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A Digital Cinema Package (DCP) is a collection of digital files used to store and convey Digital cinema (DC) audio, image, and data streams. 
  
数字电影包是一种数字文件集，用于存储和转换数字影像的音频、图像和数据流。 
  
The term has been defined by Digital Cinema Initiatives, LLC in their recommendations for packaging of DC contents. General practice adopts a file structure that is organized into a number of usually multi-gigabyte size Material eXchange Format (MXF) files, which are separately used to store audio and video streams, and auxiliary index files in XML format. 
  
该术语由数字电影倡导联盟（DCI）在对数字影像的打包建议中做出过定义。通用惯例采用一种文件结构来组织成多个通常有几个G大小的MXF文件，这些文件分别用来存储音频和视频流，以及XML格式的辅助索引文件。 
  
The MXF files contain streams that are compressed, encoded, and encrypted, in order to reduce the huge amount of required storage and to protect from unauthorized use. The image part is JPEG 2000 compressed, whereas the audio part is linear PCM. The adopted (optional) encryption standard is AES 128 bit in CBC mode. 
  
MXF文件包含有压缩、编码和加密的数据流，以此来减少所需的大量存储空间和防止未授权使用。图像部分是JPEG 2000压缩文件，然而音频部分是线性PCM（脉冲编码调制）。采用的加密标准是CBC模式中的AES-128位。 
  
The newer SMPTE standards are used to conform the recommendations among different tool vendors and producers. Interop, the legacy DCP standard, is still required to be supported by DCP players. 
  
较新的SMPTE标准用于使不同工具厂商和制片商的建议保持一致性。遗留的DCP标准仍需要各DCP播放器支持。 
  
Technical specifications 
  
技术说明书 
  
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. 
  
DCP根目录（存储介质里）包含有几个文件，有些用来存储图像和音频内容，有些用来组织和管理整个播放表单。 
 
  
Picture MXF files 
  
图片MXF文件 
  
Picture contents may be stored in one or more reels corresponding to one or more MXF files. Each reel contains pictures as MPEG-2 or JPEG 2000 essence, depending on the adopted codec. MPEG-2 is no longer compliant with the DCI specification. JPEG 2000 is the only accepted compression format. 
  
图片内容可能存储在与MXF文件相关的一个或多个卷里。每个卷里包含有类似MPEG-2或JPEG 2000 精髓的图片，这要看采用什么样的编码方式。MPEG-2不再与DCI规格相兼容，而JPEG 2000是唯一接受的压缩方式。 
  
Supported frame rates are 24, and 48 frames per second. DCPs conforming to older specifications could be encoded at 25fps. This is now outdated. 
Maximum frame size is 2048x1080 for 2K DC, and 4096x2160 for 4K DC. Common formats are:  
Flat (1998x1080 or 3996x2160), ~1.85:1 aspect ratio 
Scope (2048x858 or 4096x1716), ~2.39:1 aspect ratio 
16:9 (1920x1080 or 3840x2160), although not officially supported by the DCI specification, this aspect rat