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MPEG Implementation Guidelines

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					    MPEG Implementation
        Guidelines
          Ken McCann




1
    DVB Family of Standards

    The DVB family of standards use a
    common baseband specification for all
    transmission channels:
       • terrestrial
       • cable
       • satellite
       • microwave


2
    DVB Data Containers

    MPEG Transport Stream is used to provide
    DVB “data containers” which may contain
    a flexible mixture of:
       • video
       • audio
       • data services




3
    Examples of DVB Data Containers

    Channel bandwidth can be used in different ways:

       SDTV 1
       SDTV 2
       SDTV 3           HDTV 1           HDTV 1
       SDTV 4
       SDTV 5                            SDTV 1
        Multiple         Single         Simulcast
         SDTV            HDTV            HDTV &
       programs         program           SDTV

4
     MPEG Implementation Guidelines
• First version of DVB’s “MPEG Implementation
  Guidelines”, ETR 154, was published in 1995
      – Initial emphasis was on SDTV
• Revised in 1997 to include HDTV
      – SDTV and HDTV versions of a program may be
        simulcast
• 1999 revision is due to be published shortly
  and includes options for:
      – Active Format Description
      – MPEG Audio Metadata
      – Dolby AC-3 audio
 5
        Main Features of Video


       Flexibility of the generic MPEG-2 video
        standard is maintained to the maximum
        extent practical
       Bitstreams and IRDs are classified as SDTV
        or HDTV
       Applications are classified as contribution or
        distribution


    6
    Primary Classification of DVB IRDs
    and Bitstreams
                                        Bitstream




                                        Contribution




                                                                      Contribution
                         Distribution




                                                       Distribution
                                                         HDTV


                                                                        HDTV
                           SDTV


                                          SDTV
     IRD

     SDTV Distribution    
     SDTV Contribution                  
     HDTV Distribution                                 
     HDTV Contribution                                              
7
   MPEG Profiles and Levels
                                                                                422P@HL
 MAX.
 BIT-
 RATE
 300 Mbit/s




                                                                      HP@HL




 100 Mbit/s                      MP@HL                                        HP@H14L
  80 Mbit/s
  60 Mbit/s                                                    SSP@H14L
  40 Mbit/s
                                         MP@H14L                                                  422P@ML
  20 Mbit/s
                                                                                        HP@ML
     HIGH
                                                              SNRP@ML
                                                   MP@ML
              HIGH-1440
                                       SP@ML
                                                                                                              4:2:2
                                                                      SNRP@LL
LEVELS                    MAIN
                                                           MP@LL                          SPATIALLY
                                                                                                      HIGH
     8                                                                    SNR             SCALABLE
                                 LOW
                                                                   MAIN   SCALABLE                       PROFILES
                                                     SIMPLE
    DVB Guidelines for HDTV Distribution

    • Utilises full flexibility of MPEG MP@HL
    • Mandatory upper limits of:
       – 1152 lines per frame
       – 1920 luminance samples per line
       – 62,668,800 luminance samples per sec.
    • Recommends use of:
       – 1080 active lines per frame
       – 1920 luminance samples per line

9
 DVB Guidelines for HDTV Contribution

• HDTV contribution encoders produce
  bitstreams that comply with 422P@HL or
  MP@HL
• HDTV contribution IRDs are capable of
  decoding both 422P@HL or MP@HL bitstreams.
• Recommends use of:
   – 1080 active lines per frame
   – 1920 luminance samples per line

10
   Chromaticity

• SDTV needs compatibility with legacy displays, so
  default SDTV chromaticity in DVB is:
    – same as PAL for 25Hz
    – same as NTSC for 30Hz
• HDTV has unified world-wide chromaticity and no
  legacy displays
    – default is BT.709 for both 25Hz and 30Hz
    – simulcast allows mixture of legacy chromaticity
      for SDTV and BT.709 for HDTV
  11
 Main Audio Features of DVB IRDs

     • 32 kHz, 44.1 kHz and 48 kHz sampling
     • All IRDs support MPEG stereo Layer I and
       Layer II decoding
     • IRDs may also optionally support:
         – MPEG-2 backwards compatible multi-
           channel decoding
         – Dolby AC-3 decoding


12
 Main Audio Features of DVB Bitstreams

     • In general, audio content is encoded
       using MPEG stereo Layer II, even if it
       is also encoded using Dolby AC-3
     • In specific situations where all IRDs
       are required to support Dolby AC-3
       then simulcast of MPEG stereo is not
       required



13
 Conclusions

     • DVB standards fully support HDTV by
       terrestrial, cable, satellite or microwave
       delivery
     • Australia will lead the way to HDTV in
       the DVB World




14

				
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