Change search
ReferencesLink to record
Permanent link

Direct link
Evaluating QoS and QoE Dimensions in Adaptive Video Streaming
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Telematics.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

The focus of this thesis has been on Quality of Service (QoS) and Quality of Experience (QoE) dimensions of adaptive video streaming. By carrying out a literature study reviewing the state of the art on QoS and QoE we have proposed several quality metrics applicable to adaptive video streaming, amongst them: initial buffering time, mean duration of a rebuffering event, rebuffering frequency, quality transitions and bitrate. Perhaps counterintuitively, other research has found that a higher bitrate does not always lead to a higher degree of QoE. If one look at bitrate in relation to quality transitions it has been found that users could prefer a stable video stream, with fewer quality transitions, at the cost of an overall higher bitrate. We have conducted two case studies to see if this is considered by today’s adaptive video streaming technologies. The case studies have been performed by means of measurements on the players of Tv2 Sumo and Comoyo. We have exposed the players to packet loss and observed their behavior by using tools such as Wireshark. Our results indicate that neither player take the cost of quality transitions into account in their rate adaptation logic, the players rather strive for a higher quality level. In both cases we have observed a relatively large number of quality transitions throughout the various sessions. If we were to give any recommendations to the Over-the-Top (OTT) service providers, we would advise them to investigate the effects of quality transitions and consider including a solution for handling potentially negative effects in the rate adaptation logic of the player.

Place, publisher, year, edition, pages
Institutt for telematikk , 2012. , 118 p.
Keyword [no]
ntnudaim:7299, MTKOM kommunikasjonsteknologi, Nett og tjenestekvalitet
URN: urn:nbn:no:ntnu:diva-18998Local ID: ntnudaim:7299OAI: diva2:566390
Available from: 2012-11-08 Created: 2012-11-08

Open Access in DiVA

fulltext(2702 kB)5403 downloads
File information
File name FULLTEXT01.pdfFile size 2702 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)19 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf
attachment(3098 kB)89 downloads
File information
File name ATTACHMENT01.zipFile size 3098 kBChecksum SHA-512
Type attachmentMimetype application/zip

By organisation
Department of Telematics

Search outside of DiVA

GoogleGoogle Scholar
Total: 5403 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 287 hits
ReferencesLink to record
Permanent link

Direct link