Last N: Relevance-based selectivity for forwarding video in multimedia conferences

Boris Grozev, Lyubomir Marinov, Varun Singh, Emil Ivov

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

13 Citations (Scopus)

Abstract

Multiparty conferencing has traditionally been a relatively expensive application that was only used in enterprise scenarios. Recently, however, the landscape has started to shift in ways that could change this. Ever-increasing bandwidth and processing capabilities make it possible for mobile endpoints and laptop computers to easily handle multiple incoming media streams (both audio and video). The development of Web Real-Time Communications (WebRTC) has also significantly simplified the development of video conferencing applications and made them mainstream. Both of these changes provide a way of replacing expensive video mixers (that produce composited videos) with light-weight video routers (that selectively forward streams). In this paper, we describe a Multipoint Control Unit (MCU) that identifies and selects the last N dominant speakers and forwards their streams to all the conference participants. We evaluate the performance of this Selective Forwarding Unit (SFU) against a simplistic everyone-to-everyone (full-star) MCU. Our results show that the SFU uses 45% less CPU and 63% less bandwidth when forwarding media for 10 of the endpoints in a 30-participant conference.
Original languageEnglish
Title of host publicationProceedings of the 25th ACM Workshop on Network and Operating Systems Support for Digital Audio and Video, NOSSDAV 2015
PublisherACM
Pages19-24
Number of pages6
ISBN (Electronic)978-1-4503-3352-8
DOIs
Publication statusPublished - 1 Jan 2015
MoE publication typeA4 Article in a conference publication
EventACM SIGMM Workshop on Network and Operating Systems Support for Digital Audio and Video - New York, United States
Duration: 18 Mar 201620 Mar 2016
Conference number: 27

Conference

ConferenceACM SIGMM Workshop on Network and Operating Systems Support for Digital Audio and Video
Abbreviated titleNOSSDAV
CountryUnited States
CityNew York
Period18/03/201620/03/2016

Keywords

  • LastN
  • MCU
  • RTP
  • SFU
  • Videoconferencing
  • WebRTC

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