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  public static function displayUnit($value) {
    // http://www.matroska.org/technical/specs/index.html#DisplayUnit
    static $units = array(
      0 => 'pixels',
      1 => 'centimeters',
      2 => 'inches',
      3 => 'Display Aspect Ratio');

    return (isset($units[$value]) ? $units[$value] : 'unknown');
  }