International organisation for standardisation organisation internationale de normalisation
Action Points 30MMT (23008-1)
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- 30.3Summary of discussions
29.4Action Points30MMT (23008-1)30.1Topics30.1.1ISO/IEC 23008-1 1st edition30.2Contributions
30.3Summary of discussionsm24227 It proposes revised WD at Paris AHG meeting. Improved definitions and introductions of each functional area are proposed. m25001 It provides editorial comments to current WD. m25088 It proposes synchronization method for hybrid delivery assuming two different servers are involved. It proposes to signal NTP based timing information to signal the part of content to be synchronized. However, there is no definitive relationship between NTP based time and the presentation time, the position of presentation cannot be predicted. It is recommended to rely on server-server communication to predict the position. If the client report is required, the presentation time related information should be used. m25150 It proposes message format for reception quality feedback, packet_loss_ratio, payload_data_rate, inter_arrival_jitter, round_trip_time. Except payload_data_rate, it seems acceptable. It is commented broadband forum has more complete parameters, TR-069. m25063 It proposes signaling method for multi-screen service. It is agreed that there might be some information to be exchanged to notify the change of client environment. However, the proposed messages are not relevant to MMT. m25140 It provides analysis on the presentation timing model for hybrid delivery services. Several design criteria has been proposed. There is no specific technical proposal in the contribution. m24798 This contribution proposes hierarchical MMT CI structure appropriate for multi-path/hybrid delivery by referring mechanism. Assuming multiple servers are involved in generating CI. Good item for CE evaluation. How to fragment CI into multiple pieces? m24799 This contribution proposes to include user control information, which controls are allowed by the service provider, in CI. User Controls may include media controls (like Pause, Play, Rewind, Fast-forward, Zoom, and Pan), Video link control and application specific controls (navigation, jump, and move which are used commonly in gaming application). More discussion is needed in CE evaluation. m24797 This contribution provides a way to add the Delivery Characteristic Descriptor, originally proposed in m22641, into control information that add the DCD to MMT Transport Characteristics (this is called DCD-TC), and compare the two proposals; DCD-CONF from m22641 and DCD-TC. It proposes to include DCD into TC. This will be further discussed in CE. m25055 This contribution proposes to include route_selection_dependency_indicator in TC. It describes the preferable diversity level of delivery routes among the MMT Assets, whether multiple assets need to be delivered via separate delivery route or not. More discussion is needed further discussion in CE. m24772 This contribution proposes coding dependency information for MPU and AU, whether other MPUs or AUs are required to process current MPU or AU. However the proposed MPU structure does not give full dependency and layered structure of SVC streams. Therefore, there is no benefit. m25136 This contribution proposes MPU ID uniquely distinguishable from any other MPUs and which provides enough information identify what package and asset they belong to. It is conceptually acceptable but the proposed fixed length structure is too large. More study is needed in CE. m25138 This contribution proposes detailed syntax and semantics of MFU. Proposed syntax of layer_dependency_info is specific to SVC. It requires more study in CE m25139 This contribution proposes detailed syntax and semantics of MPU. Several fields need more study in CE. m25000 This contribution proposes syntax and semantics for MFU to signal layering information of SVC and MVC. It is not recommended to repeat the information already in the NALU Header. Intention of the proponent was to provide layering information for the client to select appropriate layers for presentation. It is recommended to propose information related to presentation for CI. m25062 This contribution proposes to signal the range of layers covered by the data carried in the packet at the MMT payload header. Detailed syntax needs to be further studied and generalized. There is also question of whether it should be placed in payload header or packet header. m24785 This contribution proposes generic simple ARQ related messages. It proposes extensible structure for other SDOs can define their own extension. m25137 This contribution proposes syntax and semantics of MMT payload header. Some fields need further study in CE. Yüklə 4,35 Mb. Dostları ilə paylaş:
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