1、 1 Scope ISO/IEC 13818-2, commonly known as MPEG-2 video, includes specification of the MPEG-2 4:2:2 profile. Based on ISO/IEC 13818-2, this standard provides additional specification for the MPEG-2 4:2:2 profile at high level. It is intended for use in high-definition television production, contrib
2、ution, and distribution applications. As in ISO/IEC 13818-2, this standard defines bit streams, including their syntax and semantics, together with the requirements for a compliant decoder for 4:2:2 profile at high level, but does not specify particular encoder operating parameters. 2 Normative refe
3、rence The following standard contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to inves
4、tigate the possibility of applying the most recent edition of the standard indicated below. ISO/IEC 13818-2:2000, Information Technology Generic Coding of Moving Pictures and Associated Audio Information: Video 3 4:2:2 high profile The MPEG-2 4:2:2 profile at main level is defined in ISO/IEC 13818-2
5、. Only those additional parameters necessary to define the 4:2:2 profile at high level are specified in this standard. 3.1 Profile_and_level indication The 4:2:2 high profile does not have a hierarchical relationship to other profiles. The profile_and_level_identification shall be 10000010 (see ISO/
6、IEC 13818-2, table 8-4). 3.2 Syntactic constraints Syntactic constraints for the 4:2:2 profile are specified in ISO/IEC 13818-2. No new constraints are specified for the 4:2:2 profile at high level (see ISO/IEC 13818-2, table 8-5). 3.3 Parameter constraints The parameter constraints for the 4:2:2 pr
7、ofile at high level are the same as those for the main profile at the main level, except as follows: Page 1 of 3 pages SMPTE 308M-2004 Revision of SMPTE 308M-1998 Copyright 2004 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 App
8、roved October 8, 2004 SMPTE STANDARD for Television MPEG-2 4:2:2 Profile at High Level SMPTE 308M-2004 Page 2 of 3 pages Upper bounds for sampling density: 1920 samples/line 1088 lines/frame 60 frames/s Upper bounds for luminance sample rate: 62,668,800 samples/s Upper bounds for bit rates: 300 Mbit
9、s/s Additional constraints on bit rates: At bit rates of 175 to 230 Mbits/s, no two consecutive frames shall be coded as nonintracoded pictures. NOTE The constraint that no two consecutive frames shall be coded as nonintracoded pictures describes a bit-stream which a compliant decoder is required to
10、 properly decode. It is understood that bit-stream splicing might result in consecutive nonintracoded pictures, but that operation of the decoder is not ensured in such a case. At bit rates of 230 to 300 Mbits/s, only intracoded pictures shall be used for interlaced scan images and no two consecutiv
11、e frames shall be coded as nonintracoded pictures for progressive scan images (see note). VBV buffer size: 47,185,920 bits. (See ISO/IEC 13818-2, tables 8-11, 8-12, 8-13, and 8-14.) Annex A (informative) Bit rates and GOP structures A.1 Considerations Combinations of bit rates and GOP structures all
12、owed in this standard are based on the following considerations: 1) Higher bit rates are more expensive than lower bit rates to implement in codecs. 2) Longer GOP structures, such as IBBP, are more expensive than shorter GOP structures, such as I or IP, to implement in codecs. 3) Compliant decoders
13、are required to implement the ranges of data rates and GOP structures specified in the standard. 4) The particular combination of maximum data rate and long GOP structures does not provide a practically necessary operating point. 5) Editing granularity of I-only coded interlaced scan is the same as
14、IP coded progressive scan. A.2 Combinations The following combinations of bit rates and GOP structures are therefore allowed: Bit rate GOP (scan) 230 to 300 Mbits/s I-only (interlaced scan) I-only or IP or IB (progressive scan) 175 to 230 Mbits/s I-only, IP, or IB Up to 175 Mbits/s Any allowed GOP S
15、ee figure A.1. SMPTE 308M-2004 Page 3 of 3 pages Bit RateGOPI-Only * IP or IB Long300 Mbits/s230 Mbits/s175 Mbits/s* IP or IB Progressive ScanFigure A.1 Bit rates and GOP structures Annex B (informative) Bibliography ANSI/SMPTE 295M-1997, Television 1920 x 1080 50-Hz Scanning and Interface SMPTE 240
16、M-1999, Television 1125-Line High-Definition Production Systems Signal Parameters SMPTE 274M-2003, Television 1920 x 1080 Image Sample Structure, Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates SMPTE 296M-2001, Television 1280 x 720 Progressive Image Sample Structure Analog and Digital Representation and Analog Interface
