ISO/IEC 11172-1:1993/Cor 2:1999

Information technology — Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s — Part 1: Systems — Technical Corrigendum 2

Technologies de l'information — Codage de l'image animée et du son associé pour les supports de stockage numérique jusqu'à environ 1,5 Mbit/s — Partie 1: Systèmes — Rectificatif technique 2

General Information

• Status: Published
• Publication Date: 10-Nov-1999
• ICS: 35.040 - Information coding
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 6060 - International Standard published
• Start Date: 11-Nov-1999
• Completion Date: 12-Feb-2026

Relations

• Corrects: ISO/IEC 11172-1:1993 - Information technology — Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s — Part 1: Systems
• Effective Date: 06-Jun-2022
• Child: ISO/IEC 11172-1:1993 - Information technology — Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s — Part 1: Systems
• Effective Date: 15-Apr-2008

Overview

ISO/IEC 11172-1:1993/Cor 2:1999 is Technical Corrigendum 2 to the MPEG-1 Systems standard. It publishes corrections and clarifications to the original Part 1 text for coding moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s. The corrigendum updates key algorithmic formulas, timing relationships, sample stream examples and many subclause headings to remove ambiguity for implementers of MPEG-1 systems, multiplexing and decoding workflows.

Key Topics

• Corrections to multiplexing calculations - the corrigendum amends the formula in A.5.4 that relates video/audio data rates, packet headers and packet data sizing used in stream rate computations.
• System Clock Reference (SCR) - explicit timing corrections: the SCR2 field is specified to occur 6 184 bytes after the first pack, with the corrected relation: SCR2 = SCR1 + 6 184 * 90 000 / 176 059
• Sample data stream - A.5.9 replaces the sample stream table, showing corrected pack and packet sequences, start codes (e.g., 000001BA for pack_start_code), system header (000001BB), packet_start_code_prefix (000001), stream IDs (video E3, audio C0), packet_length, stuffing bytes, and PTS/DTS markers.
• Clarified function and section names - several subclauses were renamed or split for clarity, including definitions for bytealigned, nextbits, next_start_code, and structured subsections on System Clock Frequency, Input to the System Target Decoder, Buffering, Decoding, Presentation, Pack, System Header, Packet Rate, and System Target Decoder buffer size.
• Timing and timestamp fields - corrected presentation (PTS) and decoding (DTS) examples and placement within packet structures.

Applications and Who Uses This Standard

• Implementers of MPEG-1 encoders, multiplexers, decoders and firmware/software that handle low-bitrate digital storage media (around 1.5 Mbit/s).
• Developers and testers ensuring interoperability between stream producers and System Target Decoders (STDs).
• Engineers validating correct handling of SCR, PTS/DTS, packet structure, stuffing and system headers in hardware (ASIC/FPGA) and software players.
• Archivists and media system designers working with legacy MPEG-1 streams on constrained storage/media.

Related Standards

• ISO/IEC 11172 series (MPEG-1): Part 2 (Video) and Part 3 (Audio) - complements this Systems corrigendum.
• Later standards in the MPEG family expand or refine system and compression techniques (e.g., MPEG-2), for broader or higher-bitrate applications.

Keywords: ISO/IEC 11172-1, MPEG-1 Systems, Technical Corrigendum 2, SCR2, PTS DTS, packet_start_code, multiplexing, system target decoder, buffering, 1.5 Mbit/s.

Standards Content (Sample)

INTERNATIONAL STANDARD ISO/IEC 11172-1:1993
TECHNICAL CORRIGENDUM 2
Published 1999-11-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION � МЕЖДУНАРОДНАЯОРГАНИЗАЦИЯПОСТАНДАРТИЗАЦИИ � ORGANISATION INTERNATIONALE DE NORMALISATION
INTERNATIONAL ELECTROTECHNICAL COMMISSION � МЕЖДУНАРОДНАЯ ЭЛЕКТРОТЕХНИЧЕСКАЯ КОМИССИЯ � COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
Information technology — Coding of moving pictures and
associated audio for digital storage media at up to about
1,5Mbit/s—
Part 1:
Systems
TECHNICAL CORRIGENDUM 2
Technologies de l'information — Codage de l'image animée et du son associé pour les supports de stockage
numérique jusqu'à environ 1,5 Mbit/s —
Partie 1: Systèmes
RECTIFICATIF TECHNIQUE 2
Technical Corrigendum 2 to International Standard ISO/IEC 11172-1:1993 was prepared by Joint Technical
Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and
hypermedia information.
1) Replace subclause A.5.4 (page 40, line 39) by:
“
R = (video data rate + audio data rate) *
mux
( packet _ header _ size� pack _ header _ size / packets _ per _ pack)
(1� )
packet _ data _ size
”.
ICS 681.3.04(084.14) Ref. No. ISO/IEC 11172-1:1993/Cor.2:1999(E)
© ISO/IEC 1999 – All rights reserved
Printed in Switzerland
ISO/IEC 11172-1:1993/Cor.2:1999(E)
2) Replace subclause A.5.4 (page 41, line 3) by:
“
The SCR2 field occurs 6 184 bytes after the first pack’s.
”.
3) Replace subclause A.5.4 (page 41, line 6) by:
“
SCR2 = SCR1 + 6 184 * 90 000/176 059
”.
4) Replace subclause A.5.9, a table of Sample data stream by:
“
A.5.9 Sample data stream
No. of Field Description Coded Values
Bytes
4 pack_start_code (#1) 000001BA
1 '0010', SCR-32 thru 30 , marker_bit 21
2 SCR-29 thru 15 , marker_bit 0001
2 SCR-14 thru 0 , marker_bit 1E81
3 marker_bit, mux_rate, marker_bit 801B83
4 system_header_start_code 000001BB
2 header_length 000C
3 marker_bit, rate_bound , marker_bit 801B83
1 audio_bound, fixed_flag , CSPS_flag 07
1 system_audio_lock_flag, system_video_lock_flag, A1
1 reserved_byte FF
1 stream_id (audio) C0
2 '11', STD_buffer_bound_scale , STD_buffer_size_bound C020
1 stream_id (video) E3
2 '11', STD_buffer_bound_scale , STD_buffer_size_bound E02E
3 packet_start_code_prefix 000001
1 stream_id (padding) BE
2 packet_length 0004
1 '0000 1111' 0F
1 '1111 1111' FF
1 '1111 1111' FF
1 '1111 1111' FF
3 packet_start_code_prefix (#1V) 000001
1 stream_id (video) E3
2 packet_length 07FA
2 stuffing_byte FFFF
2 ‘01’, STD_buffer_scale, STD_buffer_size 602E
1 '0011', PTS-32 thru 30 , marker_bit 31
2 PTS-29 thru 15 , marker_bit 0001
2 PTS-14 thru 0 , marker_bit CE49
1 '0001', DTS-32 thru 30 , marker_bit 11
2 DTS-29 thru 15 , marker_bit 0001
2 DTS-14 thru 0 , marker_bit B229
2 028 packet_data_byte XXX.X
3 packet_start_code_prefix (#2V) 000001
1 stream_id E3
2 © ISO/IEC 1999 – All rights reserved

ISO/IEC 11172-1:1993/Cor.2:1999(E)
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
3 packet_start_code_prefix (#3V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
4 pack_start_code (#2) 000001BA
1 '0010', SCR-32 thru 30 , marker_bit 21
2 SCR-29 thru 15 , marker_bit 0001
2 SCR-14 thru 0 , marker_bit 3733
3 marker_bit, mux_rate , marker_bit 801B83
3 packet_start_code_prefix (#4V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_bytes FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
3 packet_start_code_prefix (#5V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
3 packet_start_code_prefix (#6V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
4 pack_start_code (#3) 000001BA
1 '0010', SCR-32 thru 30 , marker_bit 21
2 SCR-29 thru 15 , marker_bit 0001
2 SCR-14 thru 0 , marker_bit 47C9
3 marker_bit, mux_rate , marker_bit 801B83
3 packet_start_code_prefix (#7V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
© ISO/IEC 1999 – All rights reserved 3

ISO/IEC 11172-1:1993/Cor.2:1999(E)
3 packet_start_code_prefix (#8V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
3 packet_start_code_prefix (#9V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF.FF
1 ‘0000 1111’ 0F
2 028 packet_data_byte XXX.X
4 pack_start_code (#4) 000001BA
1 '0010', SCR-32 thru 30 , marker_bit 21
2 SCR-29 thru 15 , marker_bit 0001
2 SCR-14 thru 0 , marker_bit 685F
3 marker_bit, mux_rate , marker_bit 801B83
3 packet_start_code_prefix (#10V) 000001
1 stream_id E3
2 packet_length 07FA
2 stuffing_byte FFFF
2 '01', STD_buffer_scale , STD_buffer_size 602E
1 '0011', PTS-32 thru 30 , marker_bit 31
2 PTS-29 thru 15 , marker_bit 0003
2 PTS-14 thru 0 , marker_bit 22A9
1 '0001', DTS-32 thru 30 , marker_bit 11
2 DTS-29 thru 15 , marker_bit 0001
2 DTS-14 thru 0 , marker_bit CE49
2 028 packet_data_byte XXX.X
3 packet_start_code_prefix (#11V) 000001
1 stream_id E3
2 packet_length 07FA
13 stuffing_byte FF
...