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MPEG Implementation MPEG Implementation GuidelinesGuidelines

Ken McCannKen McCann

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DVB Family of StandardsDVB Family of Standards

The DVB family of standards use a The DVB family of standards use a common baseband specification for all common baseband specification for all transmission channels:transmission channels:

• terrestrialterrestrial• cablecable• satellitesatellite• microwavemicrowave

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DVB Data ContainersDVB Data Containers

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

• videovideo• audioaudio• data servicesdata services

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Examples of DVB Data ContainersExamples 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:

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MPEG Implementation GuidelinesMPEG Implementation Guidelines

• First version of DVB’s “MPEG Implementation First version of DVB’s “MPEG Implementation Guidelines”, ETR 154, was published in 1995Guidelines”, ETR 154, was published in 1995

– Initial emphasis was on SDTVInitial emphasis was on SDTV

• Revised in 1997 to include HDTV Revised in 1997 to include HDTV – SDTV and HDTV versions of a program may be simulcastSDTV and HDTV versions of a program may be simulcast

• 1999 revision is due to be published shortly and 1999 revision is due to be published shortly and includes options for:includes options for:

– Active Format Description Active Format Description – MPEG Audio MetadataMPEG Audio Metadata– Dolby AC-3 audioDolby AC-3 audio

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Main Features of VideoMain Features of Video

Flexibility of the generic MPEG-2 video Flexibility of the generic MPEG-2 video standard is maintained to the maximum standard is maintained to the maximum extent practicalextent practical

Bitstreams and IRDs are classified asBitstreams and IRDs are classified as SDTVSDTV or or HDTVHDTV

Applications are classified as Applications are classified as contributioncontribution or or distributiondistribution

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Primary Classification of DVB IRDs Primary Classification of DVB IRDs and Bitstreamsand Bitstreams

Bitstream

IRD SD

TV

Dis

trib

utio

n

SD

TV

Contr

ibu

tion

HD

TV

Dis

trib

utio

n

HD

TV

Contr

ibu

tion

SDTV Distribution SDTV Contribution HDTV Distribution HDTV Contribution

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MPEG Profiles and LevelsMPEG Profiles and Levels 422P@HL

HP@HL

HP@H14L

SSP@H14L

MP@H14L

MP@HL

HP@ML

SNRP@ML

SNRP@LLMP@LL

SP@MLMP@ML

422P@ML

300 Mbit/s

100 Mbit/s80 Mbit/s

60 Mbit/s

40 Mbit/s

20 Mbit/s

HIGH

HIGH-1440

MAIN

LOW

SIMPLEMAIN

SNRSCALABLE

HIGHSPATIALLYSCALABLE

4:2:2LEVELS

MAX.BIT-RATE

PROFILES

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DVB Guidelines for HDTV DistributionDVB Guidelines for HDTV Distribution

• Utilises full flexibility of MPEG MP@HL Utilises full flexibility of MPEG MP@HL • Mandatory upper limits of:Mandatory upper limits of:

– 1152 lines per frame1152 lines per frame– 1920 luminance samples per line1920 luminance samples per line– 62,668,800 luminance samples per sec.62,668,800 luminance samples per sec.

• Recommends use of:Recommends use of:– 1080 active lines per frame1080 active lines per frame– 1920 luminance samples per line1920 luminance samples per line

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DVB Guidelines for HDTV ContributionDVB Guidelines for HDTV Contribution

• HDTV contribution encoders produce HDTV contribution encoders produce bitstreams that comply with 422P@HL or bitstreams that comply with 422P@HL or MP@HL MP@HL

• HDTV contribution IRDs are capable of HDTV contribution IRDs are capable of decoding both 422P@HL or MP@HL bitstreams.decoding both 422P@HL or MP@HL bitstreams.

• Recommends use of:Recommends use of:– 1080 active lines per frame1080 active lines per frame– 1920 luminance samples per line1920 luminance samples per line

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ChromaticityChromaticity

• SDTV needs compatibility with legacy displays, so SDTV needs compatibility with legacy displays, so default SDTV chromaticity in DVB is:default SDTV chromaticity in DVB is:

– same as PAL for 25Hzsame as PAL for 25Hz– same as NTSC for 30Hzsame as NTSC for 30Hz

• HDTV has unified world-wide chromaticity and no HDTV has unified world-wide chromaticity and no legacy displayslegacy displays

– default is BT.709 for both 25Hz and 30Hzdefault is BT.709 for both 25Hz and 30Hz– simulcast allows mixture of legacy chromaticity simulcast allows mixture of legacy chromaticity

for SDTV and BT.709 for HDTVfor SDTV and BT.709 for HDTV

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Main Audio Features of DVB IRDsMain 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 All IRDs support MPEG stereo Layer I and

Layer II decodingLayer II decoding• IRDs may also optionally support:IRDs may also optionally support:

– MPEG-2 backwards compatible multi-MPEG-2 backwards compatible multi-channel decodingchannel decoding

– Dolby AC-3 decodingDolby AC-3 decoding

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Main Audio Features of DVB BitstreamsMain Audio Features of DVB Bitstreams

• In general, audio content is encoded In general, audio content is encoded using MPEG stereo Layer II, even if it using MPEG stereo Layer II, even if it is also encoded using Dolby AC-3is also encoded using Dolby AC-3

• In specific situations where all IRDs In specific situations where all IRDs are required to support Dolby AC-3 are required to support Dolby AC-3 then simulcast of MPEG stereo is not then simulcast of MPEG stereo is not requiredrequired

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ConclusionsConclusions

• DVB standards fully support HDTV by DVB standards fully support HDTV by terrestrial, cable, satellite or microwave terrestrial, cable, satellite or microwave deliverydelivery

• Australia will lead the way to HDTV in Australia will lead the way to HDTV in the DVB Worldthe DVB World