The XML file VOLINDEX is used to identify the volume order in the series. Openssl sha1 -binary "FILE_NAME" | openssl base64Ī single DCP may be stored in more than one medium (e.g., multiple hard disks). The hash value is the Base64 encoding of the SHA-1 checksum. In the following example, a reel is composed by picture and sound: The order is saved in XML format in this file each picture and sound reel is identified by its UUID. List of all files included in the DCP, in XML format.ĭefines the playback order during presentation. Sampling rate is 48,000 or 96,000 samples per second.In case of multilingual features, separate reels are required to convey different languages. Sound contents are stored in reels, too, corresponding to picture reels in number and duration. Maximum bit rate is 250 Mbit/s (1.3 MBytes per frame at 24 frame per second).XYZ' colorspace the prime mark indicates gamma encoding (gamma=2.6).12 bits per pixel precision (36 bits total).Full (2048 × 1080 or 4096 × 2160) (~1.9:1 aspect ratio, official name by DCI is Full Container.HDTV (1920 × 1080 or 3840 × 2160), 16:9 aspect ratio (~1.78:1) (although not specifically defined in the DCI specification, this resolution is DCI compliant per section 8.4.3.2).Maximum frame sizes are 2048 × 1080 for 2K DC, and 4096 × 2160 for 4K DC.24 and 48 fps 2K (MXF Interop can be encoded at 25 frame/s but support is not guaranteed).JPEG 2000 is the only accepted compression format. MPEG-2 is no longer compliant with the DCI specification. Each reel contains pictures as MPEG-2 or JPEG 2000 essence, depending on the adopted codec. Picture contents may be stored in one or more reels corresponding to one or more MXF files. The DCP root folder (in the storage medium) contains a number of files, some used to store the image and audio contents, and some other used to organize and manage the whole playlist. While legacy support for Interop DCP is necessary for commercial products, new productions are encouraged to distribute in SMPTE DCP. SMPTE DCP requires significant constraints to ensure success in the field, as shown by ISDCF. SMPTE DCP is similar but not backwards compatible with Interop DCP, resulting in an uphill effort to transition the industry from Interop DCP to SMPTE DCP. In 2009, a specification was published by SMPTE (SMPTE ST 429-2 Digital Cinema Packaging – DCP Constraints) for what is commonly referred to as SMPTE DCP. 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. 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. 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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