Editing Dolby Digital (section)

=== Dolby Digital Plus ===
{{Main|Dolby Digital Plus}}
{{Infobox file format
|name = Dolby E-AC-3
|extension = 
|mime = audio/eac3
|uniform type = public.enhanced-ac3-audio<ref>{{cite web |url=https://developer.apple.com/documentation/avfoundation/avfiletypeenhancedac3 |title=AVFileTypeEnhancedAC3 |work=Apple Developer Documentation |publisher=[[Apple Inc]]}}</ref>
}}
E-AC-3 (Dolby Digital Plus) is an enhanced coding system based on the AC-3 [[codec]]. It offers increased [[bit rate]]s (up to {{nowrap|6.144 Mbit/s}}), support for even more [[audio channel]]s (up to 15.1 discrete channels<ref>{{Cite web|url=https://www.dolby.com/us/en/technologies/dolby-digital-plus-audio-coding-tech-paper.pdf|title=Dolby Digital Plus Audio Coding Tech Paper|access-date=2017-04-24|archive-date=2019-05-02|archive-url=https://web.archive.org/web/20190502061841/https://www.dolby.com/us/en/technologies/dolby-digital-plus-audio-coding-tech-paper.pdf|url-status=dead}}</ref> in the future), and improved coding techniques (only at low data rates) to reduce [[compression artifacts]], enabling lower data rates than those supported by AC-3 (e.g. 5.1-channel audio at {{nowrap|256 kbit/s}}). It is not backward compatible with existing AC-3 hardware, though E-AC-3 [[codec]]s generally are capable of [[transcoding]] to AC-3 for equipment connected via [[S/PDIF]]. E-AC-3 decoders can also decode AC-3 bitstreams. The fourth generation Apple TV supports E-AC-3.<ref>{{cite web|url=https://www.apple.com/tv/specs/|title=Apple TV – Tech Specs|access-date=1 January 2017}}</ref> The discontinued [[HD DVD]] system directly supported E-AC-3. [[Blu-ray Disc]] offers E-AC-3 as an option to [[wikt:graft|graft]] added channels onto an otherwise [[5.1]] AC-3 stream, as well as for delivery of secondary audio content (e.g. director's commentary) that is intended to be mixed with the primary audio soundtrack in the Blu-ray Disc player.