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  public static function TheoraPixelFormat($pixelformat_id) {
    // http://www.theora.org/doc/Theora.pdf (table 6.4)
    static $TheoraPixelFormatLookup = array();
    if (empty($TheoraPixelFormatLookup)) {
      $TheoraPixelFormatLookup[0] = '4:2:0';
      $TheoraPixelFormatLookup[1] = 'Reserved';
      $TheoraPixelFormatLookup[2] = '4:2:2';
      $TheoraPixelFormatLookup[3] = '4:4:4';
    }
    return (isset($TheoraPixelFormatLookup[$pixelformat_id]) ? $TheoraPixelFormatLookup[$pixelformat_id] : null);
  }