Move srt files

change_sub.py

import sys
import re

def add_time(pattern,to_add):
	first_pattern, d = pattern.split(',')
	a, b, c = [int(i) for i in first_pattern.split(':')]
	d = int(d)
	d -= to_add
	# if d < 0: 
	c += d / 1000
	d %= 1000
	# if c < 0:
	b += c / 60
	c %= 60
	# if b < 0:
	a += b / 60
	b %= 60

	return "%02d:%02d:%02d,%03d" % (a,b,c,d)

def main():
	try:
		filename = sys.argv[1]
		time_to_add = int(sys.argv[2])
	except:
		print "Missing arguments: filename and time in miliseconds"
		sys.exit()


	print "Adding " + str(time_to_add) + " miliseconds..."
	f = open(filename, 'r')
	# temporal file
	new_file = open('testing.srt','w')
	for line in f:
		aaa = re.match(r'(\d\d:\d\d:\d\d,\d\d\d) --> (\d\d:\d\d:\d\d,\d\d\d)', line)
		if aaa:
			pat1, pat2 = aaa.groups(0)
			new_file.write(add_time(pat1,time_to_add) + ' --> '+ add_time(pat2,time_to_add) + '\n')
		else:
			new_file.write(line)

	new_file.close()
	f.close()

if __name__ == '__main__':
	main()