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MPEG Implementation Guidelines

MPEG Implementation Guidelines. Ken McCann. DVB Family of Standards. The DVB family of standards use a common baseband specification for all transmission channels: terrestrial cable satellite microwave. DVB Data Containers.

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MPEG Implementation Guidelines

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  1. MPEG Implementation Guidelines Ken McCann

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

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

  4. SDTV 1 HDTV 1 SDTV 2 HDTV 1 SDTV 3 SDTV 4 SDTV 5 SDTV 1 Multiple SDTV programs Single HDTV program Simulcast HDTV & SDTV Examples of DVB Data Containers Channel bandwidth can be used in different ways:

  5. 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

  6. Main Features of Video • Flexibility of the generic MPEG-2 video standard is maintained to the maximum extent practical • Bitstreams and IRDs are classified asSDTVor HDTV • Applications are classified as contribution ordistribution

  7. Primary Classification of DVB IRDs and Bitstreams

  8. 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 LEVELS SNRP@LL MAIN HIGH MP@LL SPATIALLY SCALABLE SNR SCALABLE LOW PROFILES MAIN SIMPLE

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

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

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