convert SubRip subtitles to WebVTT (suitable for WebM format)

srt2vtt.py

#!/usr/bin/env python

import sys
import re

with open(sys.argv[1], 'r') as infile:
    data = infile.readlines()

timecodere = re.compile("^\d*:\d\d:\d\d,\d\d\d --> \d*:\d\d:\d\d,\d\d\d")

outdata = []
for line in data:
    if timecodere.match(line):
        outdata.append(line.replace(",", "."))
    else:
        outdata.append(line)

with open(sys.argv[1] + ".vtt", 'w') as outfile:
    outfile.write("WEBVTT\n\n")
    outfile.writelines(outdata)