1、 Recommendation ITU-R BT.2056-0(02/2014)High-level guidelines for the international exchange of HDTV programmes over IP connections for contribution purposesBT SeriesBroadcasting service(television)ii Rec. ITU-R BT.2056-0 Foreword The role of the Radiocommunication Sector is to ensure the rational,
2、equitable, efficient and economical use of the 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 Radiocommunic
3、ation Sector are performed by World and Regional 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 Resol
4、ution ITU-R 1. Forms to be used for the submission 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 d
5、atabase can also be found. Series of ITU-R Recommendations (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 Fixe
6、d service M Mobile, radiodetermination, amateur 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
7、SM Spectrum management SNG Satellite news gathering 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
8、reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.2056-0 1 RECOMMENDATION ITU-R BT.2056-0 High-level guidelines for the international exchange of HDTV programmes over IP connections for contribution purposes1(2014) Scop
9、e This Recommendation specifies some high-level guidelines applicable to IP-based connections used for the international exchange of sound and television programmes for contribution purposes. It is expected when dealing with IP service providers, the specified requirements will help in selecting sou
10、rce-coding, multiplexing and IP-based transport methods to be used for such programme exchanges, and to standardization of appropriate metadata, used to describe the programme content and the IP-based transport parameters. The ITU Radiocommunication Assembly, considering a) that broadcasters and com
11、panies involved in television programme production and postproduction are beginning to use IP-based connections to transport HDTV programmes among studios and for international programme exchange; b) that such transports would be facilitated if a single method or a small number of alternative method
12、s were specified to implement them; c) that the choice of the encoding, multiplexing and transport methods to be used for such exchanges should be based on the knowledge of the performance requirements that they should meet in order to respond to the needs of IP-based international sound and televis
13、ion programme exchange, recognizing that the specifications of performance requirements for the transport of sound and television programmes for international programme exchange are in the purview of ITU-R Study Group 6, noting that the guidelines outlined in this Recommendation are intended to assi
14、st those considering the use of IP-based networks for programme contribution, further noting that ITU-R Recommendations will be developed providing more detail on parameters such as the use of data rate conversion, multiplexing, the “wrapper” and any necessary programme related data, 1The ITU Termin
15、ology Database defines a contribution link as “a link for the transmission of sound or television broadcasting signals to a programme production centre”. 2 Rec. ITU-R BT.2056-0 recommends that in the choice of methods to encode, multiplex and transport HDTV programmes over IP-based networks for inte
16、rnational exchange, the guidelines listed in the Annex to this Recommendation should be considered, together with any further requirements that may apply due to programme-specific circumstances (e.g. contractual requirements specific to the transport of a particular programme), in order that the IP
17、network service provider clearly understands the requirements of the broadcaster. Annex (normative) High-level guidelines for the international exchange of HDTV programmes over IP-based networks for contribution purposes It is common practice in international programme exchange that the programme pr
18、ovider (e.g. the programme producer or the distributor) and the programme recipient (e.g. the broadcaster) mutually agree on the choice of the source-coding, wrapper and transport method within a reasonably small range of options. Typically, the programme recipient will indicate the performance requ
19、irements for the programmes delivery, and the programme provider will indicate the cost to abide by those performance requirements. Within this framework, this Annex specifies some guidance applicable to the international exchange of HDTV programmes over IP-based networks for contribution purposes w
20、here the programme provider may be negotiating with IP network service providers unfamiliar with traditional broadcast infrastructure parameters. 1 The baseband specifications of each individual component (video, audio, ancillary data) of an internationally exchanged HDTV programme should always com
21、ply with the relevant ITU Recommendations. 2 Each individual baseband component of the programme should normally be internationally exchanged after transparent or quasi transparent2source-coding, unless there is a requirement to transfer it in an uncompressed form, e.g. when it is envisaged that it
22、will undergo very complex post-processing at the receiving facility. 3 All the source-coded components of the programme should be internationally exchanged after they have been multiplexed into a “wrapper” designed to transport them all in a single data stream, keeping them synchronized with each ot
23、her. 4 Since sound and television programmes represent a valuable intellectual property, they should be protected against piracy or unauthorized access during their transport3. 2A “transparent” bit rate reduction method is one that does not affect the subjective quality of sound or picture sequences
24、.3This can be accomplished, for instance, through provisions such as password access with frequent password changes, certification of IP source and destination addresses, and content watermarking to ease identification of illegal copies. Rec. ITU-R BT.2056-0 3 5 The IP-based transport mechanism shou
25、ld transparently transport the programme data stream, including the programme-related metadata that accompanies the programme, without applying transcoding or new source coding. 6 The metadata that accompanies the programme should convey encoded information that allows decoding at least the followin
26、g information: the programme content (e.g. the title, subtitle, and episode of the programme and its playing time); the video and the audio baseband system; the source-coding; the wrapper; the data required to securely protect the intellectual property rights to the programme, etc. 7 The IP operator
27、 charged with the transport of an internationally exchanged programme should engage to comply with the modalities for the IP-based transport of the programme, as agreed between the programme provider and the programme recipient; those modalities typically include the required transfer data rate, the
28、 maximum permitted data-error rate, the availability ratio of the connection4and other performance aspects such as the maximum permitted latency of the connection in the case of real-time programme streaming. 4The ITU Terminology Database defines the availability ratio of a connection as the proportion of time that the connection is in the available state during a given observation period; it is calculated by dividing the total available time during the observation period by the duration of the observation period.
