Convert Subtitles in WebVTT format exported from Microsoft Stream to SRT

convert.py

# Conversion of Microsoft Stream WebVTT file to SRT
# Takes advantage of specific metadata structure in Microsoft Stream VTT files

vtt = open('INPUT.vtt','r')
vtt_iter = iter(vtt)

with open('OUTPUT.srt', 'w') as srt:
  counter = 1
  next(vtt_iter)
  for line in vtt_iter:
    if line.startswith('NOTE Confidence'):
      srt.write('\n' + str(counter) + '\n')
      counter+=1
      next(vtt_iter)
      next(vtt_iter)
      timewindow = next(vtt_iter)
      timewindow = timewindow.replace('.',',').rstrip('\r\n')
      srt.write(timewindow + '\n')
    else:
      if line.startswith('NOTE') or line.rstrip('\r\n') == '':
          continue
      else:
        srt.write(line.rstrip('\r\n') + '\n')

vtt.close()
srt.close()