Convert youtube timedtext XML fromat to SRT subtitles

tt2srt.py

#!/usr/bin/env python
# Usage: python tt2srt.py source.xml output.srt
# Download the .xml file from youtube by using the Network tab
# on the browser Developer Tools, and searching for requests to
# the "timedtext" endpoint

from xml.dom.minidom import parse
import sys


def formatSrtTime(milliseconds):
	sec, milli = divmod(milliseconds, 1000)
	m, s = divmod(int(sec), 60)
	h, m = divmod(m, 60)
	return "{:02}:{:02}:{:02},{}".format(h,m,s,milli)


i=1
dom = parse(sys.argv[1])
out = open(sys.argv[2], 'w')
body = dom.getElementsByTagName("body")[0]
paras = body.getElementsByTagName("p")
for para in paras:
	out.write(str(i) + "\n")
	out.write(formatSrtTime(int(para.attributes['t'].value)) + ' --> ' + formatSrtTime(int(para.attributes['t'].value) + int(para.attributes['d'].value)) + "\n")
	for child in para.childNodes:
		if child.nodeName == 'br':
			out.write("\n")
		elif child.nodeName == '#text':
			out.write(unicode(child.data).encode('utf-8'))
		out.write("\n\n")
	i += 1