Thumbnail Size is Inconsistent

V 0.4.7.  When not playing a video, the embedded video has one format.  Once we hit play, the video is narrower than the embedded space. It places fine but it is a very odd viewing experience.  It used to work as expected but several months ago switched to this.

You can see an example here:

http://mangolassi.it/topic/73/storage-and-raid-talk-at-spicecorps-dfw-2010
