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    // 5.1 WebVTT file parsing.
    try {
      var line = void 0;
      if (self.state === 'INITIAL') {
        // We can't start parsing until we have the first line.
        if (!/\r\n|\n/.test(self.buffer)) {
          return this;
        }

        line = collectNextLine();
        // strip of UTF-8 BOM if any
        // https://en.wikipedia.org/wiki/Byte_order_mark#UTF-8
        var m = line.match(/^()?WEBVTT([ \t].*)?$/);
        if (!m || !m[0]) {
          throw new Error('Malformed WebVTT signature.');
        }

        self.state = 'HEADER';
      }

      var alreadyCollectedLine = false;