Network Working Group T. Edwards
Request for Comments: 4539 PBS
Category: Informational May 2006
Network Working Group T. Edwards
Request for Comments: 4539 PBS
Category: Informational May 2006
Media Type Registration for the Society of Motion Picture and Television Engineers (SMPTE) Material Exchange Format (MXF)
电影电视工程师协会（SMPTE）材料交换格式（MXF）的媒体类型注册
Status of This Memo
关于下段备忘
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
本备忘录为互联网社区提供信息。它没有规定任何类型的互联网标准。本备忘录的分发不受限制。
Copyright Notice
版权公告
Copyright (C) The Internet Society (2006).
版权所有（C）互联网协会（2006年）。
Abstract
摘要
This document serves to register a media type for the Society of Motion Picture and Television Engineers (SMPTE) Material Exchange Format (MXF). MXF, defined by SMPTE 377M, is a standard wrapper format developed for the interchange of audiovisual material, including both audiovisual essence and rich metadata.
This document serves to register a media type for the Society of Motion Picture and Television Engineers (SMPTE) Material Exchange Format (MXF). MXF, defined by SMPTE 377M, is a standard wrapper format developed for the interchange of audiovisual material, including both audiovisual essence and rich metadata.translate error, please retry
Table of Contents
目录
1. Introduction ....................................................2
2. Security Considerations .........................................3
3. IANA Considerations .............................................3
3.1. Media Type for SMPTE Material Exchange Format (MXF) ........3
4. References ......................................................5
4.1. Normative References .......................................5
4.2. Informative References .....................................5
1. Introduction ....................................................2
2. Security Considerations .........................................3
3. IANA Considerations .............................................3
3.1. Media Type for SMPTE Material Exchange Format (MXF) ........3
4. References ......................................................5
4.1. Normative References .......................................5
4.2. Informative References .....................................5
The present document registers a media type for SMPTE Material Exchange Format (MXF). MXF, defined by SMPTE 377M [SMPTE377M], is a standard wrapper format developed for the interchange of audiovisual material, including both audiovisual essence and rich metadata.
本文件登记了SMPTE材料交换格式（MXF）的介质类型。MXF由SMPTE 377M[SMPTE 377M]定义，是一种标准包装格式，用于交换视听材料，包括视听精华和丰富的元数据。
Essence is the raw video, audio, and data streams contained and described by MXF. Metadata carried by MXF includes structural metadata and descriptive metadata. Structural metadata relates to the structure and capabilities of the MXF file and is generally required for proper decoding. Some examples of structural metadata are descriptions of essence types, information to help synchronize playout of audio and video, and content length. Descriptive metadata gives information about the program content in the file and is not essential for decoding. Some examples of descriptive metadata are program title, actors, and scene descriptions. The essence in MXF files may itself carry data, such as vertical blanking interval data used for carriage of Closed Captioning and other purposes.
本质是MXF包含和描述的原始视频、音频和数据流。MXF携带的元数据包括结构元数据和描述性元数据。结构元数据与MXF文件的结构和功能有关，通常是正确解码所必需的。结构元数据的一些示例包括基本类型的描述、帮助同步音频和视频播放的信息以及内容长度。描述性元数据提供了有关文件中程序内容的信息，对于解码不是必需的。描述性元数据的一些示例包括节目标题、演员和场景描述。MXF文件中的精华本身可能携带数据，例如用于传送闭路字幕和其他目的的垂直消隐间隔数据。
MXF is an important tool in providing interoperation between different video systems as well as digital cinema systems. MXF also aids in the development of video production and distribution workflows that are more efficient, multi-vendor, file based, and IT oriented.
MXF是提供不同视频系统以及数字电影系统之间互操作的重要工具。MXF还帮助开发更高效、多供应商、基于文件和面向IT的视频制作和分发工作流。
SMPTE currently has standards for the mapping of the following essence types to the MXF generic container: MPEG (including MPEG-1 and MPEG-2 video streams, as well as MPEG audio), DV-DIF (Digital Video Digital Interface Format for the DV family of related video encodings), Uncompressed Pictures, SDTI-CP (Serial Digital Transport Interface Content Package for delivering packetized audiovisual content over the SDI interface), D-10 (a specialized video stream incorporating MPEG-2 4:2:2P@ML), D-11 (a high-definition video compression standard), AES3 audio, Broadcast Wave audio, and A-Law audio. The flexibility of the MXF generic container allows for the possibility of mappings of additional essence types in the future.
SMPTE目前有将以下基本类型映射到MXF通用容器的标准：MPEG（包括MPEG-1和MPEG-2视频流以及MPEG音频）、DV-DIF（用于DV相关视频编码系列的数字视频数字接口格式）、未压缩图片、SDTI-CP（串行数字传输接口内容包，用于通过SDI接口传送打包的视听内容），D-10（包含MPEG-2 4:2的专用视频流：2P@ML)，D-11（高清视频压缩标准）、AES3音频、广播波音频和A-Law音频。MXF通用容器的灵活性允许将来映射其他基本类型。
The media type defined here is needed to correctly identify MXF files when they are served over HTTP or other network connections, included in multi-part documents, indexed by operating systems and digital asset management systems, or used in other places where media types are used.
当通过HTTP或其他网络连接提供MXF文件、包含在多部分文档中、由操作系统和数字资产管理系统编制索引或在使用媒体类型的其他地方使用时，需要此处定义的媒体类型来正确识别MXF文件。
Security requirements for the application/mxf media type are discussed in the IANA media type registration (Section 3.1).
IANA介质类型注册（第3.1节）中讨论了应用程序/mxf介质类型的安全要求。
The IANA has registered the media type application/mxf as specified in Section 3.1. The registration uses the template present in [RFC4288].
IANA已按照第3.1节的规定注册了媒体类型应用程序/mxf。注册使用[RFC4288]中的模板。
To: ietf-types@iana.org
Subject: Registration of media type application/mxf
To: ietf-types@iana.org
Subject: Registration of media type application/mxf
Type name: application
类型名称：应用程序
Subtype name: mxf
子类型名称：mxf
Required parameters: none
所需参数：无
Optional parameters: ULs
可选参数：ULs
The optional parameter ULs is a single Uniform Resource Name (URN), or a comma-separated list of multiple URNs of SMPTE Universal Labels (which are defined by SMPTE 400M [SMPTE400M]).
可选参数ULs是单个统一资源名称（URN），或SMPTE通用标签（由SMPTE 400M[SMPTE400M]定义）的多个URN的逗号分隔列表。
This optional parameter provides hints to the decoder regarding the structure of the MXF file, which could include Operational Pattern, essence types, descriptive metadata schemes, and other elements that are identified by their SMPTE Universal Label.
此可选参数向解码器提供有关MXF文件结构的提示，其中可能包括操作模式、基本类型、描述性元数据方案以及由SMPTE通用标签标识的其他元素。
SMPTE Universal Labels are Object Identifiers (OIDs), as specified by [ASN1]. Thus, a URN of a SMPTE Universal Label can use the OID URN namespace specified in [RFC3061], or any other future URN namespace that is appropriate for SMPTE Universal Labels.
SMPTE通用标签是由[ASN1]指定的对象标识符（OID）。因此，SMPTE通用标签的URN可以使用[RFC3061]中指定的OID URN命名空间，或者任何其他适合SMPTE通用标签的未来URN命名空间。
Note that, per [RFC2045], some characters (including the comma used to separate multiple values) require that the entire parameter value be enclosed in quotes.
请注意，根据[RFC2045]，某些字符（包括用于分隔多个值的逗号）要求将整个参数值括在引号中。
Below is an example of use of the optional parameter. The two SMPTE Universal Labels indicate that the MXF file uses the OP1a Operational Pattern and contains IEC DV video at 25 Mbps, 525 lines, 59.94 fps interlaced essence.
下面是使用可选参数的示例。两个SMPTE通用标签表明MXF文件使用OP1a操作模式，包含25 Mbps、525行、59.94 fps隔行扫描的IEC DV视频。
Content-Type: application/mxf;
ULs="urn:oid:1.3.52.4.1.1.1.13.1.2.1.1.1,
urn:oid:1.3.52.4.1.1.1.4.1.2.2.2.1.1"
Content-Type: application/mxf;
ULs="urn:oid:1.3.52.4.1.1.1.13.1.2.1.1.1,
urn:oid:1.3.52.4.1.1.1.4.1.2.2.2.1.1"
Encoding considerations: binary
编码注意事项：二进制
Security considerations: Application/mxf objects are not signed but may be partially encrypted internally. External security mechanisms must be employed to ensure content confidentiality. MXF, through metadata extensions, may allow executable code to be transferred in the file. It is suggested that no unauthenticated executables decoded from an MXF file be executed. Some compressed essence types carried in MXF may carry a risk that certain pathological bitstreams could lead to potential denial-of-service attacks against these essence decoders.
安全注意事项：应用程序/mxf对象未签名，但可能会在内部进行部分加密。必须使用外部安全机制来确保内容的机密性。通过元数据扩展，MXF可以允许在文件中传输可执行代码。建议不执行从MXF文件解码的未经验证的可执行文件。MXF中携带的某些压缩的Essential类型可能存在某些病态比特流可能导致针对这些Essential解码器的潜在拒绝服务攻击的风险。
Interoperability considerations: MXF provides a standard wrapping for a number of audio and video essence types according to a number of different Operational Patterns (OP). Thus, interoperability depends upon whether the MXF file decoder has the capability to match the features of the MXF file encoder. An Application Specification (AS) can ensure that MXF encoders and decoders can interoperate effectively.
互操作性注意事项：MXF根据多种不同的操作模式（OP）为多种音频和视频基本类型提供标准包装。因此，互操作性取决于MXF文件解码器是否能够匹配MXF文件编码器的功能。应用程序规范（AS）可以确保MXF编码器和解码器能够有效地互操作。
Published specification: RFC 4539, SMPTE 377M [SMPTE377M]
已发布规范：RFC 4539，SMPTE 377M[SMPTE 377M]
Applications that use this media type: MXF is a wrapper for many types of audio and video essence types in use by many applications in the broadcast and digital cinema industries. These include non-linear editing systems, video servers, video camera systems, digital asset management systems, and digital video distribution systems.
使用此媒体类型的应用程序：MXF是广播和数字电影行业中许多应用程序使用的多种音频和视频基本类型的包装器。这些包括非线性编辑系统、视频服务器、摄像机系统、数字资产管理系统和数字视频分发系统。
Additional information:
其他信息：
Magic number(s): none
幻数：无
File extension(s): .mxf
文件扩展名：.mxf
Macintosh File Type Code(s): "mxf "
Macintosh文件类型代码：“mxf”
Person & email address to contact for further information: Thomas Edwards email: tedwards@pbs.org
联系人和电子邮件地址以获取更多信息：Thomas Edwards电子邮件：tedwards@pbs.org
Intended usage: COMMON
预期用途：普通
Restrictions on usage: none
使用限制：无
Author/Change controller:
作者/变更控制员：
Thomas Edwards email: tedwards@pbs.org
托马斯·爱德华兹电子邮件：tedwards@pbs.org
[SMPTE377M] Society of Motion Picture and Television Engineers, "Material Exchange Format (MXF) File Format Specification", SMPTE 377M-2004, <http://www.smpte.org>.
[SMPTE377M]电影和电视工程师学会，“材料交换格式（MXF）文件格式规范”，SMPTE377M-2004<http://www.smpte.org>.
[SMPTE400M] Society of Motion Picture and Television Engineers, "SMPTE Labels Structure", SMPTE 400M-2004, <http://www.smpte.org>.
[SMPTE400M]电影和电视工程师学会，“SMPTE标签结构”，SMPTE 400M-2004<http://www.smpte.org>.
[ASN1] International Telephone and Telegraph Consultative Committee, "Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1)", CCITT Recommendation X.209, January 1988.
[ASN1]国际电话电报咨询委员会，“抽象语法符号1（ASN.1）基本编码规则规范”，CCITT建议X.209，1988年1月。
[RFC2045] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996.
[RFC2045]Freed，N.和N.Borenstein，“多用途Internet邮件扩展（MIME）第一部分：Internet邮件正文格式”，RFC 20451996年11月。
[RFC3061] Mealling, M., "A URN Namespace of Object Identifiers", RFC 3061, February 2001.
[RFC3061]Mealling，M.，“对象标识符的URN名称空间”，RFC 3061，2001年2月。
[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and Registration Procedures", BCP 13, RFC 4288, December 2005.
[RFC4288]Freed，N.和J.Klensin，“介质类型规范和注册程序”，BCP 13，RFC 4288，2005年12月。
Author's Address
作者地址
Thomas G. Edwards PBS 6453 Stephenson Way Alexandria, VA 22312 US
美国弗吉尼亚州亚历山大市斯蒂芬森路6453号托马斯·G·爱德华兹公共广播公司，邮编22312
Phone: +1 703 739 5000
EMail: tedwards@pbs.org
URI: http://www.pbs.org
Phone: +1 703 739 5000
EMail: tedwards@pbs.org
URI: http://www.pbs.org
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版权所有（C）互联网协会（2006年）。
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