ANSI SCTE 215-2 pdf free download

ANSI SCTE 215-2 pdf free download.HEVC Video Constraints for Cable Television Part 2- Transport.
6.4 HEVC Program Constraints MPEG-2 Programs shall be constrained to carry at most one HEVC video elementary stream component with a stream_ _type value of 0x24; as defined in ISO/IEC 13818-1:2013 with FDAM 3 [7]. 6.4.1 SCTE HEVC Random Access Point (SHRAP) Access Unit Composition An SCTE HEVC Random Access Point access unit (SHRAP) demarcates a location within an HEVC bitstream where an HEVC Receiver is able to begin decoding video. The spacing of successive random access points is an important contributor to channel change time, but is not the only factor contributing to channel change time. Other factors that contribute to channel change time include physical device tuning constraints, RF tuning, or conditional access operations. Picture coding constraints for low delay mode are found in SCTE HEVC Coding Constraints [2]. 6.4.2 SHRAP Transport Constraints An SHRAP shall meet the following transport constraints. 6.4.2.1 TS Packet Header and Adaptation Field Constraints A TS packet containing the first byte of a PES packet header of an SHRAP shall have an adaptation field. The payload_ _unit_ start_ indicator bit shall be set to ‘1’ in the TS packet header and the adaptation_ field_ control bits shall be set to ’11′(as per ISO/IEC 13818-1 [7]).
The time difference between the receipt of an SHRAP (actual value of PCR if present in the transport packet or computed value of PCR for the transport packet containing SHRAP) and the DTS/PTS of its SHRAP Picture is another key component in determining channel change time. The time difference between the receipt of an SHRAP and the DTS of its SHRAP Picture is also known as the initial video buffering delay of the HEVC Bitstream in the CPB. The initial video buffering delay shall not be greater than 3 seconds. For applications requiring fast channel change or small initial delay after random access, the initial video buffering delay should be limited to one second or less. NOTE 9: The maximum initial video buffering delay for a given bitrate is not permitted to have a value that exceeds the maximumn CPB size permissible in HEVC [8]. 6.4.2.3 Constraints on Decoding Time Stamps The maximum time interval between the decoding time stamp of successive SHRAP Pictures shall be less than or equal to 3 seconds. For applications where fast channel change or random access is important, the maximum time interval between the decoding time stamp of successive SHRAP Pictures should be less than or equal to 1.2 seconds. NOTE 10: The frequency at which SHRAP access units are inserted into an HEVC Bitstream is one of the key components in determining the channel change time and may simplify, splicing and trick mode operations. If the interval between the Decoding Time Stamps of ^two successive SHRAP Pictures is too small, compression efficiency might be lowered significantly. On the other hand, if the interval between the Decoding Time Stamps of two successive SHRAP Pictures is too large, the time to effect a channel change or the initial delay after random access may be longer. 6.4.3 Adaptation Field Private Data The signaling of adaptation field private data is described in SCTE 128-2 [4] section 6.4.3. Tag Values for HEVC shall be as described in the Table 3.
ANSI SCTE 215-2 pdf download.