ISOIEC 14496-15 Advanced Video Coding (AVC) file format.pdf

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INTERNATIONAL STANDARD ISO/IEC 14496-15 First edition 2004-04-15 Information technology — Coding of audio-visual objects — Part 15: Advanced Video Coding (AVC) file format Technologies de l'information — Codage des objets audiovisuels — Partie 15: Format de fichier de codage vidéo avancé (AVC) Reference number ISO/IEC 14496-15:2004(E)

ISO/IEC 14496-15:2004(E) ii

ISO/IEC 14496-15:2004(E) Contents Page Foreword ............................................................................................................................................................ iv Introduction ........................................................................................................................................................ v 1 2 3 3.1 3.2 Scope...................................................................................................................................................... 1 Normative references ........................................................................................................................... 1 Terms, definitions, symbols and abbreviated terms ......................................................................... 1 Terms and definitions........................................................................................................................... 1 Symbols and abbreviated terms.......................................................................................................... 2 Extensions to the ISO Base Media File Format.................................................................................. 2 4 Introduction ........................................................................................................................................... 2 4.1 File identification................................................................................................................................... 2 4.2 Independent and Disposable Samples Box ....................................................................................... 2 4.3 Sample groups ...................................................................................................................................... 3 4.4 4.4.1 Introduction ........................................................................................................................................... 3 4.4.2 SampleToGroup Box ............................................................................................................................ 4 4.4.3 SampleGroupDescription Box ............................................................................................................. 5 4.5 Random access recovery points ......................................................................................................... 6 4.5.1 Syntax..................................................................................................................................................... 6 4.5.2 Semantics .............................................................................................................................................. 6 4.6 Representation of new structures in movie fragments..................................................................... 7 AVC elementary streams and sample definitions ............................................................................. 7 5 Elementary stream structure ............................................................................................................... 7 5.1 Sample and Configuration definition .................................................................................................. 9 5.2 5.2.1 Introduction ........................................................................................................................................... 9 5.2.2 Canonical order and restrictions......................................................................................................... 9 5.2.3 AVC sample structure definition ....................................................................................................... 11 5.2.4 Decoder configuration information ................................................................................................... 11 Derivation from ISO Base Media File Format ................................................................................... 13 5.3 5.3.1 Introduction ......................................................................................................................................... 13 5.3.2 AVC File type and identification ........................................................................................................ 13 5.3.3 AVC Track Structure ........................................................................................................................... 13 5.3.4 AVC Video Stream Definition ............................................................................................................. 13 5.3.5 AVC parameter set stream definition................................................................................................ 15 5.3.6 Template fields used........................................................................................................................... 16 5.3.7 Visual width and height ...................................................................................................................... 16 5.3.8 Parameter sets .................................................................................................................................... 17 5.3.9 Decoding time (DTS) and composition time (CTS).......................................................................... 17 5.3.10 Sync sample (IDR)............................................................................................................................... 17 5.3.11 Shadow sync ....................................................................................................................................... 17 5.3.12 Layering and sub-sequences ............................................................................................................ 18 5.3.13 Alternate streams and switching pictures........................................................................................ 21 5.3.14 Random access recovery points ....................................................................................................... 23 5.3.15 Hinting .................................................................................................................................................. 23 iii

ISO/IEC 14496-15:2004(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. ISO/IEC 14496-15 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 14496 consists of the following parts, under the general title Information technology — Coding of audio-visual objects: Part 1: Systems Part 2: Visual Part 3: Audio Part 4: Conformance testing Part 5: Reference software Part 6: Delivery Multimedia Integration Framework (DMIF) Part 7: Optimized reference software for coding of audio-visual objects [Technical Report] Part 8: Carriage of ISO/IEC 14496 contents over IP networks Part 9: Reference hardware description [Technical Report] Part 10: Advanced Video Coding Part 11: Scene description and application engine Part 12: ISO base media file format Part 13: Intellectual Property Management and Protection (IPMP) extensions Part 14: MP4 file format Part 15: Advanced Video Coding (AVC) file format Part 16: Animation Framework eXtension (AFX) Part 17: Streaming text format Part 18: Font compression and streaming Part 19: Synthesized texture stream iv

ISO/IEC 14496-15:2004(E) Introduction The Advanced Video Coding (AVC) standard, jointly developed by the ITU-T and ISO/IEC SC29/WG11 (MPEG), offers not only increased coding efficiency and enhanced robustness, but also many features for the systems that use it. To enable the best visibility of, and access to, those features, and to enhance the opportunities for the interchange and interoperability of media, this part of ISO/IEC 14496 defines a storage format for video streams compressed using AVC. This part of ISO/IEC 14496 defines a storage format based on, and compatible with, the ISO Base Media File Format (ISO/IEC 14496-12 and ISO/IEC 15444-12), which is used by the MP4 file format (ISO/IEC 14496-14) and the Motion JPEG 2000 file format (ISO/IEC 15444-3) among others. This part of ISO/IEC 14496 enables AVC video streams to: be used in conjunction with other media streams, such as audio; be used in an MPEG-4 systems environment, if desired; be formatted for delivery by a streaming server, using hint tracks; inherit all the use cases and features of the ISO Base Media File Format on which MP4 and MJ2 are based. This part of ISO/IEC 14496 may be used as a standalone specification; it specifies how AVC content shall be stored in an ISO Base Media File Format compliant format. However, it is normally used in the context of a specification, such as the MP4 file format, derived from the ISO Base Media File Format, that permits the use of AVC video. The ISO Base Media File Format is becoming increasingly common as a general-purpose media container format for the exchange of digital media, and its use in this context should accelerate both adoption and interoperability. Extensions to the ISO Base Media File Format are defined here to support the new systems aspects of the AVC codec. v

ISO/IEC 14496-15:2004(E)

INTERNATIONAL STANDARD ISO/IEC 14496-15:2004(E) Information technology — Coding of audio-visual objects — Part 15: Advanced Video Coding (AVC) file format 1 Scope This part of ISO/IEC 14496 specifies the storage format for AVC (ISO/IEC 14496-10 | ITU-T Rec. H.264) video streams. The storage of AVC content uses the existing capabilities of the ISO Base Media File Format but also defines extensions to support the following features of the AVC codec: Switching pictures: To enable switching between different coded streams and substitution of pictures within the same stream. Sub-sequences and layers: Provides a structuring of the dependencies of a group of pictures to provide for a flexible stream structure (e.g. in terms of temporal scalability and layering). Parameter sets: The sequence and picture parameter set mechanism decouples the transmission of infrequently changing information from the transmission of coded macroblock data. Each slice containing the coded macroblock data references the picture parameter set containing its decoding parameters. In turn, the picture parameter set references a sequence parameter set that contains sequence level decoding parameter information. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 14496-1:2001, Information technology — Coding of audio-visual objects — Part 1: Systems ISO/IEC 14496-10, Information technology — Coding of audio-visual objects — Part 10: Advanced video coding | ITU-T Rec. H.264, Advanced video coding for generic audiovisual services ISO/IEC 14496-12, Information technology — Coding of audio-visual objects — Part 12: ISO base media file format (technically identical to ISO/IEC 15444-12) 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions the purposes of For ISO/IEC 14496-10 | ITU-T Rec. H.264 and the following apply. terms and definitions given this document, the in ISO/IEC 14496-1, 1

ISO/IEC 14496-15:2004(E) 3.1.1 parameter set a sequence parameter set or a picture parameter set, as defined in ISO/IEC 14496-10 NOTE This term is used to refer to both types of parameter sets. 3.1.2 parameter set elementary stream elementary stream containing samples made up of only sequence and picture parameter set NAL units synchronized with the video elementary stream 3.1.3 video elementary stream elementary stream containing access units made up of NAL units for coded picture data 3.2 Symbols and abbreviated terms AVC HRD IDR NAL PPS SEI SPS Advanced Video Coding [ISO/IEC 14496-10] Hypothetical Reference Decoder Instantaneous Decoding Refresh Network Abstraction Layer Picture Parameter Set Supplementary Enhancement Information Sequence Parameter Set 4 Extensions to the ISO Base Media File Format 4.1 Introduction This clause documents technical additions to the ISO Base Media File Format, which can be used when storing AVC streams. However, these additions could also be used by other media, if they are defined to use them. They are therefore documented here separately. 4.2 File identification The brand ‘avc1’ shall be used to indicate that extensions conformant with this section are used in a file. The use of ‘avc1’ as a major-brand may be permitted by specifications; in that case, that specification defines the file extension and required behaviour. 4.3 Independent and Disposable Samples Box ‘sdtp’ Box Types: Container: Sample Table Box (‘stbl’) Mandatory: No Quantity: Exactly one This optional table answers three questions about sample dependency: 1) Does this sample depend on others (is it an I-picture)? 2) Do no other samples depend on this one? 3) Does this sample contain multiple (redundant) encodings of the data at this time-instant (possibly with different dependencies)? 2

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