http://blogs.msdn.com/ashtat/archive/2009/06/20/video-playback-in-xna-game-studio-3-1.aspxMichael did a post some time back to give an overview of the new video playback feature. Here’re some additional tips that might help - Adding video to your project In a nutshell - make sure your videos are encoded with Windows Media Video v9 codecs,en-USCommunityServer 2.1 SP1 (Build: 61025.2)