IEEE Std 1857.7:2018 pdf download.IEEE Standard for Adaptive Streaming.
IEEE Std 1857.7 specifies the media presentation description (MPD) fbrmat and media segment format for dynamic and adaptive streaming over networks such as Hypertext Transfer Protocol (HTTP). Particularly, the speci lied formats support multi-stream synchronization, content protection, and content authentication.
1.2 Purpose
This standard specifies the MPD format and media segment format for dynamic and adaptive streaming over networks such as IITTP, with highlighted features of multi-stream synchronization, content protection, and content authentication. The target applications and services include, but are not limited to, Internet video, on-demand streaming, and live streaming.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
GB/T 20090.1, Information technology—Advanced coding of audio and video—Part 1: System.
GB/T 20090.9, Information technology—Advanced coding of audio and video—Part 9: File tbrmat.
IETF RFC 1738, Uniform Resource Locators (URL).
IETF RFC 2616, Hypertext Transfer Protocol — HTTP/l.l.
IETF RFC 3986, Uniform Resource Identifier (URI): Gcncric Syntax.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE &anclards Diciionur Onh’lIL’ should be consulted for terms not defined in this clause.4
adaptation set: Set of interchangeable encoded versions of one or several media content components.
authentication tag: Cryptographic checksum of data, to discover unexpected error or intended tampering.
bitstream switching segment: Segment that, if present, contains essential data to switch to the representation to which it is assigned.
continuous media: Media with an inherent notion of time, for example, speech, audio, video, timed text or timed metadata.
crypto period: Number of consecutive segments encrypted with the same key and initialization vector.
earliest presentation time (EPT): Smallest presentation time of any access unit of a media segment for a media stream.
encryption system: System encrypting media segments with keys provided by key system.
IITTP-URL: Uniform Resource Locator beginning with http:/I or https://.
initialization segment: Segment containing metadata that is necessary to present the media streams encapsulated in media segments.
key system: System providing keys to encrypt media segments.
media content: One media content period or a contiguous sequence of media content periods.
media presentation description (MPD): Formalized description for a media presentation for the purpose of providing a streaming service.
media presentation timeline: Concatenation of the timeline of all periods which itself is common to all representations in the period.
media presentation: Collection of data that establishes a presentation of media content.IEEE Std 1857.7 pdf download.