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Oscillation Compensating Dynamic Adaptive Streaming over HTTP
This document discusses oscillation compensation in adaptive streaming over HTTP. It presents a buffer-based adaptation algorithm that detects quality switching oscillations between clients. When oscillations are detected, the algorithm compensates by restricting quality level changes based on the fill state of the playback buffer and an oscillation factor. Experimental results show the approach reduces quality switching variance and improves streaming performance compared to a traditional throughput-based adaptation approach. Future work will evaluate the method at larger scales.
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Oscillation Compensating Dynamic Adaptive Streaming over HTTP
- 1. Oscillation Compensating Dynamic Adaptive Streaming over HTTP Christopher Mueller, Stefan Lederer, Reinhard Grandl, and Christian Timmerer Alpen-‐Adria-‐Universität Klagenfurt (AAU) w Faculty of Technical Sciences (TEWI) w Department of Information Technology (ITEC) w Multimedia Communication (MMC) w Sensory Experience Lab (SELab) http://blog.timmerer.com w http://selab.itec.aau.at/w http://dash.itec.aau.at w christian.timmerer@itec.aau.at Chief Innovation Officer (CIO) at bitmovin GmbH http://www.bitmovin.com w christian.timmerer@bitmovin.com Slides: http://www.slideshare.net/christian.timmerer IEEE ICME 2015, June 29 – July 3, 2015
- 2. July 2, 2015IEEE ICME 2015 2 Submission deadline: November 27, 2015 http://www.mmsys.org/ | http://mmsys2016.itec.aau.at/ | @mmsys2015
- 3. Outline • Introduction, Motivation, Problem Statement • Metrics and Tools • Buffer-‐based Adaptation Algorithm with Oscillation Detection and Compensation • Experimental Results • Conclusions and Future Work July 2, 2015 IEEE ICME 2015 3
- 4. Over-‐The-‐Top – Adaptive Media Streaming • In a Nutshell … Adaptation logic is within the client, not normatively specified by the standard,subject to research and development July 2, 2015 IEEE ICME 2015 4
- 5. Why do we do that? • HTTP-‐based multimedia streaming is being massively deployed – Accounts for more than 60% of Internet traffic in peak periods • Client-‐centric approach – Adaptation algorithm/logic – Client behavior subject to research – Throughput-‐basedvs. buffer-‐based • What happens when multiple clients compete with each other? July 2, 2015 IEEE ICME 2015 5 Source: Global Internet Phenomena Report: 2H 2014
- 6. What’s the problem? •Big Buck Bunny with different representations • Throughput-‐based adaptation • Common test setup w/ two clients and varying bandwidth July 2, 2015 IEEE ICME 2015 6 5HTXHVWHGq0HGLDq%LWUDWH 0ESV 3 4 f S c 5HTXHVWHGq0HGLDq%LWUDWH %XIIHU 6HFRQGV 3 43 f3 S3 c3 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 %XIIHU 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 Without cache
- 7. What’s the problem? •Big Buck Bunny with different representations • Throughput-‐based adaptation • Common test setup w/ two clients and varying bandwidth July 2, 2015 IEEE ICME 2015 7 5HTXHVWHGq0HGLDq%LWUDWH 0ESV 3 4 f S c 5HTXHVWHGq0HGLDq%LWUDWH %XIIHU 6HFRQGV 3 43 f3 S3 c3 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 %XIIHU 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 With cache
- 8. Our metrics and tools! • Adaptation-‐specific – Quality switching variance: change of representation – Oscillation variance: includes direction of switching • Buffer-‐specific – Buffer model restricting available quality levels • Based on buffer fill state • Fitting to available quality levels & network conditions • Different behavior: linear, exponential, logarithmic – Worst case buffer: minimum buffer fill state in seconds that shall be available prior to the download of segment July 2, 2015 IEEE ICME 2015 8
- 9. Our approach! (1/2) •Buffer-‐based adaptation algorithm including: – Oscillation detection – Oscillation compensation – Fully client-‐centric • Oscillation factor – Depends on quality switching variance and oscillation variance – Increases when both metrics become different July 2, 2015 IEEE ICME 2015 9
- 10. Our approach! (2/2) •Buffer-‐based adaptation – c … min. buffer level (aka steady state) – b … fitting based on a given c – a … max. representation bitrate • Compensation algorithm – Low & high comp. July 2, 2015 IEEE ICME 2015 10 /RJDULWKPLFg%LWUDWHg5HVWULFWLRQ 0D[LPXPgSYDLODEOHg%LWUDWH 0LQLPXPgSYDLODEOHg%LWUDWH SOORZHGg0HGLDg%LWUDWHg>0ESV@ u A v l b %XIIHUg)LOOg6WDWXVg>h@ u usv usb usd usp A
- 11. Our results! (1/2) July 2, 2015 IEEE ICME 2015 11 5HTXHVWHGq0HGLDq%LWUDWH 0ESV 3 4 f S c 5HTXHVWHGq0HGLDq%LWUDWH %XIIHU 6HFRQGV 3 43 f3 S3 c3 %XIIHU 2VFLOODWLRQq)DFWRU 3 3pf 3pc 3pn 3pl 4 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 2VFLOODWLRQq)DFWRU 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 5HTXHVWHGq0HGLDq%LWUDWH 0ESV 3 4 f S c 5HTXHVWHGq0HGLDq%LWUDWH %XIIHU 6HFRQGV 3 43 f3 S3 c3 %XIIHU 2VFLOODWLRQq)DFWRU 3 3pf 3pc 3pn 3pl 4 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 2VFLOODWLRQq)DFWRU 6HFRQGV 3 o3 433 4o3 f33 fo3 S33 W i t h o u t c a c h e W i t h c a c h e
- 12. Our results! (2/2) July 2, 2015 IEEE ICME 2015 12 /RJDULWKPLFg×XIIHUg0RGHOg3GDSWDWLRQ 7KURXJKSXWg0HDVXUHPHQWg3GDSWDWLRQ 4XDOLWg6ZLWFKLQJg9DULDQFHg>0ESVð@ pAy TîpAy 7LPHg>6HFRQGV@ A QA pAA pQA nAA nQA TAA Without cache /RJDULWKPLFg×XIIHUg0RGHOg3GDSWDWLRQ 7KURXJKSXWg0HDVXUHPHQWg3GDSWDWLRQ 4XDOLWg6ZLWFKLQJg9DULDQFHg>0ESVð@ pAy TîpAy 7LPHg>6HFRQGV@ A QA pAA pQA nAA nQA TAA With cache
- 13. Our conclusions! • We highlighted some issues – Throughput-‐based adaptation logics – Clients competing for bandwidth • In this paper – Buffer-‐based adaptation models – Clients metrics for oscillation detection – Oscillation compensation algorithm – Increase streaming performance – higher throughput & less quality switches • Important: client-‐centric approach – Enables scalability, maintains advantages of DASH, and is deployed! • Future work – Large-‐scale evaluations July 2, 2015 IEEE ICME 2015 13 http://www.dash-‐player.com/
- 14. Thank you for your attention ... questions, comments, etc. are welcome … Priv.-‐Doz. Dipl.-‐Ing. Dr. Christian Timmerer Associate Professor Alpen-‐Adria-‐Universität Klagenfurt, Department of Information Technology (ITEC) Universitätsstrasse 65-‐67, A-‐9020 Klagenfurt, AUSTRIA christian.timmerer@itec.uni-‐klu.ac.at http://research.timmerer.com/ Tel: +43/463/2700 3621 Fax: +43/463/2700 3699 © Copyright: Christian Timmerer 14July 2, 2015 IEEE ICME 2015
- 15. July 2, 2015IEEE ICME 2015 15 Submission deadline: November 27, 2015 http://www.mmsys.org/ | http://mmsys2016.itec.aau.at/ | @mmsys2015