Forcing SSL Return For YouTube oEmbed

you could hack a forced https return in the functions.php file to search for iframes that have a src starting with http://www.youtu or http://youtu and replace with https://www.yout and https://yout respectively. [I left off the ‘be’ of these urls since some of the share urls are youtu.be and youtube.com]

//Embed Video Fix
	function add_secure_video_options($html) {
	   if (strpos($html, "<iframe" ) !== false) {
	    	$search = array('src="http://www.youtu','src="http://youtu');
			$replace = array('src="https://www.youtu','src="https://youtu');
			$html = str_replace($search, $replace, $html);

	   		return $html;
	   } else {
	        return $html;
	   }
	}
	add_filter('the_content', 'add_secure_video_options', 10);

Thank you troutacular! I was looking for a way to add YouTube’s privacy mode to the built-in YouTube embed (and embed shortcode), so I modified your filter like this:

//BEGIN Embed Video Fix - HTTPS and privacy mode
	function add_secure_video_options($html) {
	   if (strpos($html, "<iframe" ) !== false) {
	    	$search = array('src="http://www.youtube.com','src="http://youtube.com');
			$replace = array('src="https://www.youtube-nocookie.com','src="https://youtube-nocookie.com');
			$html = str_replace($search, $replace, $html);

	   		return $html;
	   } else {
	        return $html;
	   }
	}
	add_filter('the_content', 'add_secure_video_options', 10);
//END Embed Video Fix - HTTPS and privacy mode

Embedding using youtu.be URLs didn’t work for me, so I changed that bit to youtube.com.