1 / 8 Network Characteristics of Video Streaming Traffic Ashwin Rao, Yeon-sup Lim, Chadi Barakat, Arnaud Legout, Don Towsley, and Walid Dabbous INRIA Project Planete Sophia Antipolis Univ. of Massachusetts Amherst

2 / 8 Video Streaming in the Internet 20% to 40 % of Internet Traffic Adobe Flash HTML5Microsoft Silverlight Containers Desktop BrowsersMobile Applications Internet Explorer FirefoxChromeiOS (native) Android (native) What are the Network Characteristics of Video Streaming Traffic ?

3 / 8 Generic Behavior of Video Streaming Download Amount Time Buffering Block Size On Off Steady State Average rate during steady state

4 / 8 Streaming Strategies Identified No On Off CyclesLong On Off CyclesShort On Off Cycles OFF

5 / 8 Streaming Strategies Used ServiceYouTubeNetflix ContainerFlashHTML5Silverlight IE 9Short FirefoxShortNoShort ChromeShortLongShort iOS (native) -Based on encoding rate Short Android (native) -Long Streaming strategy depends on type of application and container

6 / 8 Streaming Strategies Comparison No On OffLong On OffShort On Off Engineering Complexity No Complex Engineering Explicit support on server or client side TCP FriendlyYes – TCP File Transfer Yes – periodic File Transfer Unknown traffic not ack- clocked Receive buffer occupancy LargeModerateSmall Unused bytes on user interruptions Large amount Moderate amount Small amount Strategy Metric

7 / 8 Open Questions for the CCN community Should CCN nodes be aware of the underlying streaming strategy? What is the optimal streaming strategy for CCN? Is there an optimal caching strategy for a given streaming strategy? What is the impact of user interruptions due to lack of interest on CCN caches?

8 / 8 THANK YOU

9 / 8 BACKUPS

10 / 8 YouTube Streaming Strategies ContainerFlashHTML5 ApplicationAny Web Browser IE 9FirefoxGoogle Chrome iOS (native) Android (native) StrategyShort NoLongDependsLong Buffering Amount 40 sUp to 15 MB Video Size Up to 15 MB 40 s of playback or up to 20 MB Up to 10 MB Block Size64 kB256 kB NA5 MB to 8 MB 64 kB2 MB to 8 MB

11 / 8 Open Questions for CCN community Should CCN nodes be aware of the underlying streaming strategy? What is the optimal streaming strategy for CCN? Is there an optimal caching strategy for a given streaming strategy? What is the impact of user interruptions due to lack of interest?

12 / 8 Netflix Streaming Strategies ContainerSilverlightSilverlight for Mobile Devices? ApplicationAny Web Browser iOS (native)Android (native) StrategyShort Long Buffering Amount 30 MB to 150 MB 10 to 20 MB35 to 45 MB Block Size0.5 MB to 2 MB 0.5 to 3 MB4.5 to 6 MB

13 / 8 Data Set and Locations YouTubeNetFlix DesktopMobileDesktopMobile 5000 Flash, 3000 HTML5, 2000 HD Sites in France and 2 Sites in USA

14 / 8 Conclusions Streaming Strategy depends on browser and container Migration from one strategy to another can have a non- negligible impact Raw File Transfer vs Periodic Buffering vs No ack-clock

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