ISO/IEC 13818-4:2004/Amd 2:2005
(Amendment)Information technology - Generic coding of moving pictures and associated audio information - Part 4: Conformance testing - Amendment 2: Additional audio conformance test sequences
Information technology - Generic coding of moving pictures and associated audio information - Part 4: Conformance testing - Amendment 2: Additional audio conformance test sequences
Technologies de l'information — Codage générique des images animées et des informations sonores associées — Partie 4: Essais de conformité — Amendement 2: Séquences d'essais de conformité sonores additionnels
General Information
- Status
- Published
- Publication Date
- 12-Jun-2005
- Current Stage
- 6060 - International Standard published
- Start Date
- 13-Jun-2005
- Due Date
- 12-Dec-2006
- Completion Date
- 12-Dec-2006
Relations
- Effective Date
- 06-Jun-2022
- Effective Date
- 15-Apr-2008
Overview
ISO/IEC 13818-4:2004/Amd 2:2005 is an important amendment to the international standard covering generic coding of moving pictures and associated audio information, specifically focusing on Part 4: Conformance Testing. Published by ISO/IEC in 2005, this amendment introduces additional audio conformance test sequences that enhance the testing scope for MPEG-2 audio decoders.
As part of the MPEG-2 standard family, this document ensures interoperability and correctness of audio decoding implementations by providing a comprehensive suite of tests. It supports organizations and manufacturers in validating decoder compliance against strict criteria, thereby improving compatibility for multimedia systems worldwide.
Key Topics
Additional Audio Test Sequences: The amendment expands on existing test sequences by adding new compressed audio bitstreams and detailed descriptions covering MPEG-2 Layer I, II, and III audio coding. These test sequences simulate various audio signal scenarios, including tonal, noise, sweep, and silent segments for robust decoder testing.
File Naming Conventions: Detailed suffix conventions are introduced for test files, including:
l?-testXX.txt: Description filesl?-testXX.mpg: MPEG-2 audio bitstreamsl?-testXX.ext: Optional audio extension bitstreamsl?-testXX.pcmandl?-testXX.wav: Reference waveform files for comparison
Profile and Capability Specifications: The document references AAC decoder profiles and minimum capabilities, guiding how to assess conformance against Main, Low Complexity, and Scalable Sampling Rate (SSR) profiles with detailed channel configurations.
SBR (Spectral Band Replication) Testing: The amendment specifies compliance requirements for SBR compressed data embedding and testing procedures according to ISO/IEC 13818-7 and ISO/IEC 14496-4, ensuring High Efficiency AAC decoding compatibility.
Conformance Testing Procedures: Updated testing procedures emphasize output comparison with reference waveforms and outline allowances for intermediate signal processing stages, improving practical testing workflows for developers.
Applications
This standard amendment is crucial for:
- Audio codec developers aiming to certify their MPEG-2 audio decoders against internationally recognized conformance tests.
- Multimedia hardware manufacturers validating audio decoding performance in devices such as set-top boxes, digital TVs, and media players.
- Software developers implementing audio decoding features in multimedia frameworks, ensuring compliance with MPEG-2 audio profiles.
- Quality assurance teams conducting thorough interoperability and quality checks on audio codec implementations before market release.
- Standardization bodies and test laboratories maintaining test suites that support global conformity and interoperability of multimedia technologies.
By adhering to the conformance test sequences and procedures specified, stakeholders ensure consistent audio playback quality, compatibility with a broad array of MPEG-2 audio streams, and improved user experiences across platforms.
Related Standards
- ISO/IEC 13818-3: Defines MPEG-2 audio compression; foundational for creating and understanding MPEG-2 audio bitstreams.
- ISO/IEC 13818-7: Specifies AAC (Advanced Audio Coding) profiles and payload embedding, consulted for AAC decoder profiles and SBR integration.
- ISO/IEC 14496-3: Covers audio coding for MPEG-4 audiovisual objects, referenced for High Efficiency AAC and SBR decoding requirements.
- ISO/IEC 14496-4: Provides conformance testing procedures for MPEG-4, applicable for SBR conformance tests as extended in this amendment.
Keywords: ISO/IEC 13818-4 Amendment 2, MPEG-2 audio conformance testing, MPEG-2 Layer I/II/III test sequences, AAC decoder compliance, Spectral Band Replication (SBR), MPEG-2 audio codec validation, audio decoding standard, multimedia interoperability, audio conformance test suite.
Frequently Asked Questions
ISO/IEC 13818-4:2004/Amd 2:2005 is a standard published by the International Organization for Standardization (ISO). Its full title is "Information technology - Generic coding of moving pictures and associated audio information - Part 4: Conformance testing - Amendment 2: Additional audio conformance test sequences". This standard covers: Information technology - Generic coding of moving pictures and associated audio information - Part 4: Conformance testing - Amendment 2: Additional audio conformance test sequences
Information technology - Generic coding of moving pictures and associated audio information - Part 4: Conformance testing - Amendment 2: Additional audio conformance test sequences
ISO/IEC 13818-4:2004/Amd 2:2005 is classified under the following ICS (International Classification for Standards) categories: 35.040 - Information coding; 35.040.40 - Coding of audio, video, multimedia and hypermedia information. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO/IEC 13818-4:2004/Amd 2:2005 has the following relationships with other standards: It is inter standard links to ISO/IEC 13818-4:2004; is excused to ISO/IEC 13818-4:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/IEC 13818-4:2004/Amd 2:2005 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 13818-4
Second edition
2004-12-15
AMENDMENT 2
2005-06-15
Information technology — Generic
coding of moving pictures and
associated audio information —
Part 4:
Conformance testing
AMENDMENT 2:
Additional audio conformance test
sequences
Technologies de l'information — Codage générique des images
animées et des informations sonores associées —
Partie 4: Essais de conformité
AMENDEMENT 2 : Séquences d'essais de conformité sonores
additionnels
Reference number
ISO/IEC 13818-4:2004/Amd.2:2005(E)
©
ISO/IEC 2005
ISO/IEC 13818-4:2004/Amd.2:2005(E)
PDF disclaimer
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2) compressed bitstream files as described th
...
INTERNATIONAL ISO/IEC
STANDARD 13818-4
Second edition
2004-12-15
AMENDMENT 2
2005-06-15
Information technology — Generic
coding of moving pictures and
associated audio information —
Part 4:
Conformance testing
AMENDMENT 2:
Additional audio conformance test
sequences
Technologies de l'information — Codage générique des images
animées et des informations sonores associées —
Partie 4: Essais de conformité
AMENDEMENT 2: Séquences d'essais de conformité sonores
additionnels
Reference number
ISO/IEC 13818-4:2004/Amd.2:2005(E)
©
ISO/IEC 2005
ISO/IEC 13818-4:2004/Amd.2:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO/IEC 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
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Published in Switzerland
ii © ISO/IEC 2005 — All rights reserved
ISO/IEC 13818-4:2004/Amd.2:2005(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 2 to ISO/IEC 13818-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
information.
© ISO/IEC 2005 — All rights reserved iii
ISO/IEC 13818-4:2004/Amd.2:2005(E)
Information technology — Generic coding of moving pictures
and associated audio information —
Part 4:
Conformance testing
AMENDMENT 2: Additional audio conformance test sequences
In clause 2 (Normative references), add:
ISO/IEC 14496-3, Information technology — Coding of audio-visual objects — Part 3: Audio
ISO/IEC 14496-4, Information technology — Coding of audio-visual objects — Part 4: Conformance testing
In subclause 7.4.2 (Descriptions of the audio test bitstreams), replace:
Compressed bitstreams are provided, according to ISO/IEC 13818-3. Detailed descriptions of the bitstreams
are furnished below. The following file name extensions are used to identify different parts
testXX.mpg: MPEG-2 audio bitstream
testXX.ext: MPEG-2 audio extension bitstream (optional)
testXX.txt: description file
where XX stands for the bitstream number as indicated in tables 2-4 through 2-7.
with:
Compressed bitstreams are provided according to ISO/IEC 13818-3. Detailed descriptions of the bitstreams
are furnished below. The following file name extensions are used:
l?-testXX.txt: description file
l?-testXX.mpg: MPEG-2 audio bitstream
l?-testXX.ext: MPEG-2 audio extension bitstream (optional)
l?-testXX.pcm MPEG-2 audio reference waveform (raw)
l?-testXX.wav MPEG-2 audio reference waveform (wav format)
? stands for the layer (1, 2 or 3)
XX stands for the bitstream number as indicated in tables 2-4 through 2-8.
© ISO/IEC 2005 — All rights reserved 1
ISO/IEC 13818-4:2004/Amd.2:2005(E)
In subclause 7.4.2 (Descriptions of the audio test bitstreams), add to Table 4:
FEATURE BIT STREAM NUMBER
Layer II
matrix 2
extension N
transmission ch alloc Y
phantom Centre N
prediction N
Dyn Cross N
Sampling frequency 44.1
LFE N
Multi Lingual N
Multi Lingual Fs
ancillary data N
bitrate BASE stream 384
bitrate ext. stream
configuration 3/2
In subclause 7.4.2 (Descriptions of the audio test bitstreams), add to Table 7:
FEATURE BIT STREAM NUMBER
Layer II
Sampling frequency 24
bitrate 128
mode Stereo
ancillary data N
2 © ISO/IEC 2005 — All rights reserved
ISO/IEC 13818-4:2004/Amd.2:2005(E)
At the end of subclause 7.4.2 (Descriptions of the audio test bitstreams), add:
Table 7a
bitstream mnemonic layer signal characteristic sampling CRC mode bitrate
number frequency [kbit/s]
[kHz]
40 III tonal 16 none 11 all
bitrate_16_all
41 III tonal 22.05 none 11 all
bitrate_22_all
42 III tonal 24 none 11 all
bitrate_24_all
43 compl24 III sweep (10 Hz …20 kHz, 24 none 11 128
20 dB)
44 Noise III white noise 22.05 none 00 96
45 IS2 III white noise 22.05 none 01 160
46 MS2 III white noise 22.05 none 01 160
In subclause 8.4.1 (Profile Specification), replace:
The naming convention for ISO/IEC 13818-7 AAC decoders dictates that a decoder be specified as an A.L.I.D
Channel Profile ISO/IEC 13818-7 AAC Decoder, where A is replaced by the number of main
audio channels, L by the number of LFE channels, I by the number of independent coupling channels, D by
the number of dependently switched coupling channels, and Profile Name by the actual profile name (Main,
Low-Complexity, or Scalable Sampling Rate). An example would be a 5.1.1.1 Channel Main Profile ISO/IEC
13818-7 AAC Decoder, indicating a decoder capable of decoding 5 main audio channels, one LFE channel,
one independent coupling channel, and one
...
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