ANSI SCTE 217-2017 pdf free download – MPEG DASH Reference Architecture for IP-based Cable Services.
This MPEG DASH Reference Architecture document is to serve as informational background to a suite ofspecifications that define the usage of MPEG DASH in cable networks. It introduces adaptive bit ratestreaming as a general service and defines reference architecture in which content processing components,flows of process, use cases and scope definition of each part of other relevant documents are described.
2.Normative References
The following documents contain provisions,which, through reference in this text, constitute provisionsof the standard.At the time of Subcommittee approval, the editions indicated were valid.All standardsare subject to revision; and while parties to any agreement based on this standard are encouraged toinvestigate the possibility of applying the most recent editions of the documents listed below, they arereminded that newer editions of those documents may not be compatible with the referenced version.
None are applicable.
3. Informative References
The following documents may provide valuable information to the reader but are not required whencomplying with this standard.
3.1.SCTE References
[1]SCTE 223 2017,Adaptive Transport Stream Standard
[2]ANSISCTE 214-1,MPEG DASH for IP-Based Cable Services Part 1: MPD Constraints andExtensions
[3] ANSISCTE214-2,MPEG DASH for IP-Based Cable Services Part 2: DASH/TS Profile
[4]ANSISCTE214-3,MPEG DASH for IP-Based Cable Services Part 3: DASH ISO BMFF Profile
3.2. Standards from other Organizations
[5]ISO/IEC 23009-1:2014 2nd Ed., Information technology — Dynamic adaptive streaming over HTTP(DASH)-Part 1 : Media presentation description and segment formats.
[6] ISO/IEC 14496-12:2015, Information technology — Coding of audio-visual objects — Part 12: ISO base media file format
3.3. Published Materials
[7]R.Pantos,W.May,HTTP Live Streaming, https://tools.ietf.org/html/draft-pantos-http-live-streaming-18
6. ABR Overview
There is a variety of Adaptive Bit Rate streaming wire formats. Some are based on an MPEG-2 Transport Stream container such as HTTP Live Streaming (HLS: Apple) and others on a fragmented MP4 container such as HTTP Smooth Streaming (HSS: Microsoft) and HTTP Dynamic Streaming (HDS: Digital Plus, Adobe), whereas Dynamic Adaptive Streaming over HTTP (DASH: MPEG) supports both containers. While different, they utilize common video and audio compression formats; namely: ISO/IEC 14496-10 (AVC) and ISO/IEC 14496-3 (AAC). Additional video formats, such as ISO/IEC 23008-2 (HEVC), and audio formats, such as AC-3, may be used.
In adaptive bit rate streaming, a file or linear source asset is encoded into multiple representations, typically uniquely characterized by resolution and bitrate. For example, the video of an asset may be encoded into N different bitrates, some of which may be of common picture resolutions. Furthermore, the encoding, while continuous, is broken up into small chunks. Each video chunk starts with a Stream Access Point of type 1-3 [6], typically an IDR or closed GOP. Each new audio chunk starts at an audio access unit boundary. These access points are referred to as Chunk Boundary Points.
In some ABR formats, audio is not multiplexed with video; discrete audio streams per language are produced. In some ABR formats, auxiliary data streams such as Subtitles and/or Captions may also be delivered as discrete streams.ANSI SCTE 217 pdf download