The original version is called Interop DCP. In practice, there are two versions of composition in use. The encryption used is AES 128-bit in CBC mode. Encryption may optionally be applied to the essence of a track file to protect it from unauthorized use. The Picture Track File essence is compressed using JPEG 2000 and the Audio Track File carries a 24-bit linear PCM uncompressed multichannel WAV file. However, as already noted, it is commonplace in the industry to discuss the title in terms of a DCP, as that is the deliverable to the cinema.
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It must be underscored that a composition is a complete representation of a title version, while the DCP need not carry a full composition. The composition, consisting of a Composition Playlist and associated track files, are distributed as a Digital Cinema Package (DCP).
Two track files at a minimum must be present in every composition (see SMPTE ST429-2 D-Cinema Packaging – DCP Constraints, or Cinepedia ): a track file carrying picture essence, and a track file carrying audio essence. Track Files carry the essence, which is wrapped using Material eXchange Format (MXF). The composition consists of a Composition Playlist (in XML format) that defines the playback sequence of a set of Track Files. not a complete set of files), a single complete composition, or multiple and complete compositions. The DCP may carry a partial composition (e.g. ) A DCP is a “packing crate” for compositions, a hierarchical file structure that represents a title version. ("You PLAY a composition, You do NOT play a Digital Cinema Package". However, the industry tends to apply the term to the structure more formally known as the composition. The term was popularized by Digital Cinema Initiatives, LLC in its original recommendation for packaging DC contents. It is user friendly, meaning that it can be used with even by less experienced users.A Digital Cinema Package ( DCP) is a collection of digital files used to store and convey digital cinema (DC) audio, image, and data streams.
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