ANSI SCTE-35-2011 pdf download Digital Program Insertion Cueing Message for Cable
4 Abbreviations
This document uses the following abbreviations:
ADI: Asset Distribution Interface
Ad-ID: Advertisement Identifier
ATSC: Advanced Television Systems Committee.
bslbf: Bit string, left bit first, where left is the order in which bit strings are written.
DVB: Digital Video Broadcast
FIPS: Federal Information Processing Standard
ISAN: International Standard Audiovisual Number (see ISO 15706)
ISCI: Industry Standard Commercial Identifier
MPTS: a Multi Program Transport Stream.
PMT: Program Map Table (see ITU-T H.222.0 / ISO/IEC 13818-1).
PTS: Presentation Time Stamp (see ITU-T H.222.0 / ISO/IEC 13818-1).
rpchof: Remainder polynomial coefficients, highest order first.
SPTS: a Single Program Transport Stream.
STC: System Time Clock
TI: Turner Identifier
TID: Tribune Identifier
uimsbf: Unsigned integer, most significant bit first.
UMID: Unique Material Identifier
V-ISAN: Version-ISAN (core ISAN number plus a version number) (see ISO 15706-2)
5 Introduction
5.1 Splice points (Informative)
To enable the splicing of compressed bit streams, this standard defines Splice Points. Splice Points in an MPEG-2 transport stream provide opportunities to switch elementary streams from one source to another. They indicate a place to switch or a place in the bit stream where a switch can be made. Splicing at such splice points may or may not result in good visual and audio quality. That is determined by the performance of the splicing device.
Transport streams are created by multiplexing PID streams. In this standard, two types of Splice Points for PID streams are defined: Out Points and In Points. In Points are places in the bit streams where it is acceptable to enter, from a splicing standpoint. Out Points are places where it is acceptable to exit the bit stream. The grouping of In Points of individual PID streams into Program In Points in order to enable the switching of entire programs (video with audio) is defined. Program Out Points for exiting a program are also defined.
Out Points and In Points are imaginary points in the bit stream located between two elementary stream presentation units. Out Points and In Points are not necessarily transport packet aligned and are not necessarily PES packet aligned. An Out Point and an In Point may be co-located; that is, a single presentation unit boundary may serve as both a safe place to leave a bit stream and a safe place to enter it.