ISO IEC 23009-1 CORR 1-2015 Information technology - Dynamic adaptive streaming over HTTP (DASH) - Part 1 Media presentation description and segment formats Tec.pdf
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1、INTERNATIONAL STANDARD ISO/IEC 23009-1:2014 TECHNICAL CORRIGENDUM 1 Published 2015-04-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALE Information technology Dynamic adap
2、tive streaming over HTTP (DASH) Part 1: Media presentation description and segment formats TECHNICAL CORRIGENDUM 1 Technologies de linformation Diffusion en flux adaptatif dynamique sur HTTP (DASH) Partie 1: Description de la prsentation et formats de remise des mdias RECTIFICATIF TECHNIQUE 1 Techni
3、cal Corrigendum 1 to ISO/IEC 23009-1:2013 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. Replace 4.5.1 Switching and Random Access Support The formats defined in this part of the st
4、andard are designed for providing good user experience even in case the access bandwidth of the DASH segment delivery or the cache varies. A key functionality is the ability that the DASH client can seamlessly switch across different Representations of the same media component. DASH clients may use
5、the common timeline across different Representation representing the same media component to present one Representation up to a certain time t and continue presentation of another Representation from time t onwards. However, in practical implementations, this operation may be complex, as switching a
6、t time t may require parallel download and decoding of two Representations. Therefore, providing suitable switching opportunities in regular time intervals simplifies client implementations. The ICS 35.040 Ref. No. ISO/IEC 23009-1:2014/Cor.1:2015(E) ISO/IEC 2015 All rights reserved Published in Swit
7、zerlandISO/IEC 23009-1:2014/Cor.1:2015 (E) 2 ISO/IEC 2015 All rights reservedstandard provides means for providing suitable switching opportunities and in addition provides abilities to signal the position and media time of the switching opportunities. For this purpose this subsection defines three
8、relevant concepts to support seamless switching, namely Media stream access points in 4.5.2 to signal positions where to easily switch to a Representation, and in addition where to suitable access a Representation at start-up or seek. Non-overlapping Segments and Subsegments in 4.5.3 to signal that
9、at the signalled stream access points, no overlap decoding of Representations is necessary in order to provide a continuous switch Bitstream concatenation in 4.5.4 to signal that the concatenation of two Representations at a switch point results in a conforming bitstream These three properties are n
10、either sufficient nor necessary for seamless switching, but certain implementation or profiles may use these properties in order to simplify practical implementations. with 4.5.1 Switching and Random Access Support The formats defined in this part of the standard are designed for providing good user
11、 experience even in case the access bandwidth between the DASH segment delivery function or the cache varies. A key functionality is the ability that the DASH client can seamlessly switch across different Representations of the same media component without severely impacting the user experience. Ass
12、ume two Representations A and B. A switch from Representations A to Representation B at media time t is considered seamless, if the result of the presentation a fter this switch is applied is identical as if Representation A is decoded from the beginning and presented up to time t and Representation
13、 B is decoded from the beginning and presented from time t onwards. Media Presentations may provide different Representations in one Adaptation Set representing the same media component. If such Representations are properly time-aligned (as expected by the Media Presentation), then DASH clients may
14、apply seamless switching across different Representations provided in one Adaptation Set at any time t to obtain a perceptually continuous experience. However, in practical implementations, the operation of seamless switching may be complex, as switching at time t may require parallel download and d
15、ecoding of two Representations. Therefore, providing suitable switching opportunities in regular time intervals simplifies client implementations. This part of ISO/IEC 23009- 1 provides means for providing suitable switching opportunities and in addition provides abilities to signal the position and
16、 media time of the switching opportunities. For this purpose this subsection defines three relevant concepts to support seamless switching: Media stream access points in 4.5.2 to signal positions where to easily switch to a Representation, and in addition where to suitable access a Representation at
17、 start-up or seek. Non-overlapping Segments and Subsegments in 4.5.3 to signal that at the signalled stream access points, no overlap decoding of Representations is necessary in order to provide a continuous switch. Bitstream concatenation in 4.5.4 to signal that the concatenation of two Representat
18、ions at a switch point results in a conforming bitstream. These three properties are neither sufficient nor necessary for seamless switching, but certain implementation or profiles may use these properties in order to simplify practical implementations. ISO/IEC 23009-1:2014/Cor.1:2015 (E) ISO/IEC 20
19、15 All rights reserved 3In 4.7 Schemes, Table 2 replace urn:mpeg:dash:23003:3:audio_chan nel_configuration:2011 5.8.5.4 channel configuration. urn:mpeg:dash:outputChannelPosit ionList:2012 5.8.5.4 a list of output channel position to signal individual speaker positions as defined in ISO/IEC 23001-8.
20、 With urn:mpeg:dash:23003:3:audio_chan nel_configuration:2011 5.8.5.4 channel configuration. NOTE: legacy format for backward-compatibility, it is recommended to use the signaling as defined in ISO/IEC 23001-8 instead. urn:mpeg:dash:outputChannelPosit ionList:2012 5.8.5.4 a list of output channel po
21、sition to signal individual speaker positions as defined in ISO/IEC 23001-8. NOTE: legacy format for backward-compatibility, it is recommended to use the signalling as defined in ISO/IEC 23001-8 instead. ISO/IEC 23009-1:2014/Cor.1:2015 (E) 4 ISO/IEC 2015 All rights reservedIn 5.2.3.2 Elements and At
22、tributes added in this Revision replace This revision adds the following elements and attributes to the schema defined in Annex B compared to the 2012 revision (ISO/IEC 23009-1:2012/Cor 1:2013) of this part of the standard: MPDpublishTime Period.AssetIdentifier Period.EventStream RepresentationBase.
23、InbandEventStream SegmentBaseavailabilityTimeOffset SegmentBaseavailabilityTimeComplete BaseURLavailabilityTimeOffset BaseURLavailabilityTimeComplete Subsetid with This revision adds the following elements and attributes to the schema defined in Annex B compared to the 2012 revision (ISO/IEC 23009-1
24、:2012/Cor 1:2013) of this part of the standard: MPDpublishTime MPD.EssentialProperty MPD.SupplementalProperty Period.AssetIdentifier Period.EventStream Period.SupplementalProperty RepresentationBase.InbandEventStream SegmentBaseavailabilityTimeOffset SegmentBaseavailabilityTimeComplete BaseURLavaila
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