Data fragment transmitting and dispatching method and system in P2P streaming media system based on SVC

A media system and data fragmentation technology, applied in selective content distribution, image communication, electrical components, etc., can solve problems such as video quality degradation, easy loss, and affecting user experience, so as to improve the transmission success rate and ensure viewing experience Effect

Inactive Publication Date: 2014-07-02
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

For SVC data, due to the existence of decoding dependencies, lower-level fragmentation is more important than high-level fragmentation. The loss of lower-level fragmentation will cause a significant decline in video quality and seriously affect user experience.
Therefore, the equal-time-length fragmentation method in the existing SVC-based P2P video streaming system has the disadvantage that the lower-level fragmentation is easy to lose, which leads to the degradation of video quality at the receiving end.

Method used

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  • Data fragment transmitting and dispatching method and system in P2P streaming media system based on SVC
  • Data fragment transmitting and dispatching method and system in P2P streaming media system based on SVC
  • Data fragment transmitting and dispatching method and system in P2P streaming media system based on SVC

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The implementation method of the equal-size sharding method with time tags proposed by the present invention is as follows: figure 2 As shown, it specifically includes the following four steps:

[0037] 1) Separate the data in the SVC video according to its layer;

[0038] 2) Divide the data of each layer into fragments of equal size;

[0039] 3) Analyze the original SVC video to obtain the playback time information of all fragments;

[0040] 4) Add a time stamp to each fragment and store it in the P2P index information.

[0041] The key to realizing equal-sized shards with time tags is how to generate time tags for each shard. The present invention defines a concept called PTU (Playback Time Unit, playback time unit). A PTU contains data in a fixed number of GOPs, and can be regarded as a decoding unit ...

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Abstract

The invention relates to a data fragment transmitting and dispatching method and system in a P2P streaming media system based on SVC. The data fragment transmitting method includes the steps that (101) the data of a base layer and an enhancement layer in the P2P video streaming media system based on SVC are equally divided by using the data size as the unit, so that a plurality of equally-divided data pieces are obtained; (102) time labels are added to the equally-divided data pieces according to the steps as follows, and the equally-divided data pieces and the added time labels of all the equally-divided data pieces are connected and then transmitted; (102-1) each data layer is divided into a plurality of PTUs by using the decipher as the unit, namely one PTU corresponds to one decoding unit in a sub layer, the PTUs in each layer are numbered successively according to the playing time sequence, and accordingly PTU serial numbers are formed; (102-2) time labels PTU Seq-inSeq are added to all the equally-divided data pieces according to the playing time unit PTUs, the 'PTU Seq' in the time labels represents the PTU serial numbers which the equally-divided data pieces belong to, and inSeq represents the serial numbers of all the fragments of the PTUs which the equally-divided data pieces belong to.

Description

technical field [0001] The invention relates to computer network, multimedia communication and P2P technology, in particular to a method and system for data slice transmission and scheduling in an SVC-based P2P streaming media system. Background technique [0002] Combining Scalable Video Coding (SVC, Scalable Video Coding) technology with P2P technology can easily realize video data sharing among heterogeneous terminals. SVC encodes video into a base layer and one or more enhancement layers, and inter-layer data has a downward dependency when decoding: the base layer can be decoded independently and obtain a basic quality video, while the decoding of an enhanced layer requires The base layer and all lower enhancement layers, and the more enhancement layers decoded, the higher the quality of the video the user will watch. Compared with traditional video coding, the application of SVC in P2P streaming media system can obtain two benefits: on the one hand, users can dynamical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/63H04N21/845H04N21/854
Inventor 乐阳张棪周旭白帆宋俊平
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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