MMT Asset Transmission with Layer Dependency
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Solution Overview
Problem
The existing MPEG-2 TS standard is inadequate for modern multimedia transmission environments, particularly over the Internet, as it was developed for ATM networks and lacks support for hybrid delivery of multilayer media data with varying delivery characteristics across multiple paths.
Innovation Solution
The development of an MMT (MPEG Media Transport) system that includes an asset generator for encapsulating media data, composition information generator for MMT Composition Information (CI), and packetizer to create and transmit MMT packets, which contain dependency information for proper decoding of multilayer media assets across multiple paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If every layer of multilayer media data is included in a single MPU according to CMMT SoCD, then the MMT asset structure is simplified, but hybrid delivery with different delivery characteristics for individual layers cannot be supported
Solution Approach 1:
The patent segments multilayer media data into separate MPUs for each layer instead of combining them in a single MPU. Each layer (base layer and enhancement layers) is encapsulated as an independent MPU, allowing individual delivery characteristics to be assigned to each layer while maintaining the ability to reconstruct the complete media asset at the receiver.
2Reliability
If MMT assets are transmitted with dependency information between layers, then proper decoding of multilayer media can be achieved, but the transmission protocol complexity increases
Solution Approach 1:
The patent incorporates dependency information between MMT assets and layers into the transmission protocol in advance. The base layer and enhancement layers include metadata indicating their dependency relationships, allowing the receiver to properly reconstruct and decode the multilayer media without requiring complex real-time analysis of asset relationships.
Data Source
AI summary
A method for transmitting an MMT packet in an MMT (MPEG Media Transport) system includes: generating an MMT asset by performing encapsulation based on a Media Processing Unit (MPU) generated based on a media Access Unit (AU); generating MMT Composition Information on the MMT asset; generating an MMT packet by packetizing the MMT asset and the MMT-CI; and transmitting the generated MMT packet to a receiving side, wherein the MMT-CI may contain dependency information of the MMT asset on at least one other MMT asset. Accordingly, it is possible to indicate whether an MMT packet depends on other MMT assets when transmitting and receiving multi-layered media data, and to support proper decoding of the MMT asset when providing hybrid delivery-based MMT service.