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MPEG-2 Systems Overview (13818-1) • Packet Concepts • MPEG-2 Program Streams • MPEG-2 Transport Streams • Timing Mechanisms • A/V Synchronization • Transport System Target Decoder (T-STD) • MPEG Bitstream Syntax and Table Structure • Program Specific Information • DVB and ATSC Transport Formats
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1
© 1995-99
Sarnoff Corporation
MPEG-2 Systems
Reproduction in any form requires written permission from the Sarnoff Corporation.
August 25, 1999
Michael Isnardi
Sarnoff Corporation
e-mail: misnardi@sarnoff.com
2
© 1995-99
Sarnoff Corporation
Outline
• MPEG-2 Systems Overview (13818-1)
• Packet Concepts
• MPEG-2 Program Streams
• MPEG-2 Transport Streams
• Timing Mechanisms
• A/V Synchronization
• Transport System Target Decoder (T-STD)
• MPEG Bitstream Syntax and Table Structure
• Program Specific Information
• DVB and ATSC Transport Formats
3
© 1995-99
Sarnoff Corporation
What is MPEG-2 Systems?
• It’s a communications layer that encapsulates
compressed video, audio and data streams in packets.
• Multiplexes elements of a single program: video, audio,
program-related data, etc.
• Multiplexes multiple programs
• Synchronizes all elements of a program
• Provides flexibility by allowing dynamic mix of content
• Provides extensibility by allowing new services to be
added without losing existing audience share.
4
© 1995-99
Sarnoff Corporation
MPEG-2 Systems
MPEG-2
Video
Encoder
MPEG-2
Video
Encoder
MPEG/AC-3
Audio
Encoder
MPEG/AC-3
Audio
Encoder
Video
Audio
Data
Mux
De
Mux
MPEG-2
Video
Decoder
MPEG-2
Video
Decoder
MPEG/AC-3
Audio
Decoder
MPEG/AC-3
Audio
Decoder
Video
Audio
Data
Digital
Channel
Encoder Decoder
Timing &
Control
Timing &
Control
Timing &
Control
Timing &
Control
ATSC Transport is based on the MPEG-2 Systems Spec
(ISO/IEC 13818-1), which covers Muxing, Timing and Control
5
© 1995-99
Sarnoff Corporation
ISO/IEC 13818-1 Highlights
• Supports two constructs
– Transport Stream
• For error-prone applications
• Transport System Target Decoder (T-STD)
• Program Specific Information (PSI)
– Program Stream
• For error-free applications
• Program System Target Decoder (P-STD)
• Program Stream Map and Directory
– Supports conversion via Packetized Elementary Stream
(PES)
• Defines Program and Program Element
Descriptors
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