Aerial screen savers aren't available on Apple TV (2nd and 3rd generation) Navigate to Settings -> General -> Screensaver -> Type -> Home Sharing.
To change the number of minutes before a screen saver starts, go to Settings > General > Screen Saver and select Start After. You can view information about the location shown, quickly switch to another location, and control how often Apple TV checks for and downloads new Aerial videos Just go to the top-left corner of the Home screen on your Apple TV and press the Menu button on your Apple TV Remote. The Aerial screen saver shows beautiful slow-motion videos of places around the world. Apple TV displays a screen saver after the screen is idle for a preset number of minutes.