Christian Sieber, Tobias Hoßfeld, Thomas Zinner, Phuoc Tran-Gia, Christian Timmerer, “Implementation and User-centric Comparison of a Novel Adaptation Logic for DASH with SVC,” In Proceedings of the IFIP/IEEE International Workshop on Quality of Experience Centric Management (QCMan), Ghent, Belgium, May 2013.

Best Paper Candidate at ICME (Top 36 out of 622 -> 5.8%)

Christopher Mueller, Stefan Lederer, Christian Timmerer, Hermann Hellwagner, “Dynamic Adaptive Streaming over HTTP/2.0”, accepted for publication in proceedings of 2013 IEEE International Conference on Multimedia and Expo (ICME 2013), San Jose, CA, USA, July 2013. (to appear)

Additional Publications at ICME

Stefan Lederer, Christopher Mueller, Benjamin Rainer, Christian Timmerer, Hermann Hellwagner, “An Experimental Analysis of Dynamic Adaptive Streaming over HTTP in Content Centric Networks”, accepted for publication in proceedings of 2013 IEEE International Conference on Multimedia and Expo (ICME 2013), San Jose, CA, USA, July 2013. (to appear)

Christopher Mueller, Stefan Lederer, Joerg Poecher, Christian Timmerer, “LIBDASH – An Open Source Software Library for the MPEG-DASH Standard, ”, accepted for publication in proceedings of 2013 IEEE International Conference on Multimedia and Expo (ICME 2013), San Jose, CA, USA, July 2013. (to appear)

Additional Publications at ICC

Stefan Lederer, Christopher Mueller, Benjamin Rainer, Christian Timmerer, and Hermann Hellwagner, Adaptive Streaming over Content Centric Networks in Mobile Networks using Multiple Links, IEEE International Workshop on Immersive & Interactive Multimedia Communications over the Future Internet, Budapest, Hungary, June, 2013. (to appear)

Yaning Liu, Joost Geurts, Jean-Charles Point, Stefan Lederer, Benjamin Rainer, Christopher Mueller, Christian Timmerer and Hermann Hellwagner, Dynamic Adaptive Streaming over CCN: A Caching and Overhead Analysis, ICC 2013, Budapest, Hungary, June, 2013. (to appear)

Additional Publications at QoMEX

Claudio Alberti, Daniele Renzi, Christian Timmerer, Christopher Mueller, Stefan Lederer, Stefano Battista and Marco Mattavelli, Automated QOE Evaluation of Dynamic Adaptive Streaming over HTTP, IEEE International Workshop on Quality of Multimedia Experience, Klagenfurt, Austria, July, 2013. (to appear)

Lederer, S., Mueller, C., Timmerer, C., Concolato, C., Le Feuvre, J., and Fliegel, K., 2013. Distributed DASH dataset. In Proceedings of the 4rd Multimedia Systems Conference (MMSys ’13). ACM, New York, NY, USA.

libdash 2.1 release is available including comprehensive documentation and a QT based graphical sample player.

New Features

• QT Sampleplayer
  

 

• Comprehensive doxygen documentation of the library
  

 

• Started the development of the libdash middleware
• Bugfixes
  • Fixed parsing MPDs with comments
  • Fixed byte range MPD bugs

Roadmap

• Next release is scheduled at the end of April
  • Extending the QT Player to support all DASH264 testvectors and audio
  • Seamless resolution switch with QT Player
  • Extending the libdash middleware
  • Further Tests & Bugfixes.

Sources and Binaries

You can find the latest sources and binaries in the download section of bitmovin and on github.

libdash was already part of ISO/IEC 23009-2, Information Technology Dynamic Adaptive Streaming over HTTP (DASH) Part 2: Conformance and Reference Software as sample client and it is now a candidate to become the MPEG-DASH reference client library.

So please provide feedback and input on the mailinglist

More information on this topic can be found on the DASH over CCN page of our website, downloads are available in our download section.

libdash is a C++ library that provides an object orient (OO) interface to the MPEG-DASH standard.

Features

• Cross platform build system based on cmake that includes Windows, Linux and Mac.
• Open source available and licensed under the LGPL.
• Implements the full MPEG-DASH standard according to ISO/IEC 23009-1, Information Technology Dynamic Adaptive Streaming over HTTP (DASH) Part 1: Media Presentation Description and Segment Formats
• Handles the download and xml parsing of the MPD. Based on that it provides an OO based interface to the MPD.
• Media elements, e.g., SegmentURL, SegmentTemplate, etc., are downloadable in that OO based structure and can be downloaded through libdash, which internally uses libcurl.
• Therefore basically all protocols that libcurl supports, e.g., HTTP, FTP, etc. are supported by libdash.
• However it also provides a configurable download interface, which enables the use of external connections that can be implemented by the user of the library for the download of media segments.
• The use of such external connections will be shown in the libdash_networkpart_test project which is part of libdash solution and also part of the cross platform cmake system and therefore usable on Windows, Linux and Mac.
• The project contains a sample multimedia player that is based on ffmpeg which uses libdash for the playback of one of our dataset MPDs.
• The development is based on Windows, therefore the code contains a VS10 solution with additional tests and the sample multimedia player.

Architecture

The general architecture of MPEG-DASH is depicted in the figure below where the orange parts are standardized, i.e., the MPD and segment formats. The delivery of the MPD, the control heuristics and the media player itself, are depicted in blue in the figure. These parts are not standardized and allow the differentiation of industry solutions due to the performance or different features that can be integrated at that level. libdash is also depicted in blue and encapsulates the MPD parsing and HTTP part, which will be handled by the library. Therefore the library provides interfaces for the DASH Streaming Control and the Media Player to access MPDs and downloadable media segments. The download order of such media segments will not be handled by the library this is left to the DASH Streaming Control, which is an own component in this architecture but it could also be included in the Media Player.

In a typical deployment, a DASH server provides segments in several bitrates and resolutions. The client initially receives the MPD through libdash which provides a convenient object orient interface to that MPD. The MPD contains the temporal relationships for the various qualities and segments. Based on that information the client can download individual media segments through libdash at any point in time. Therefore varying bandwidth conditions can be handled by switching to the corresponding quality level at segment boundaries in order to provide a smooth streaming experience. This adaptation is not part of libdash and the MPEG-DASH standard and will be left to the application which is using libdash.

Mailinglist

We offer a public accessible mailing list for discussions, questions, announcements, bug-reports, etc. around libdash. Everybody is invited to join, you can find the registration at:

libdash-dev

There are a lot of things to do! So everybody is invited to contribute, to get involved in and exited about DASH!

Roadmap

• Next release is scheduled at the end of February.
  • Doxygen Documentation.
  • Cross platform build system for the ffmpeg based sample player.
  • QT based sample player, which is cross platform buildable through cmake.
  • Further Tests & Bugfixes.
• Ongoing development during 2013
  • Implementation of a middleware for libdash.
    • Will provide buffering mechanisms and build-in adaptation logics.
    • Extends the functionality to extract, e.g., mp4, mp2ts, etc. information of the media stream.
    • Will provide further access methods which should provide a simplified interface to the library.
  • Extending the QT based sample player.
  • Testing & Bugfixing

Sources and Binaries

You can find the latest sources and binaries in the download section of bitmovin and on github.

Presentation

Acknowledgements

We specially want to thank our passionate developers at bitmovin as well as the researchers at the Institute of Information Technology(ITEC) from the Alpen Adria Universitaet Klagenfurt (AAU)!

Furthermore we want to thank the Netidee initiative from the Internet Foundation Austria for partially funding the open source development of libdash.

Authors: Christopher Mueller, Stefan Lederer and Christian Timmerer

Abstract: Multimedia streaming technologies based on the Hypertext Transfer Protocol (HTTP) are very popular and used by many content providers such as Netflix, Hulu, and Vudu. Recently, ISO/IEC MPEG has ratified Dynamic Adaptive Streaming over HTTP (DASH) which extends the traditional HTTP streaming with an adaptive component addressing the issue of varying bandwidth conditions that users are facing in networks based on the Internet Protocol (IP). Additionally, industry has already deployed several solutions based on such an approach which simplifies large scale deployment because the whole streaming logic is located at the client. However, these features may introduce drawbacks when multiple clients compete for a network bottleneck due to the fact that the clients are not aware of the network infrastructure such as proxies or other clients. This paper identifies these negative effects and the evaluation thereof using MPEG-DASH and Microsoft Smooth Streaming. Furthermore, we propose a novel adaptation algorithm introducing the concept of fairness regarding a cluster of clients. In anticipation of the results we can conclude that we achieve more efficient bottleneck bandwidth utilization and less quality switches.

Conference: VCIP2012, San Diego, CA, USA, Nov 27-30, 2012

DASH-JS is a seamless integration of Dynamic Adaptive Streaming over HTTP (DASH) into the Web using the HTML5 video element. Moreover, it is based on JavaScript which uses the Media Source API of Google’s Chrome browser to present a flexible and potentially browser independent DASH player. A more detailed description as well as showcases are available here on our website.

Presenters: Christian Timmerer and Carsten Griwodz

Abstract: In this tutorial we present dynamic adaptive streaming over HTTP ranging from content creation to consumption. It particular, it provides an overview of the recently ratified MPEG-DASH standard, how to create content to be delivered using DASH, its consumption, and the evaluation thereof with respect to competing industry solutions. The tutorial can be roughly clustered into three parts. In part I we will provide an introduction to DASH, part II covers content creation, delivery, and consumption, and, finally, part III deals with the evaluation of existing (open source) MPEG-DASH implementations compared to state-of-art deployed industry solutions.

Acknowledgment: FP7 ICT SocialSensor, FP7 ICT ALICANTE