$bbcode = new SBBCodeParser_BBCode('youtube', function($content, $attribs)
{
    if(substr($content, 0, 23) === 'http://www.youtube.com/')
        $uri = $content;
    else
        $uri = 'http://www.youtube.com/v/' . $content;

    return '';
}, SBBCodeParser_BBCode::BLOCK_TAG, false, array(), array('text_node'), SBBCodeParser_BBCode::AUTO_DETECT_EXCLUDE_ALL);

$parser->add_bbcode($bbcode);