Why doesn disc X work in player Y?page up: DVD Formats FAQnext page: 1.43 Which discs include multiple camera angles?
DVD includes parental management features for blocking playback and for multiple versions of a movie on a single disc. Players (including software players on PCs) can be set to a parental level so that discs rated above that level will not play. As an alternative to a single rating for the entire disc (or ratings for different sections of the disc), a disc can be designed so that it plays a different version of the movie depending on the parental level that has been set in the player. By taking advantage of the seamless branching feature of DVD, objectionable scenes are automatically skipped over or replaced during playback. This requires that the disc be carefully authored with alternate scenes and branch points that don’t cause interruptions or discontinuities in the soundtrack. There is no standard way to identify which discs have multi-rated content. Unfortunately, very few multi-rating discs have been produced. Hollywood studios are not convinced that there is a big enough demand
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