protected function parseEncoder($lines) {
    $encoders = array();
    foreach ($lines as $line) {
      if (preg_match('/^\s+([A-Z .]+)\s+(\w{2,})\s+(.*)$/', $line, $m)) {
        $type = trim($m[1]);
        if (strpos($type, 'E') !== false) {
          $encoder = trim($m[2]);
          if (strpos($encoder, ',') !== false) {
            foreach (split(',', $encoder) as $e) {
              $encoders[] = $e;
            }
          } else {
            $encoders[] = $encoder;
          }
        }
      }
    }

    sort($encoders);
    return $encoders;
  }