ANSI SCTE 172 pdf free download

ANSI SCTE 172 pdf free download.Constraints On AVC and HEVC Structured Video Coding for Digital Program Insertion.
6. Digital Program Insertion System Overview (Informative)
Digital Program Insertion assumes a linear program delivery with periodic insertion opportunities signaled by ANSI/SCTE 35 [l]splice_info_section( ) messages carried in TS packets of a particular PID or PIDs within the program’s TS. Insertion opportunities signal first a splice from network PTS value (usually to an advertisement) and optionally followed some time later by the signaling of a splice back into a different (usually later) network PTS value. An alternative signaling method signals only the first PTS but supplies a duration and signals “auto return to network.” Signaling may also, in the case of content which may be delivered in a non-time-linear method (e.g. VoD), specify that the return to network PTS value be the same as the initial PTS value.
Insertion durations are seconds in length normally, although they are sometimes hours in length. For typical commercials durations run 30, 60, or 120 seconds.
Different delivery mechanisms may use different technologies to perform the insertions. For example, insertions in linear program delivery are typically done by a splicer/content server pair. In a VOD environment a VOD server may asscrnple a playlist of entertainment content and the inserted ads. For DASH delivery ad content segments may be inserted into or replaced in the manifest. The coding constraints defined in the specification are applicable to all delivery mechanisms. The transport constraints are applicable to delivery mechanisms that are based on MPEG transport [6]
6.1. Collective Terminology for NAL Based Video Streams (Informative)
Text in this specification related to NAL based video streams use the following structures and syntax to support use of common collective terminology across codecs for describing spliced based expectations and constraints in this specification. The “context” when referring to NAL based terminology is determined by expectations of which coding format (e.g. AVC or HEVC) is being used. There is no intention of mixing of different coding format NAL structures so collective terminology is not to be interpreted as such. If there are splicing conditions that are specific to particular codec formats then this will be explicitly documented in the specification without the use of collective NAL terminology.
When NAL ISO/IEC Video Coding Standard is used this eithers refers to ISO/IEC 14496-10 (ITU-T H.264), International Standard, Advanced video coding for generic audiovisual services [7] or ISO/IEC 23008-2 (ITU-T Rec. H.265), International Standard (2015)— MPEG H Information technology — High efficiency coding and media delivery in heterogeneous environments Part 2: High efficiency video coding [9].
The following list is the set of NAL collective terminologies used in this specification. The specific codec context needs to be selected to understand details relevant to that specific format.
• NAL Video Coding Standard
14496-10 context: AVC ISO/IEC 14496-10 Coding Specification [7].
23008-2 context: HEVC ISO/IEC 23008-2 Coding Specification [9].
• NAL SCTE In-Point
14496-10 context: refers to an IDR picture that meets the requirements of an SRAP as defined in Section 6.4.1 of ANSI/SCTE 128-1 2013 [2].23008-2 context: refers to an IDR, BLA, or CRA picture or a TRAIL_R field picture that meets the requirements of an SHRAP as defined in Section 7.1.2.1 of ANSI/SCTE 2 15-1 2015 [4]. BLA or CRA pictures can have associated RADL pictures but no associated RASL pictures.ANSI SCTE 172 pdf download.