Converts a Youtube closed captions xml to srt

xmltosrt.py

#!/usr/bin/python
import re
import sys
from datetime import datetime, timedelta

pattern = re.compile(r'<text start="([\d\.]+)" dur="([\d\.]+)">(.*?)</text>')
with open(sys.argv[1]) as fin:
    content = fin.read().decode('utf-8')

dini = datetime(2010, 1, 1)
with open(sys.argv[1] + '.srt', 'w') as fout:
    alist = pattern.findall(content)
    for i, (start, duration, text) in enumerate(alist, start=1):
        start = float(start)
        dstart = dini + timedelta(seconds=start)
        duration = float(duration)
        dend = dstart + timedelta(seconds=duration)
        fout.write(u'{}\n{} --> {}\n{}\n\n'.format(
            i,
            dstart.strftime('%H:%M:%S,%f')[:-3],
            dend.strftime('%H:%M:%S,%f')[:-3],
            text.strip(),
        ).encode('utf-8'))