functions.php

Although by default WP YouTube Lyte only works with httpv or httpa links and hence does not act on normal YouTube links (which are instead auto-handled by oEmbed in WordPress core), you can easily change this behavior by adding the following code-snippet to your theme’s function.php or to a separate “helper”-plugin:

/** force wp youtube lyte on http://www.youtube.com url's as well */
add_filter('the_content', 'force_lyte_parse', 1);
function force_lyte_parse($content) {
     $content=str_replace('http://www.youtube.com/watch?v=','httpv://www.youtube.com/watch?v=',$content);
     return $content;
}

Now that wasn’t too hard, now was it?