1 / 14

MPEG Implementation Guidelines

This document outlines the DVB family of standards, focusing on the MPEG Implementation Guidelines for video and audio transmission across various channels, including terrestrial, cable, and satellite. It provides a clear framework for integrating HD and SD content, emphasizing flexibility in encoding and transmission. Key features include simulcasting capabilities, guidelines for bitrates, and chromaticity standards. The document also details audio specifications, recommending support for MPEG and Dolby AC-3 decoding, ensuring compatibility with legacy displays while paving the way for high-definition television delivery.

limei
Télécharger la présentation

MPEG Implementation Guidelines

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related