Re: Flash Media Player plugin with visual integration (play flv/mp4/mp3/aac files)

I would have to agree that this has something to do with your theme or some other setting. I downloaded the mp4 and pushed it to my server:

http://www.2rosenthals.net/coppermine/displayimage.php?album=22&pid=658#top_display_media

It seems to play fine ...