejar fazer sugestões sinta-se a vontade.OBS: Antes de rodar o script instale as bibliotecas descritas no código.

	#!/usr/bin/env python
	# # -*- coding: UTF-8 -*-"
	# ----------------------------------------------------------
	# CREATED: Qua 05/Mar/2014 hs 10:24
	# LAST CHANGE: 2014 Mar 05 17:08:13
	# THIS SCRIPT AIM: fix subtitle files
	# AUTHOR: Sergio Luiz Araujo Silva
	# SITE: http://vivaotux.blogspot.com
	# TWITTER: @voyeg3r
	# Download: https://gist.github.com/voyeg3r/9375602
	# ----------------------------------------------------------
	# Install needed libs !!!!!
	# sudo easy_install pysrt3 pysrt argparse
	# Reference: http://tuxbalaji.wordpress.com/2013/10/05/how-to-fix-subtitles-delay-or-ealier-with-your-movies-by-python-code/
	# >>> subs.shift(seconds=-2) # Move all subs 2 seconds earlier
	# >>> subs.shift(minutes=1) # Move all subs 1 minutes later
	import pysrt, argparse
	parser = argparse.ArgumentParser(description='This is a script to change your subtitles')
	parser.add_argument('-i','--input', help='Input file name', required=True)
	parser.add_argument('-o','--output', help='Output file name', required=True)
	parser.add_argument('-t','--time', help='time shift in seconds', required=True, type=int)
	args=parser.parse_args()
	subs = pysrt.open(args.input)
	subs.shift(seconds=args.time)
	subs.save(args.output, encoding='utf-8')
	## show values ##
	#print ("Input file: %s" % args.input )
	#print ("Output file: %s" % args.output )
	#print ("Time shift: %s" % args.time)

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