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: terrestrialterrestrial cablecable satellitesatellite microwavemicrowave

3 DVB Data Containers MPEG Transport Stream is used to provide DVB “data containers” which may contain a flexible mixture of: videovideo audioaudio data servicesdata services

4 Examples of DVB Data Containers Single HDTV program HDTV 1 SDTV 1 SDTV 2 SDTV 3 SDTV 4 SDTV 5 Multiple SDTV programs SDTV 1 HDTV 1 Simulcast HDTV & SDTV 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 1995First version of DVB’s “MPEG Implementation Guidelines”, ETR 154, was published in 1995 –Initial emphasis was on SDTV Revised in 1997 to include HDTVRevised 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: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 Flexibility of the generic MPEG-2 video standard is maintained to the maximum extent practical Bitstreams and IRDs are classified as SDTV or HDTV Bitstreams and IRDs are classified as SDTV or HDTV Applications are classified as contribution or distribution Applications are classified as contribution or distribution

7 Primary Classification of DVB IRDs and Bitstreams

8 MPEG Profiles and Levels Mbit/s 100 Mbit/s 80 Mbit/s 60 Mbit/s 40 Mbit/s 20 Mbit/s HIGH HIGH-1440 MAIN LOW SIMPLE MAIN SNR SCALABLE HIGH SPATIALLY SCALABLE 4:2:2 LEVELS MAX. BIT- RATE PROFILES

9 DVB Guidelines for HDTV Distribution Utilises full flexibility of MPEG full flexibility of MPEG Mandatory upper limits of:Mandatory upper limits of: –1152 lines per frame –1920 luminance samples per line –62,668,800 luminance samples per sec. Recommends use of: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 or contribution encoders produce bitstreams that comply with or HDTV contribution IRDs are capable of decoding both or bitstreams.HDTV contribution IRDs are capable of decoding both or bitstreams. Recommends use of: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: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 displaysHDTV 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 sampling32 kHz, 44.1 kHz and 48 kHz sampling All IRDs support MPEG stereo Layer I and Layer II decodingAll IRDs support MPEG stereo Layer I and Layer II decoding IRDs may also optionally support: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-3In 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 requiredIn 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 deliveryDVB standards fully support HDTV by terrestrial, cable, satellite or microwave delivery Australia will lead the way to HDTV in the DVB WorldAustralia will lead the way to HDTV in the DVB World