It worked for me, however...
It worked for me, thank you! However, you MUST include the "&" which previous poster kdeniss omitted in the link he/she provided. Also, I found that it doesn't work if you just add the extension to the "shortened" URL that is provided in the share URL box. You must add it to the original "long" URL that shows up in the URL box at the top of your screen when the video is loaded. Add the extension to that and THEN you can shorten the URL by using tinyurl or other url shortening software/sites if you desire.