import xml.etree.ElementTree as ET

fmt = '%02d:%02d:%02d,%03d'
def to_time(m_sec):
  mm = m_sec % 1000
  s = m_sec // 1000 % 60
  m = m_sec // 1000 // 60 % 60
  h = m_sec // 1000 // 60 // 60
  return (h, m, s, mm)

def fmt_time(t, d):
  start = int(t)
  end = start + int(d)
  t1 = fmt % to_time(start)
  t2 = fmt % to_time(end)
  return f'{t1} --> {t2}'

def fmt_line(n, d, s):
  return '%d\n%s\n%s\n\n' % (n, d, s)
  

if __name__ == '__main__':
  # run with python timedtext2srt.py {timedtext} {srt}
  import sys
  input = sys.argv[1]
  output = sys.argv[2]
  
  tree = ET.parse(input)
  root = tree.getroot()

  with open(output, 'w') as f:
    for n, line in enumerate(root.iter('p')):
      attr = line.attrib
      t = attr['t']
      d = attr['d']
      f.write(fmt_line(n, fmt_time(t, d), line.text))