% Categories: MMC & Year: 2015
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@Article{timmerer2015_computer,
  author = {Timmerer, Christian and Ebrahimi, Touradj and Pereira, Fernando},
  journal = {IEEE Computer},
  title = {Toward a New Assessment of Quality},
  year = {2015},
  issn = {0018-9162},
  month = {mar},
  number = {3},
  pages = {108-110},
  volume = {48},
  abstract = {A convergence of trends is shifting the focus of quality assessment from compliance with system design goals to fulfillment of user needs or expectations in different contexts.},
  address = {Los Alamitos, CA, USA},
  keywords = {Quality of Experience, Quality of Sensory Experience, Quality of Life},
  language = {EN},
  pdf = {https://www.itec.aau.at/bib/files/07063175.pdf},
  publisher = {IEEE Computer Society}
}
@InProceedings{Xu2015,
  author = {Xu, He and Pereira, Fernando and Timmerer, Christian and Ebrahimi, Touradj},
  booktitle = {Proceedings of 2015 European Conference on Networks and Communications (EUCNC)},
  title = {Towards Quality of Sensory Experience in Multimedia},
  year = {2015},
  address = {Brussels, Belgium},
  editor = {Demassieux, Nicolas and Campolargo, Mario},
  month = {jun},
  pages = {627-628},
  publisher = {IEEE},
  language = {EN},
  pdf = {https://www.itec.aau.at/bib/files/1570129963.pdf},
  talktype = {none}
}
@InProceedings{Timmerer2015_ICME,
  author = {Timmerer, Christian and Weinberger, Daniel and Smole, Martin and Grandl, Reinhard and Mueller, Christopher and Lederer, Stefan},
  booktitle = {2015 IEEE International Conference on Multimedia \& Expo Workshops (ICMEW)},
  title = {Live Transcoding and Streaming-as-a-Service with MPEG-DASH},
  year = {2015},
  address = {Los Alamitos, CA},
  editor = {Magli, Enrico and Tubaro, Stefano and Vetro, Anthony},
  month = {jun},
  pages = {1-4},
  publisher = {IEEE},
  abstract = {Multimedia content delivery and real-time streaming over the top of the existing infrastructure is nowadays part and parcel of every media ecosystem thanks to open standards and the adoption of the Hypertext Transfer Protocol (HTTP) as its primary mean for transportation. Hardware encoder manufacturers have adopted their product lines to support the dynamic adaptive streaming over HTTP but suffer from the inflexibility to provide scalability on demand, specifically for event-based live services that are only offered for a limited period of time. The cloud computing paradigm allows for this kind of flexibility and provide the necessary elasticity in order to easily scale with the demand required for such use case scenarios. In this paper we describe bitcodin, our transcoding and streaming-as-as-ervice platform based on open standards (i.e., MPEG-DASH) which is deployed on standard cloud and content delivery infrastructures to enable high-quality streaming to heterogeneous clients. It is currently deployed for video on demand, 24/7 live, and event-based live services using bitdash, our adaptive client framework.},
  language = {EN},
  location = {Torino, Italy},
  pdf = {https://www.itec.aau.at/bib/files/icme2015-bitmovin_camera-ready.pdf},
  talkdate = {2015.06.30},
  talktype = {poster}
}
@Article{Timmerer2015_ELetterNov,
  author = {Timmerer, Christian and Weinberger, Daniel and Smole, Martin and Grandl, Reinhard and Mueller, Christopher and Lederer, Stefan},
  journal = {IEEE Multimedia Communications Technical Committee E-Letter},
  title = {Cloud-based Transcoding and Adaptive Video Streaming-as-a-Service},
  year = {2015},
  month = {nov},
  pages = {7--11},
  address = {New York, NY, USA},
  language = {EN},
  pdf = {https://www.itec.aau.at/bib/files/MMTC_bitcodin+bitdash.pdf},
  publisher = {IEEE Communications Society [online]}
}
@Article{Timmerer2015_ELetter,
  author = {Timmerer, Christian and Maiero, Matteo and Rainer, Benjamin and Petscharnig, Stefan and Weinberger, Daniel and Mueller, Christopher and Lederer, Stefan},
  journal = {IEEE Multimedia Communications Technical Committee E-Letter},
  title = {Quality of Experience of Adaptive HTTP Streaming in Real-World Environments},
  year = {2015},
  month = {may},
  pages = {6-9},
  address = {New York, NY, USA},
  language = {EN},
  pdf = {https://www.itec.aau.at/bib/files/QoE-DASH.pdf},
  publisher = {IEEE Communications Society [online]},
  talktype = {registered}
}
@Article{Rainer2015_MNA,
  author = {Rass, Stefan and Rainer, Benjamin and Vavti, Matthias and Göllner, Johannes and Peer, Andreas and Schauer, Stefan},
  journal = {Mobile Networks and Applications},
  title = {Secure Communication over Software-Defined Networks},
  year = {2015},
  month = {jan},
  pages = {105--110},
  address = {Springer US},
  language = {EN},
  publisher = {Springer},
  talktype = {none}
}
@InProceedings{Rainer2015_MMSysDemo,
  author = {Rainer, Benjamin and Petscharnig, Stefan and Timmerer, Christian},
  booktitle = {Proceedings of the 6th ACM International Conference on Multimedia Systems},
  title = {Merge And Forward - Self-organized Inter-Destination Multimedia Synchronization},
  year = {2015},
  address = {New York, U.S.A},
  editor = {not, available},
  month = {mar},
  pages = {77-80},
  publisher = {ACM International Conference on Multimedia Systems},
  abstract = {Social networks have become ubiquitous and with these new possible ways for social communication and experiencing multimedia together the traditional TV scenario drifts more and more towards a distributed social experience. Asynchronism in the multimedia playback of the users may have a significant impact on the acceptability of systems providing the distributed multimedia experience. The synchronization needed in such systems is called Inter-Destination Multimedia Synchronization. In this paper we propose a demo that implements IDMS by the means of our self-organized and distributed approach assisted by pull-based streaming. We also provide a video of the planned demonstration and provide the mobile application as open source licensed under the GNU LGPL.},
  language = {EN},
  location = {Portland, Oregon},
  talkdate = {2015.03.18},
  talktype = {poster}
}
@InProceedings{Rain1502:IDMSQoMEX,
  author = {Rainer, Benjamin and Petscharnig, Stefan and Timmerer, Christian and Hellwagner, Hermann},
  booktitle = {Seventh International Workshop on Quality of Multimedia Experience (QoMEX 2015)},
  title = {Is One Second Enough? - Evaluating QoE for Inter-Destination Multimedia Synchronization using Human Computation and Crowdsourcing},
  year = {2015},
  address = {Greece, Messinia},
  editor = {Skodras, Athanassios},
  month = {may},
  pages = {1-6},
  publisher = {IEEE},
  abstract = {Modern-age technology enables us to consume multimedia for enjoyment and as a social experience. The traditional way to consume multimedia together (e.g., with family or friends in the living room) is being superseded by a location-independent scenario where geographically distributed users consume the same content while having a real-time communication channel among each other. Inter-Destination Multimedia Synchronization (IDMS) is the tool of choice in order to enable users a high-quality multimedia experience. In this paper, we investigate the influence of asynchronism when consuming multimedia content together while being geographically distributed. In particular, we adopt the concept of human computation and developed a reaction game which we used to conduct a crowdsourced subjective quality assessment in order to evaluate a threshold for multimedia synchronization within an IDMS scenario. Our results show a significant decrease in overall Quality of Experience (QOE) at an asynchronism level of 750ms. At the same time, we were able to show that asynchronism at a level of 400ms does not have significant differences regarding the QoE when compared to the synchronous reference case.},
  language = {EN},
  location = {Greece, Messinia, Costa Navarino},
  pdf = {https://www.itec.aau.at/bib/files/07148107.pdf},
  talkdate = {2015.05.27},
  talktype = {registered}
}
@InProceedings{Raffelsberger2015,
  author = {Raffelsberger, Christian and Hellwagner, Hermann},
  booktitle = {Proceedings of the 13th IEEE International Conference on Pervasive Computing and Communications Workshops ({PerCom Workshops '15})},
  title = {A Multimedia Delivery System for Delay-/Disruption-Tolerant Networks},
  year = {2015},
  address = {Los Alamitos, CA, USA},
  editor = {Hurson, Ali and Das, Sajal K},
  month = {mar},
  pages = {530-536},
  publisher = {IEEE},
  abstract = {Multimedia delivery systems and protocols usually assume end-to-end connections and low delivery delays between multimedia sources and consumers. However, neither of these two properties can always be achieved in hastily formed networks for emergency response operations. In particular, disruptions may break end-to-end connections, which makes it impossible to deliver multimedia content instantly. This work presents a multimedia delivery system that can operate in disrupted networks and hence may help improve the situational awareness in emergency response operations. The multimedia delivery system is based on HTTP adaptive streaming (HAS) and uses a modified version of HTTP which is able to deliver data in partitioned networks. The multimedia delivery system is evaluated in a realistic emergency response scenario.},
  doi = {10.1109/PERCOMW.2015.7134093},
  isbn10 = {978-1-4799-8425-1},
  language = {EN},
  location = {Saint Louis, MO, USA},
  pdf = {https://www.itec.aau.at/bib/files/CR-PerNEM15.pdf},
  talkdate = {2015.03.27},
  talktype = {registered}
}
@Article{Pohl2015b,
  author = {Pohl, Daniela and Bouchachia, Abdelhamid and Hellwagner, Hermann},
  journal = {Neurocomputing},
  title = {Online Indexing and Clustering of Social Media Data for Emergency Management},
  year = {2015},
  month = {jan},
  pages = {168-179},
  abstract = {Social media becomes a vital part in our daily communication practice, creating a huge amount of data and covering different real-world situations. Currently, there is a tendency in making use of social media during emergency management and response. Most of this effort is performed by a huge number of volunteers browsing through social media data and preparing maps that can be used by professional first responders. Automatic analysis approaches are needed to directly support the response teams in monitoring and also understanding the evolution of facts in social media during an emergency situation. In this paper, we investigate the problem of real-time sub-events identification in social media data (i.e., Twitter, Flickr and YouTube) during emergencies. A processing framework is presented serving to generate situational reports/summaries from social media data. This framework relies in particular on online indexing and online clustering of media data streams. Online indexing aims at tracking the relevant vocabulary to capture the evolution of sub-events over time. Online clustering, on the other hand, is used to detect and update the set of sub-events using the indices built during online indexing. To evaluate the framework, social media data related to Hurricane Sandy 2012 was collected and used in a series of experiments. In particular some online indexing methods have been tested against a proposed method to show their suitability. Moreover, the quality of online clustering has been studied using standard clustering indices. Overall the framework provides a great opportunity for supporting emergency responders as demonstrated in real-world emergency exercises.},
  address = {Amsterdam, Netherlands},
  doi = {10.1016/j.neucom.2015.01.084},
  language = {EN},
  publisher = {Elsevier}
}
@InCollection{Pohl2015a,
  author = {Pohl, Daniela and Bouchachia, Abdelhamid},
  booktitle = {Propagation Phenomena in Real World Networks},
  publisher = {Springer London},
  title = {Information Propagation in Social Networks during Crises: A Structural Framework},
  year = {2015},
  address = {London, UK},
  editor = {Krol, Dariusz and Fay, Damien and Gabrys, Bogdan},
  month = {mar},
  pages = {293-309},
  series = {Intelligent Systems Reference Library},
  abstract = {In crisis situations like riots, earthquakes, storms, etc. information plays a central role in the process of organizing interventions and decision making. Due to their increasing use during crises, social media (SM) represents a valuable source of information that could help obtain a full picture of people needs and concerns. In this chapter, we highlight the importance of SM networks in crisis management (CM) to show how information is propagated through. The chapter also summarizes the current state of research related to information propagation in SM networks during crises. In particular three classes of information propagation research categories are identified: network analysis and community detection, role and topic-oriented information propagation, and infrastructure-oriented information propagation. The chapter describes an analysis framework that deals with structural information propagation for crisis management purposes. Structural propagation is about broadcasting specific information obtained from social media networks to targeted sinks/receivers/hubs like emergency agencies, police department, fire department, etc. Specifically, the framework aims to identify the discussion topics, known as sub-events , related to a crisis (event) from SM contents. A brief description of techniques used to detect topics and the way those topics can be used in structural information propagation are presented.},
  doi = {10.1007/978-3-319-15916-4_12},
  isbn10 = {978-3-319-15915-7},
  language = {EN}
}
@InProceedings{Mueller2015_ICME,
  author = {Mueller, Christopher and Lederer, Stefan and Grandl, Reinhard and Timmerer, Christian},
  booktitle = {Proceedings of 2015 IEEE International Conference on Multimedia and Expo (ICME)},
  title = {Oscillation Compensating Dynamic Adaptive Streaming over HTTP},
  year = {2015},
  address = {Los Alamitos, CA},
  editor = {Magli, Enrico and Tubaro, Stefano and Vetro, Anthony},
  month = {jul},
  pages = {1-6},
  publisher = {IEEE},
  abstract = {Streaming multimedia over the Internet is omnipresent but still in its infancy, specifically when it comes to the adaptation based on bandwidth/throughput measurements, clients competing for limited/shared bandwidth, and the presence of a caching infrastructure. In this paper we present a buffer-based adaptation logic in combination with a toolset of client metrics to compensate for erroneous adaptation decisions. These erroneous adaptation decisions are due to insufficient network information available at the client and issues introduced when multiple clients compete for limited/shared bandwidth and/or when caches are deployed. Our metrics enable the detection of oscillations on the client - in contrast to server-based approaches - and provide an effective compensation mechanism. We evaluate the proposed adaptation logic, which incorporates the oscillation detection and compensation method, and compare it against a throughput-based adaptation logic for scenarios comprising competing clients with and without caching enabled. In anticipation of the results, we show how the presented metrics detect oscillation periods and how such undesirable situations can be compensated while increasing the effective media throughput of the clients.},
  doi = {10.1109/ICME.2015.7177435},
  language = {EN},
  location = {Torino, Italy},
  pdf = {https://www.itec.aau.at/bib/files/icme2015paper.pdf},
  talkdate = {2015.07.02},
  talktype = {registered}
}
@InProceedings{Kreuzberger2015b,
  author = {Kreuzberger, Christian and Rainer, Benjamin and Hellwagner, Hermann},
  booktitle = {IEEE International Conference on Multimedia Expo Workshops},
  title = {Modelling the Impact of Caching and Popularity on Concurrent Adaptive Multimedia Streams in Information-Centric Networks},
  year = {2015},
  address = {Los Alamitos, CA, USA},
  editor = {Matteo, Cesana},
  month = {jul},
  pages = {1--6},
  publisher = {IEEE},
  series = {ICMEW '15},
  abstract = {The Internet is nowadays mainly used for streaming of multimedia content, something it was not built for originally. To guarantee user satisfaction, one of the key concepts of the Internet as we know it is bandwidth sharing. While this concept is necessary to provide stability in the network, several issues can arise with adaptive multimedia streaming, e.g., efficiency and stability. Considering Information-Centric Networking (ICN) and its network-inherent caching, those issues tend to become worse. Many researchers have proposed to use traffic shaping on the server to enable fair bandwidth sharing and stabilize clients. However, existing research does not consider content popularity and in-network caching. The contribution of this paper is two-fold. First, we propose a cache-aware traffic shaping policy, in order to guarantee seamless playback of videos. Second, based on content popularity, we calculate an average video quality achieved by this traffic shaping policy for various cache sizes, to show the impact of popularity and caching for multimedia streaming in ICN.},
  doi = {10.1109/ICMEW.2015.7169763},
  keywords = {Content Popularity; Adaptive Multimedia Streaming; Information-Centric Networking; Traffic Shaping},
  language = {EN},
  location = {Torino, Italy},
  pdf = {https://www.itec.aau.at/bib/files/music_modelling_streaming_revision1_v3.pdf},
  talkdate = {2015.07.03},
  talktype = {registered}
}
@InProceedings{Kreuzberger2015a,
  author = {Kreuzberger, Christian and Posch, Daniel and Hellwagner, Hermann},
  booktitle = {Proceedings of the 6th ACM Multimedia Systems Conference},
  title = {A Scalable Video Coding Dataset and Toolchain for Dynamic Adaptive Streaming over HTTP},
  year = {2015},
  address = {New York, NY, USA},
  editor = {Wei, Tsang Ooi},
  month = {mar},
  pages = {213--218},
  publisher = {ACM},
  series = {MMSys '15},
  abstract = {With video streaming becoming more and more popular, the number of devices that are capable of streaming videos over the Internet is growing. This leads to a heterogeneous device landscape with varying demands. Dynamic Adaptive Streaming over HTTP (DASH) offers an elegant solution to these demands. Smart adaptation logics are able to adjust the clients' streaming quality according to several (local) parameters. Recent research indicated benefits of blending Scalable Video Coding (SVC) with DASH, especially considering Future Internet architectures. However, except for a DASH dataset with a single SVC encoded video, no other datasets are publicly available. The contribution of this paper is two-fold. First, a DASH/SVC dataset, containing multiple videos at varying bitrates and spatial resolutions including 1080p, is presented. Second, a toolchain for multiplexing SVC encoded videos is provided, therefore making our results reproducible and allowing researchers to generate their own datasets.},
  doi = {10.1145/2713168.2713193},
  isbn13 = {978-1-4503-3351-1},
  keywords = {DASH; Dataset; Toolchain; Scalable Video Coding},
  language = {EN},
  location = {Portland, Oregon},
  pdf = {https://www.itec.aau.at/bib/files/dash_svc_dataset_v1.05.pdf},
  talkdate = {2015.03.18},
  talktype = {registered},
  url = {http://concert.itec.aau.at/SVCDataset/}
}
@InProceedings{HH2015a,
  author = {Hellwagner, Hermann and Kacianka, Severin},
  booktitle = {MoVid '15 Proceedings of the 7th ACM International Workshop on Mobile Video},
  title = {Adaptive Video Streaming for UAV Networks},
  year = {2015},
  address = {New York, USA},
  editor = {Halvorsen, Pal and Dutt, Nikil},
  month = {mar},
  pages = {25-30},
  publisher = {ACM International Conference on Multimedia Systems},
  abstract = {The core problem for any adaptive video streaming solution, particularly over wireless networks, is the detection (or even prediction) of congestion. IEEE 802.11 is especially vulnerable to fast movement and change of antenna orientation. When used in UAV networks (Unmanned Aerial Vehicles), the network throughput can vary widely and is almost impossible to predict. this paper evaluates an approach originally developed by Kofler for home networks, in a single-hop UAV wireless network setting: the delay between the sending of an IEEE 802.11 packet and the receipt of its corresponding acknowledgement is used as an early indicator of the link quality and as a trigger to adapt (reduce or increase) the video stream' s bitrate. Our real-world flight-tests indicate, that this avoids congestion and can frequently avoid the complete loss of video pictures which happens without adaptation.},
  doi = {10.1145/2727040.2727043},
  isbn13 = {978-1-4503-3353-5},
  keywords = {Video Streaming, Adaptive Streaming, UAVs, UAV Communication},
  language = {EN},
  location = {Portland, OR, USA},
  talktype = {none}
}
@InProceedings{Bacher2015a,
  author = {Bacher, Florian and Rainer, Benjamin and Hellwagner, Hermann},
  booktitle = {Proceedings of IEEE International Conference on Multimedia and Expo Workshops},
  title = {Towards Controller-aided Multimedia Dissemination in Named Data Networking},
  year = {2015},
  address = {Los Alamitos, CA, USA},
  editor = {not, available},
  month = {jul},
  pages = {1--6},
  publisher = {IEEE},
  series = {ICMEW '15},
  abstract = {Software Defined Networking (SDN) and Named Data Networking (NDN) are two topics which have received lots of attention in the networking research community in recent years. While both have emerged independently from each other we believe that their core features can be well aligned to each other. Hence combining both may hold potential benefits for network operators. In this paper we investigate the advantage of having a central SDN controller which is aware of the complete topology of an underlying NDN network. In our approach we use the controller for routing Interests for names unknown to the forwarding elements and to find alternative routes in case of link congestion. Another advantage of SDN is the ability to analyze and control the network on an application-layer component which communicates with the controller. This allows the development of application-aware networks that support the specific needs of the applications that use them. As an example use case we assumed a network whose main purpose is to disseminate multimedia content with Zipf-distributed popularity among users. Having an application layer which knows about content popularity statistics we improve the dissemination of multimedia content by instructing dedicated nodes in the network to prefetch content which is expected to become popular in their geographical region or autonomous system (AS) in the near future. The aim of this approach is to reduce the distance to potential consumers and reduce the load of the core network.},
  doi = {10.1109/ICMEW.2015.7169842},
  isbn10 = {978­1­4799­7079­7},
  keywords = {Information Centric Networking; Named Data Networking; Software Defined Networking; Routing; Forwarding; Caching},
  language = {EN},
  location = {Turino, Italy},
  pdf = {https://www.itec.aau.at/bib/files/07169842.pdf},
  talkdate = {2015.07.03},
  talktype = {registered}
}