[13] | Christian Timmerer, The Future of Multimedia on the Internet, In Computing Now, IEEE Computer Society [online], Los Alamitos, CA, USA, pp. 1, 2016.
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[12] | Christian Timmerer, Daniel Weinberger, Martin Smole, Reinhard Grandl, Christopher Mueller, Stefan Lederer, Live Transcoding and Streaming-as-a-Service with Low Delay and High QoE, In 2016 NAB Broadcast Engineering Conference Proceedings & CD (not available, ed.), National Association of Broadcasters (NAB), Washington DC, USA, pp. 4, 2016.
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[11] | Cedric Westphal, Tommaso Melodia, Wenww Zhu, Christian Timmerer, Guest Editorial Video Distribution Over Future Internet, In IEEE Journal on Selected Areas in Communications, IEEE Communications Society, vol. 34, no. 8, New York, pp. 2061-2062, 2016.
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[10] | Cedric Westphal, Stefan Lederer, Daniel Posch, Christian Timmerer, Aytac Azgin, Will Shucheng Liu, Christopher Müller, Andrea Detti, Daniel Corujo, Jianping Wang, Marie-Jose Montpetit, Niall Murray, Adaptive Video Streaming over Information-Centric Networking (ICN) -- RFC 7933, Technical report, Internet Engineering Task Force, 5177 Brandin Court Fremont, California 94538 USA, pp. 40, 2016.
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[9] | Christian Timmerer, Matteo Maiero, Benjamin Rainer, Which Adaptation Logic? An Objective and Subjective Performance Evaluation of HTTP-based Adaptive Media Streaming Systems, In arXiv.org [cs.MM], N.N., vol. abs/1606.00341, N.N., pp. 11, 2016.
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[8] | Christian Timmerer, Alan Bertoni, Advanced Transport Options for the Dynamic Adaptive Streaming over HTTP, In arXiv.org [cs.MM], N.N., vol. abs/1606.00264, N.N., pp. 6, 2016.
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[7] | Christian Timmerer, Daniel Weinberger, Martin Smole, Reinhard Grandl, Christopher Mueller, Stefan Lederer, Transcoding and Streaming-as-a-Service for improved Video Quality on the Web, In Proceedings of the 7th International Conference on Multimedia Systems (Christian Timmerer, Ali Begen, eds.), ACM, New York, pp. 37:1-37:3, 2016.
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[6] | Benjamin Rainer, Daniel Posch, Andreas Leibetseder, Sebastian Theuermann, Hermann Hellwagner, A Low-Cost NDN Testbed on Banana Pi Routers, In Communications Magazine, IEEE, IEEE, vol. 54, no. 9, New York, USA, pp. 6, 2016. (IEEE COMMAG Network Testing and Analytics Series)
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Abstract: The computer communication research community shows significant interest in the paradigm of Information-Centric Networking (ICN). Continuously, new proposals for ICN-related challenges (caching, forwarding, etc.) are published. However, due to a lack of a readily available testbed, the majority of these proposals is evaluated either by theoretical analysis and/or by conducting network simulations potentially masking further challenges that are not observable in synthetic environments. Therefore, this article presents a framework for an ICN testbed using low-budget physical hardware with little deployment and maintenance effort for the individual researcher; specifically, Named Data Networking is considered. The employed hardware and software are powerful enough for most research projects, but extremely resource intensive tasks may push both components towards their limits. The testbed framework is based on well established open source software and provides the tools to readily investigate important ICN characteristics on physical hardware emulating arbitrary network topologies. The article discusses the testbed architecture and provides first results obtained from emulations that investigate the performance of various forwarding strategies. The results indicate that further challenges have to be overcome when heading towards a real-world deployment of ICN-based communication.
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[5] | Benjamin Rainer, Daniel Posch, Hermann Hellwagner, Investigating the Performance of Pull-based Dynamic Adaptive Streaming in NDN, In Journal on Selected Areas in Communications, IEEE, vol. 34, no. 8, New York, USA, pp. 11, 2016. (IEEE JSAC Special Issue on Video Distribution over Future Internet)
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Abstract: Adaptive content delivery is the state-of-the-art in real-time multimedia streaming. Leading streaming approaches, e.g., MPEG-DASH and Apple HLS, have been developed for classical IP-based networks, providing effective streaming by means of pure client-based control and adaptation. However, the research activities of the Future Internet community adopt a new course that is different from today's host-based communication model. So-called Information-Centric Networks are of considerable interest and are advertised as enablers for intelligent networks, where effective content delivery is to be provided as an inherent network feature. This paper investigates the performance gap between pure client-driven adaptation and the theoretical optimum in the promising Future Internet architecture Named Data Networking (NDN). The theoretical optimum is derived by modeling multimedia streaming in NDN as a fractional Multi-Commodity Flow Problem and by extending it taking caching into account. We investigate the multimedia streaming performance under different forwarding strategies, exposing the interplay of forwarding strategies and adaptation mechanisms. Furthermore, we examine the influence of network inherent caching on the streaming performance by varying the caching polices and the cache sizes.
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[4] | Daniel Posch, Towards Effective Multimedia Dissemination in Information-Centric Networks, PhD thesis, Alpen-Adria Universität Klagenfurt, pp. 210, 2016.
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Abstract: Real-time entertainment (mainly audio/video streaming) is responsible for the largest traffic share in today's networks. Social and entertainment platforms such as YouTube, Netflix and Facebook provide a tremendous amount of multimedia content to their global customers via the Internet. With the ever growing popularity of these services, the Internet is struggling to suffice the continuously increasing requirements demanded by applications. In particular, the demands go far beyond the intent of the Internet's original design. Architectural and legacy design choices lead to issues, the solutions to which are neither efficient nor elegant. One approach to tackle these challenges is Information-Centric Networking (ICN), a new concept for today's Internet. The idea is to base the network's principal communication model on the most important item, namely the content to be transferred. This novel concept provides significant opportunities to enhance networking. In this thesis we investigate how ICN can be used as an enabler for effective multimedia dissemination. As a first step we analyse the technology's characteristic capabilities and their potential benefits for content distribution in future networks. We develop an analytical model taking account of the main building blocks (network-inherent caching, multi-path forwarding) and compare the obtained upper bound to the current state of ICN considering the scenario of pull-based adaptive multimedia streaming. The results show that there exists a significant gap between the promised and the realized performance, largely caused by ineffective Interest forwarding strategies. Therefore, we design and implement a novel probability-based forwarding strategy named Stochastic Adaptive Forwarding (SAF), which provides effective multi-path forwarding, identifies unknown cached content replicas and deals with local topology changes without guidance from the routing plane. The results indicate that SAF brings ICN one step closer towards effective content distribution. In particular, we show that it is important to consider context information in the forwarding plane. This includes content characteristics and application demands. SAF is the first strategy that takes account of context information that can be supplied by the network operators. Furthermore, this work provides a framework for a testbed that can be used by researchers to readily deploy an ICN-based testbed. This allows researchers to conduct experiments on physical hardware providing deeper insights on proposed algorithms than network simulations or analytical methods could ever do. We use the testbed to validate our results concerning multimedia delivery in ICN, and conduct network emulations investigating the performance of SAF and its competitors. Furthermore, we compare the results of network emulations to the findings obtained from simulations to assess their validity. Both simulations and emulations show that our SAF approach provides a significant step towards effective multimedia content distribution in ICN.
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[3] | Daniel Posch, Benjamin Rainer, Sebastian Theuermann, Andreas Leibetseder, Hermann Hellwagner, Emulating NDN-based Multimedia Delivery, In Proceedings of the 7th International Conference on Multimedia Systems (Christian Timmerer, Ali Begen, eds.), ACM Digital Library, New York, pp. 4, 2016.
[bib][url] [doi] [pdf] [abstract]
Abstract: Today, the global share and increase of Internet traffic is largely caused by multimedia delivery, mainly encompassing video, audio and image sharing on social, news, and entertainment platforms. This fact is well known to the Internet research community, which tries to counteract by increasing the content delivery efficiency. So-called Information-Centric Networks (ICN) are of considerable interest, advertised as enablers for intelligent networks, where effective delivery is to be provided as an inherent network feature. Most research proposals in this area are evaluated in simulated environments, using simulation frameworks such as OMNeT++ or ns-3. However, simulations always have shortcomings and cannot substitute measurements in physical networks. In this demonstration, we show how to readily set up an ICN-based testbed using low-budget single-board computers to conduct comprehensive emulations. We choose the scenario of pull-based adaptive video delivery as a showcase and evaluate the performance of different client-based adaptation mechanisms at the application level and different content forwarding strategies at the network level. All of the presented tools and visualization features are provided as open source contributions to the community.
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[2] | Christian Kreuzberger, Benjamin Rainer, Hermann Hellwagner, Laura Toni, Pascal Frossard, A Comparative Study of DASH Representation Sets Using Real User Characteristics, In Proceedings of the 26th International Workshop on Network and Operating Systems Support for Digital Audio and Video (ACM, ed.), ACM, New York, NY, USA, pp. 4:1-4:6, 2016.
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[1] | Darragh Egan, Sean Brennan, John Barret, Yuansong Qiao, Christian Timmerer, Niall Murray, An evaluation of Heart Rate and ElectroDermal Activity as an objective QoE evaluation method for immersive virtual reality environments, In 2016 Eighth International Conference on Quality of Multimedia Experience (QoMEX) (Fernando Pereira, Klaus Diepold, Paula Queluz, Ulrich Reiter, eds.), IEEE Signal Processing Society, Lisboa, Portugal, pp. 1-6, 2016.
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