Service node selecting, updating and code rate adaptation method in distributed DASH system

A service node and distributed technology, which is applied in the field of audio and video transmission, can solve the problems of user experience quality degradation and performance degradation, and achieve the effects of reduced playback start-up delay, low start-up delay, and smooth playback

Active Publication Date: 2018-11-16
HUBEI UNIV
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Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a distributed DASH transmission system service node selection, update and code rate adaptive method, which solves the problem of user experience quality degradation caused by a single service node performance degradation or failure in a single server scenario problem, improve the robustness of system media transmission

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  • Service node selecting, updating and code rate adaptation method in distributed DASH system
  • Service node selecting, updating and code rate adaptation method in distributed DASH system
  • Service node selecting, updating and code rate adaptation method in distributed DASH system

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Embodiment Construction

[0024] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0025] A service node selection, update and code rate adaptive method in a distributed DASH system provided by this embodiment, wherein the distributed DASH system includes a single video source end, an entry server, several web content servers and several clients; the video source The end encodes the video into copies of different bit rates and cuts them into segments of equal length. The description information of these segments is stored in the MPD file; the MPD file is stored on the ingress server, and the segmented video files are stored on the Web conten...

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Abstract

The invention discloses a service node selecting, updating and code rate adaptation method in a distributed DASH system, and the method comprises the steps: requesting for the downloading of a first video segment from all candidate Web content servers, and sorting the server nodes according to an available network bandwidth; selecting the Web content server with the maximum available bandwidth asa service node of a data segmenting request; employing an additive-increase and multiplicative-decrease TCP-like slow start code rate selection method for dynamically obtaining the video segment froma plurality of Web content servers of the distributed DASH system, thereby effectively using the characteristics of the diversified service nodes in the distributed DASH system, and reducing the number of unnecessary buffering times in the play process while reducing the play start time delay. The method employs the service node and code rate selection method based on probability, and achieves thebalance among the fairness and smoothness of paly and the size change smoothness of a buffering region. Meanwhile, the method effectively solves a problem of unfair distribution of bandwidth caused by a condition that a plurality of video streams share the bandwidth in a fixed period scheduling strategy.

Description

technical field [0001] The invention belongs to the technical field of audio and video transmission, and relates to a service node selection, update and bit rate adaptive method, in particular to a service node selection, update and bit rate adaptive method in a distributed DASH system. Background technique [0002] With the rapid development of Internet and mobile communication technology, audio and video transmission business has become the mainstream business on the Internet, and people can obtain video resources anytime and anywhere through personal computers and mobile smart terminals. According to the "Cisco Visual Networking Index: Global Mobile Data Traffic Forecast Update (2016-2021 White Paper)" released by Cisco in March 2017, by 2021, more than three-quarters (78%) of the world's mobile data traffic will be video traffic. Dynamic Adaptive Streaming over HTTP (hereinafter referred to as DASH) based on HTTP has good firewall penetration capability and NAT conversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/845H04N21/647H04N21/24H04N21/2662H04N21/858H04N21/438
CPCH04N21/2401H04N21/2402H04N21/2662H04N21/438H04N21/64738H04N21/64769H04N21/64776H04N21/8456H04N21/8586
Inventor 杨红云陈旭辉
Owner HUBEI UNIV
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