1、 Recommendation ITU-R BT.2055-0(02/2014)Content elements in multimediabroadcasting systemsfor mobile receptionBT SeriesBroadcasting service(television)ii Rec. ITU-R BT.2055-0 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the
2、radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regiona
3、l Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submiss
4、ion of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Reco
5、mmendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur
6、 and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathe
7、ring TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2014 ITU 2014 All rights reserved. No part of this publication may be re
8、produced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.2055-0 1 RECOMMENDATION ITU-R BT.2055-0 Content elements in multimedia broadcasting systems for mobile reception (Question ITU-R 45-4/6) (2014) Scope This Recommendation deals with content elements appropriate in mul
9、timedia broadcasting systems for mobile reception. Specifications are given for media type constituting multimedia content, for the coding schemes of each media type, and for methods for content navigation and interactivity. The ITU Radiocommunication Assembly, considering a) that digital television
10、 and sound broadcasting systems have been implemented in many countries; b) that multimedia broadcasting services for mobile reception have been or are planned to be introduced using the inherent capability of digital broadcasting systems; c) that the characteristics of mobile reception are quite di
11、fferent from those of fixed reception; d) that digital broadcasting services are expected to be offered in a variety of reception environments including indoor, portable, handheld and vehicular receivers; e) that the display sizes and receiver capabilities of handheld, portable and vehicular receive
12、rs are different from those of fixed receivers; f) that a special case of mobile reception by handheld receivers requires specific technical characteristics; g) the need for flexible configuration of a wide variety of services; h) the need for interoperability between mobile telecommunication servic
13、es and interactive digital broadcasting services; j) that there should be appropriate content elements for multimedia content in broadcasting systems for mobile reception, recommends 1 that for content elements in multimedia broadcasting systems for mobile reception, the media type, media coding sch
14、emes, and methods for content navigation and interactivity described in Annex 1 should be used; 2 that compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Rec
15、ommendation is achieved when all of these mandatory provisions are met. The words “shall” or some other obligatory language such as “must” and the negative equivalents are used to express requirements. The use of such words shall in no way be construed to imply partial or total compliance with this
16、Recommendation. 2 Rec. ITU-R BT.2055-0 Annex 1 Content elements in multimedia broadcasting systems for mobile reception 1 Introduction Many digital television and sound broadcasting systems providing high-quality programmes to many viewers have already been deployed. Programme reuse would be facilit
17、ated if fixed and mobile receivers use the same programme format. The display sizes of mobile receivers are different from those of fixed receivers, however, and the use cases of mobile reception are quite different from those of fixed reception. Non-real-time services may be provided for mobile rec
18、eption because mobile receivers cannot always receive signals from broadcast stations. The characteristics peculiar to mobile reception determine which content elements are appropriate for mobile reception. This Recommendation describes content elements appropriate in multimedia broadcasting systems
19、 for mobile reception. In this context, “content” means programme material and related information of any kind. 2 References Recommendation ITU-T H.222.0 | ISO/IEC 13818-1: Information Technology Generic coding of moving pictures and associated audio information Part 1: Systems. Recommendation ITU-T
20、 H.264 | ISO/IEC 14496-10: Information technology Coding of audio-visual objects Part 10: Advanced Video Coding. Recommendation ITU-T H.750: High-level specification of metadata for IPTV services. ETSI TS 102 428: Digital Audio Broadcasting (DAB); DMB video service; User application specification. E
21、TSI TS 102 471: Digital Video Broadcasting (DVB); IP Datacast over DVB-H: Electronic Service Guide (ESG). ETSI TS 102 005: Digital Video Broadcasting (DVB); Specification for the use of Video and Audio Coding in DVB services delivered directly over IP protocols. ISO/IEC 10918-1: Information technolo
22、gy Digital compression and coding of continuous-tone still images: Requirements and guidelines. ISO/IEC 11172-3: Information technology Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s Part 3: Audio. ISO/IEC 13818-3: Information technology Generic co
23、ding of moving pictures and associated audio information Part 3: Audio. ISO/IEC 13818-7: Information technology Generic coding of moving pictures and associated audio information Part 7: Advanced Audio Coding (AAC). ISO/IEC 14496-1: Information technology Coding of audio-visual objects Part 1: Syste
24、ms. ISO/IEC 14496-2: Information technology Coding of audio-visual objects Part 2: Visual. ISO/IEC 14496-3: Information technology Coding of audio-visual objects Part 3: Audio. ISO/IEC 14496-14: Information technology Coding of audio-visual objects Part 14: MP4 file format. Rec. ITU-R BT.2055-0 3 IS
25、O/IEC 23003-1: Information technology MPEG audio technologies Part 1: MPEG Surround. 3GPP TS 26.245: Transparent end-to-end Packet switched Streaming Service (PSS); Timed text. ARIB STD-B24 Volume 1: Data Coding and Transmission Specification for Digital Broadcasting. Doc. CEA-708-C: Digital Televis
26、ion (DTV) Closed Captioning. Open Mobile Alliance, OMA-TS-BCAST_Service_Guide-V1_0: Service Guide for Mobile Broadcast Services. SMPTE 421M: VC-1 Compressed Video Bitstream Format and Decoding Process. 3 Abbreviations 3GPP 3rdGeneration Partnership Project No. 1 AAC Advanced audio coding AIFF Audio
27、interchange file format AMR-WB Adaptive multi rate wide band ASCII American Standard Code for Information Interchange AVC Advanced video coding BIFS Binary format for scene description BML Broadcast mark-up language BMP Bit map CEA Consumer Electronics Association ER-BSAC Error resilience Bit sliced
28、 arithmetic coding ESG Electronic service guide GIF Graphics interchange format HE-AAC High efficiency advanced audio coding IEC International Electrotechnical Commission ISO International Organization for Standardization JPEG Joint Photographic Experts Group MIME Multipurpose internet mail extensio
29、n MNG Multiple-image network graphics MPEG Motion Picture Experts Group OMA Open Mobile Alliance PNG Portable networks graphics PSI/SI Programme specific information/service information SMPTE Society of Motion Picture and Television Engineers SVC Scalable video coding RME Rich media environment VC-1
30、 SMPTE 421M-2006 video codec standard XML extensible markup language 4 Rec. ITU-R BT.2055-0 4 Media type Multimedia content elements are classified into audio, video and data. For file delivery, audio, video and other elements can be packed into file data. Media types appropriate for content element
31、s in multimedia broadcasting systems for mobile reception are listed in Table 1. TABLE 1 Media types of content elements Media type Description Audio Format Coding scheme Mono Stereo Surround MPEG-1/MPEG-2 Audio Layer II1MPEG-2 AAC (ISO/IEC 13818-7)1MPEG-4 HE-AAC (ISO/IEC 14496-3) MPEG-4 HE-AAC v2 (
32、ISO/IEC 14496-3)1MPEG-4 ER BSAC (ISO/IEC 14496-3) MPEG Surround (ISO/IEC 23003-1)1AMR-WB+ AIFF-C HiQ Audio 2 Video Resolution Frame rate Coding scheme 320 180, 320 240, 384 224, 400 240, 416 240, 720 480, 832 480 Up to 60 ITU-T H.264/MPEG-4 AVC (ISO/IEC 14496-10)2ITU-T H.264/MPEG-4 SVC (ISO/IEC 1449
33、6-10 Annex G) VC-1 (SMPTE 421M) Data Category Coding scheme Text ASCII text Still image BMP GIF MNG JPEG PNG Closed caption CEA 708 closed captioning 3GPP timed text Container Self-declared MIME format MP4 3GP Binary data N/A 1This coding scheme is described in Recommendation ITU-R BS.1196. 2This co
34、ding scheme is described in Recommendation ITU-R BT.1870. Rec. ITU-R BT.2055-0 5 5 Content navigation methods Content navigation enables end users to find and select services quickly. In mobile environments, the ability to navigate through broadcast services easily is especially important. An exampl
35、e of content navigation is provided by the Electronic Service Guide (ESG), which contains information about the available services and how they can be accessed. Table 2 lists content navigation methods appropriate in multimedia broadcasting systems for mobile reception. TABLE 2 Content navigation me
36、thods OMA Service Guide MPEG-2 PSI/SI MPEG-2 PSI/SI and XML scheme (ITU-T H.750) 6 Interactivity methods An interactive environment for users of mobile services has become a basic requirement. Wide-scale interactive capabilities can be provided by telecommunication networks, and local interactive se
37、rvices can be provided without telecommunication networks. Interactive applications can also be provided by data elements listed in Table 1. Table 3 lists interactivity methods appropriate in multimedia broadcasting systems for mobile reception. TABLE 3 Interactivity methods BML Hypertext linkage MPEG-4 BIFS OMA-RME (Rich Media Environment) _
