sS transformTimestampAccordingToCut(S ts, L<DoubleRange> segments) {
  try {
    double time = ffmpeg_parseTimestamp(ts);
    int idx = predIndex(segments, r -> r.a <= time);
    if (idx >= 0 && idx < l(segments)) {
      double len = 0;
      for i to idx: len += l(segments.get(i));
      ret formatHoursMinutesColonSeconds(len+time-segments.get(idx).a);
    } else
      ret "[cut] " + ts;
  } catch print e {
    ret ts;
  }
  tok = matchCodeTokens(tok, t ->
    transformTimestampAccordingToCut(t, segments));
  ret join(tok);
}