<P> Attempts to sync unsupported content to Apple TV will draw an error message from iTunes . </P> <P> The 1st and 2nd generation Apple TV video output can be set to either 1080i or 1080p; however, this resolution is limited to the user interface and the viewing of photographs--all other content is simply upscaled to those resolutions . Those models cannot play 1080i or 1080p video content (e.g., HD camera video). The 3rd and 4th generation Apple TV support 1080p video content . </P> <P> Apple offers H. 264 1080p movies and video podcasts on iTunes . In comparison, Blu - ray Disc films are 1080p H. 264 or VC - 1 video encoded at rates of up to 40 Mbit / s . </P> <P> Apple TV's audio chip supports 7.1 surround sound, and some high definition rentals from iTunes are offered with Dolby Digital 5.1 surround sound . </P>

How do i know what generation apple tv