Distributed DASH Dataset

Stefan Lederer, Christopher Müller, Christian Timmerer,Cyril Concolato, Jean Le Feuvre, and Karel Fliegel

Alpen-Adria-Universität Klagenfurt (AAU) Faculty of Technical Sciences (TEWI) Department of Information Technology (ITEC) Multimedia Communication (MMC) Sensory Experience Lab (SELab)

http://research.timmerer.com http://blog.timmerer.com http://dash.itec.aau.at/mailto:christian.timmerer@itec.uni-klu.ac.at

ACM Multimedia Systems28th February, 2013

Acknowledgments. This work was supported in part by the EC in the context of the ALICANTE (FP7-ICT-248652) and SocialSensor (FP7-ICT- 287975) projects and partly performed in the Lakeside Labs research cluster at AAU. Special thanks to the Red Bull Media House for providing us the Red Bull Playstreets video. They own the rights of the content but the usage for scientific purposes is permitted. This work was also supported in part by the French-funded project AUSTRAL (DGCIS FUI13). This work was partially supported by the COST IC1003 QUALINET, by the Czech-funded project COST CZ LD12018 MOVERIQ and by the grant of the Czech Science Foundation No. P102/10/1320.

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What is DASH?

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http://en.wikipedia.org/wiki/Dash_(disambiguation)

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Dynamic Adaptive Streaming over HTTP

• In a nutshell …

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Christian Timmerer and Carsten Griwodz. 2012. Dynamic adaptive streaming over HTTP: from content creation to consumption. In Proceedings of the 20th ACM international conference on Multimedia (MM '12). ACM, New York, NY, USA, 1533-1534. DOI=10.1145/2393347.2396553 http://doi.acm.org/10.1145/2393347.2396553

http://www.slideshare.net/christian.timmerer/dynamic-adaptive-streaming-over-http-from-content-creation-to-consumption

Adaptation logic is within the client, not normatively specified

by the standard, subject to research and development

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Why a (distributed) DASH dataset?• … to enable an objective comparison of evaluation results across different

client implementations– E.g.: MMSys dataset track, QUALINET database

• Why distributed?– DASH allows to pull segments from multiple sources/sites– Signaled through multiple BaseURL elements within the XML-based

Media Presentation Description (MPD)– Allows for a real-world evaluation of DASH clients that perform bitstream switching

between multiple sites– E.g., to simulate switching between multiple Content Distribution Networks (CDNs)

• Additionally, we provide a mechanism to mirror the DASH content to further sites– Join this activity, everyone is invited – get involved in and exited about DASH!

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Lederer, S., Mueller, C., and Timmerer, C. 2012. Dynamic adaptive streaming over HTTP dataset. In Proceedings of the 3rd Multimedia Systems Conference (MMSys '12). ACM, New York, NY, USA, 89-94. DOI=http://doi.acm.org/10.1145/2155555.2155570

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DASH and multiple BaseURLs• BaseURL

– URL indicating a location that can be used to request the different segments needed for the presentation

– Optional element, can be present multiple times at multiple levels in the XML hierarchy of the MPD

– Optional attributes: serviceLocation and byteRange

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Main repository and distribution

• Available at http://dash.itec.aau.at | http://bit.ly/d-dash • RedBull Playstreet sequence, 1h 37min 28sec

– Segment length: 2, 4, 6, 10, 15sec– 17 different video representations: [100kbps at 320x240, 6 Mbps at

1920x1080]– 4 different audio representations: two channels at 64, 96, 128, and

165 kbps using a 48 kHz sampling rate

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Add your site to the D-DASH dataset

• Create a mirror of the dataset:– Copy the dataset to your server and provide HTTP-access to it. The dataset has a size of

approx. 85 GB and can be downloaded from our servers:FTP: ftp://ftp-itec.uni-klu.ac.at/pub/datasets/mmsys13/HTTP: http://www-itec.uni-klu.ac.at/ftp/datasets/mmsys13/

– It is recommended to create a job, e.g., via wget, to keep the mirror up-to-date and the get latest MPDs also on your site. This can be done via the the following command line:

wget -m -nH –cut-dirs=3 ftp://ftp-itec.uni-klu.ac.at/pub/datasets/mmsys13/• Register the mirror of the dataset:

– Please register your site so that we can validate your dataset copy and add your site to the MPDs of the dataset

– Please use our registration form at:http://www-itec.uni-klu.ac.at/dash/ddash/register.html

• You are part of D-DASH!– After the registration we check your dataset mirror and you will be notified by us. Your

site will be added to the MPDs in our dataset repository and mirrored to all other sites.– Furthermore your site will be integrated in our MPD-generation service

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MPD update process

Method 1• MPDs of the dataset are updated in the main repository

– If new mirrors have been added and verified– If an existing mirror gets inactive

• These MPDs are replicated but its the responsibility of the site owners

Method 2• MPD generation service (PHP script) which provides the most

up-to-date MPDs based on our mirror database– http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?

segmentlength={2, 4, 6, 10, 15}&type={full, URLTemplate}Feb 28, 2013

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What can you do with this dataset?• Work on a paper! E.g., for QoMEX’13 (submission deadline Mar.

6/20), JSAC Special Issue (Apr. 1), PV’13 (June), or MMSys’14 (Sep. 16)

• Bootstrap problem– When retrieving an MPD with multiple BaseURLs, with which BaseURL

to start a DASH session?– Finding the “best” BaseURL to use may influence the start-up delay and,

thus, Quality of Experience• Bandwidth fluctuations during a DASH session

– Switch to another BaseURL (which one?) or select another representation within the same BaseURL

• Live streaming with multiple BaseURL – well, that’s another story!• You may use “Commute Path Bandwidth Traces from 3G

Networks: Analysis and Applications” from Riiser et al.Feb 28, 2013

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Conclusions

• Major critical issue for DASH implementations– Bandwidth estimations for segments @ multiple BaseURLs in

parallel– Subject to low start-up delay and smooth streaming without

stalls or re-buffering• Our distributed DASH dataset allows for a real-world

evaluation of DASH clients that perform bitstream switching between multiple sites

• Current sites: Klagenfurt (Austria), Paris (France), Prague (Czech Republic)

• It can be easily distributed further, e.g., outside EuropeFeb 28, 2013

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Guest Editors • Christian Timmerer, Alpen-Adria-Universität Klagenfurt, Austria• Ali C. Begen, CISCO, Canada• Thomas Stockhammer, QUALCOMM, USA • Carsten Griwodz, Simula Research Laboratory, Norway • Bernd Girod, Stanford University, USA

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http://multimediacommunication.blogspot.no/2012/07/jsac-special-issue-adaptive-media.html

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Thank you for your attention

... questions, comments, etc. are welcome …

Ass.-Prof. Dipl.-Ing. Dr. Christian TimmererKlagenfurt University, Department of Information Technology (ITEC)

Universitätsstrasse 65-67, A-9020 Klagenfurt, AUSTRIAchristian.timmerer@itec.uni-klu.ac.at

http://research.timmerer.com/Tel: +43/463/2700 3621 Fax: +43/463/2700 3699

© Copyright: Christian Timmerer

Feb 28, 2013