Service node selection, update and rate adaptation method in distributed dash system

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...

AI Technical Summary

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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