ANSI SCTE 243-2-2017 pdf free download.Next Generation Audio Carriage Constraints For Cable Systems: Part 2 – AC-4 Audio Carriage Constraints
1.1. Scope
This document is part of a three-part standard that specifies carriage constraints of Next Generation Audio (NGA) codecs in MPEG-2 transport systems and in MPEG DASH. In conjunction with SCTE 243-1 2017 [2], this document defines the carriage of AC-4 audio in MPEG-2 transport systems and MPEG DASH.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisions of this document. At the time of Subcommittee approval, the editions indicated were valid. All documents are subject to revision; and while parties to any agreement based on this document are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents might not be compatible with the referenced version.
2.1. SCTE References
[1] SCTE 242-2 2017, Next Generation Audio Coding Constraints for Cable Systems: Part 2 –
AC-4 Audio Coding Constraints
[2] SCTE 243-1 2017, “Next Generation Audio Carriage Constraints for Cable Systems: Part 1
– Common Transport Signaling”
2.2. Standards from Other Organizations
[3] ATSC S34-188r7, ATSC Candidate Standard: A/342 Part 2, AC-4 System
[4] ETSI TS 101 154 V2.2.1 (2015-06), Digital Video Broadcasting (DVB); Specification for
the use of Video and Audio Coding in Broadcasting Applications based on the MPEG 2
Transport Stream
[5] ETSI TS 103 190-1 V1.2.1 (2015-06), Digital Audio Compression (AC-4) Standard; Part 1:
Channel based coding
[6] ETSI TS 103 190-2 V1.1.1 (2015-08-30), Digital Audio Compression (AC-4) Standard; Part
2: Immersive and personalized audio
[7] DVB BlueBook A038 (2016-10), Digital Video Broadcasting (DVB); Specification for
Service Information (SI) in DVB systems
[8] ISO/IEC 14496-12:2015, Information technology — Coding of audio-visual objects — Part
12: ISO base media file format
3. Informative References
The following documents might provide valuable information to the reader but are not required when
complying with this document.
3.1. SCTE References
[9] ANSI/SCTE 54 2015, Digital Video Service Multiplex and Transport Subsystem Standard
for Cable Television
4. Compliance Notation
shall This word or the adjective “required” means that the item is an absolute requirement of this document. shall not This phrase means that the item is an absolute prohibition of this document. forbidden This word means the value specified shall never be used. should This word or the adjective “recommended” means that there may exist valid reasons in particular circumstances to ignore this item, but the full implications should be understood and the case carefully weighted before choosing a different course. should not This phrase means that there may exist valid reasons in particular circumstances when the listed behavior is acceptable or even useful, but the full implications should be understood and the case carefully weighed before implementing any behavior described with this label. may This word or the adjective “optional” means that this item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omit the same item. deprecated Use is permissible for legacy purposes only. Deprecated features may be removed from future versions of this document. Implementations should avoid use of deprecated features.
6. AC-4 Compressed Audio Transport
This section describes the carriage of AC-4 audio elementary streams, as defined in SCTE 242-2 2017
[1], in MPEG-2 transport systems and MPEG DASH.
6.1. Carriage in MPEG-2 Transport Streams
This section outlines the constraints and signaling for AC-4 compressed audio carried in an MPEG-2
Transport Streams.
6.1.1. Audio Elementary Stream Format
When AC-4 is multiplexed into an MPEG-2 Transport Stream, the AC-4 audio elementary stream shall be formatted using the AC-4 sync frame format as specified in ETSI TS 103 190-2 [6], Annex C.
6.1.2. PES Packaging
Placement of raw AC-4 frames of an AC-4 Elementary Stream (ES) into Packetized Elementary Stream
(PES) and thence into Transport Stream (TS) packets shall be done in accordance with ETSI TS 101 154 [4], Section 6.6.2.
