Ubuntu is ... All About Video.
Video is another place that Ubuntu Linux is now very solid. There are several excellent choices for video players available. These include Dragon Player on KDE, Totem on GNOME and mplayer or VLC on KDE or GNOME. As with all Linux applications you can use any of these players regardless of whether you are using KDE or GNOME.
Dragon Player is your basic KDE video player. The interface is basic and the controls simple. Perfect for the Linux beginner or the Linux expert that wants a simple clean video player.
Totem, very much like Dragon Player, is also a very basic video player. Like Dragon Player however, don't let the simple controls and basic interface fool you. These two players can meet most of your basic video needs.
I encourage you to try out Dragon Player if you are using KDE and Totem if you are using GNOME because they are installed by default on each desktop environment. Like I said, you can run either on KDE or GNOME but in this case they are so similar you are probably best off using the one that comes included with your DE (Desktop Environment).
While Dragon Player and Totem for Ubuntu Linux are the default media players on their respective desktop environments, if you find yourself needing functions that these basic players don't provide, you do have other excellent choices. This is Linux after-all. These choices include, but are not limited to, the well-established mplayer and the very popular VLC. Both these programs offer a plethora of options and, in most cases, will meet all your advanced video watching needs.