A significant selling point of DVD Video is that the storage capacity allows for a wide variety of extra, or bonus, features in addition to the feature film. These extra features can include audio commentary; documentary features, commonly about the making of the main title; deleted scenes; photo galleries; storyboards; isolated music scores; trivia text commentary; simple games; film shorts; TV spots; radio spots; theatrical trailers which were used to promote the main title; and teaser trailers advertising related movies or DVDs.
Extra features often provide entertainment or add depth and understanding to the film. Games, bloopers, and galleries provide entertainment, especially for younger ages. Deleted scenes and alternative endings allow the audience to view additional content which was not included in a theatrical release. Directors cuts allow the audience to see how the director envisioned the main title without the constraints which are placed on a theatrical release.
Other extras that can be included on DVDs are motion menus, still pictures, up to 32 selectable subtitles, seamless branching for multiple storylines, up to 9 camera angles, and DVD-ROM / data files that can be accessed on a computer.
Extra features require additional storage space, which often means encoding the main title with lower than possible data rate to fit both the main title and the extras on one disc. Lower data rate may decrease visual and sound quality, which manifests itself in various digital artifacts. To maintain quality the main title and the extras may be released on several discs, or the extras may be omitted completely like in the "Superbit" line of DVDs.
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