iFrame YouTube Videos Question

Can you tell me why the top two video links on this page have black bars top and bottom, and the other below do not have the black bars?

http://vectorworksexchange.com/resources/trianing_videos/

It’s Youtube issue I think, to do with inorrect aspect ratios… Have a look at this - https://www.onedesigns.com/support/topic/youtube-videos-with-black-bars-on-top-and-bottom

Rob

Got it fixed. Thanks.