A little modification for a plugin for Wordpress

In my wordpress site I have a Custom Youtube Player, and in Post Edit have a Custom Meta Box for Input directly the Youtube Video ID (11 Characters). I want to check if Youtube Videos are broken or not, through the public plugin called "Broken Link Checker", but the plugin cant recognize Youtube Video URLs because the content of Custom Meta Box only contents Youtube Video ID. For the plugin will work is necesary to edit the parser "[login to view URL]" for convert content of Custom Meta Box to a full Youtube URL like this format: [login to view URL] , for it is necesary to the parser add the string "[login to view URL]" before the content of Custom Meta Box and then create a valid Youtube Full URL for the plugin can check if is broken or not. More explanation about this is in the Ofiical Support Page of the Plugin: [login to view URL] Thanks.