[67] | Christian Timmerer, Daniel Weinberger, Martin Smole, Reinhard Grandl, Christopher Mueller, Stefan Lederer, Cloud-based Transcoding and Adaptive Video Streaming-as-a-Service, In IEEE Multimedia Communications Technical Committee E-Letter, IEEE Communications Society [online], New York, NY, USA, pp. 7-11, 2015.
[bib] [pdf] |
[66] | Christian Timmerer, Matteo Maiero, Benjamin Rainer, Stefan Petscharnig, Daniel Weinberger, Christopher Mueller, Stefan Lederer, Quality of Experience of Adaptive HTTP Streaming in Real-World Environments, In IEEE Multimedia Communications Technical Committee E-Letter, IEEE Communications Society [online], New York, NY, USA, pp. 6-9, 2015.
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[65] | Stefan Rass, Benjamin Rainer, Matthias Vavti, Johannes Göllner, Andreas Peer, Stefan Schauer, Secure Communication over Software-Defined Networks, In Mobile Networks and Applications, Springer, Springer US, pp. 105-110, 2015.
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[64] | Daniela Pohl, Abdelhamid Bouchachia, Hermann Hellwagner, Online Indexing and Clustering of Social Media Data for Emergency Management, In Neurocomputing, Elsevier, Amsterdam, Netherlands, pp. 168-179, 2015.
[bib] [doi] [abstract]
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.
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[63] | Christian Timmerer, Carsten Griwodz, Ali Cengiz Begen, Thomas Stockhammer, Bernd Girod, Guest Editorial: Adaptive Media Streaming, In IEEE Journal on Selected Areas in Communications, IEEE Communications Society, vol. 32, no. 4, New York, NY, USA, pp. 681-683, 2014.
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[62] | Christian Timmerer, Benjamin Rainer, The Social Multimedia Experience, In IEEE Computer, IEEE Computer Society, vol. 47, no. 3, Los Alamitos, CA, USA, pp. 67-69, 2014.
[bib] [pdf] [abstract]
Abstract: Inter-destination multimedia synchronization and quality of experience are critical to the success of social TV, which integrates television viewing with social networking.
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[61] | Christian Timmerer, MPEG Column: 107th MPEG Meeting, In ACM SIGMultimedia Records, ACM, vol. 6, no. 1, New York, NY, USA, pp. 1-2, 2014.
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[60] | Christian Timmerer, Markus Waltl, Benjamin Rainer, Stefan Lederer, Hermann Hellwagner, Enhancing 3D Video to enable a Fully Immersive Sensory Experiences, In IEEE Multimedia Communications Technical Committee E-Letter, IEEE Communications Society [online], vol. 9, no. 1, New York, NY, USA, pp. 23-26, 2014.
[bib][url] [pdf] |
[59] | Benjamin Rainer, Christian Timmerer, A Generic Utility Model Representing the Quality of Sensory Experience, In ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM) (Ralf Steinmetz, Gheorghita Ghinea, Christian Timmerer, Weisi Lin, Stephen Gulliver, Zheng-Jun Zha, Lei Zhang, Max Mühlhäuser, Alan Smeaton, eds.), ACM, New York, NY, USA, pp. 14:1-14:17, 2014.
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[58] | Tobias Hoßfeld, Christian Keimel, Christian Timmerer, Crowdsourcing Quality-of-Experience Assessments, In Computer, IEEE Computer Society, vol. 47, no. 9, Los Alamitos, CA, USA, pp. 98-102, 2014.
[bib] [doi] [pdf] [abstract]
Abstract: Crowdsourced quality-of-experience (QoE) assessments are more cost-effective and flexible than traditional in-lab evaluations but require careful test design, innovative incentive mechanisms, and technical expertise to address various implementation challenges.
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[57] | Gheorghita Ghinea, Christian Timmerer, Weisi Lin, Stephen Gulliver, Mulsemedia: State of the Art, Perspectives, and Challenges, In ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM), ACM, vol. 11, no. 1s, New York, NY, USA, pp. 17:1-17:23, 2014.
[bib] [pdf] [abstract]
Abstract: Mulsemedia—multiple sensorial media—captures a wide variety of research efforts and applications. This article presents a historic perspective on mulsemedia work and reviews current developments in the area. These take place across the traditional multimedia spectrum—from virtual reality applications to computer games—as well as efforts in the arts, gastronomy, and therapy, to mention a few. We also describe standardization efforts, via the MPEG-V standard, and identify future developments and exciting challenges the community needs to overcome.
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[56] | Gheorghita Ghinea, Christian Timmerer, Weisi Lin, Stephen Gulliver, Guest Editorial: Special Issue on Multiple Sensorial (MulSeMedia) Multimodal Media: Advances and Applications, In ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM), ACM, vol. 11, no. 1s, New York, NY, USA, pp. 9:1-9:2, 2014.
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[55] | Markus Waltl, Benjamin Rainer, Christian Timmerer, Hermann Hellwagner, An End-to-End tool chain for sensory experience based on MPEG-V, In Signal Processing: Image Communication, Elsevier, vol. 28, no. 2, Amsterdam, Netherlands, pp. 136-150, 2013.
[bib][url] [doi] [abstract]
Abstract: This paper provides an overview of our research conducted in the area of Sensory Experience including our implementations using MPEG-V Part 3 entitled ”Sensory Information”. MPEG-V Part 3 introduces Sensory Experience as a tool to increase the Quality of Experience by annotating traditional multimedia data with sensory effects. These sensory effects are rendered on special devices like fans, vibration chairs, ambient lights, scent disposers, water sprayers, or heating/cooling devices stimulating senses beyond the traditional ones. The paper's main focus is on the end-to-end aspects including the generation, transmission, and synchronized rendering of sensory effects with the traditional multimedia data taking movie clips as an example. Therefore, we present in this paper an open source tool chain that provides a complete end-to-end sensory effect generation and consumption framework. Furthermore, we summarize results from various subjective quality assessments conducted in this area. Finally, we point out research challenges that may encourage further research within this emerging domain.
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[54] | Christian Timmerer, MPEG Column: 105th MPEG Meeting, In ACM SIGMultimedia Records, ACM, vol. 5, no. 3, New York, NY, USA, pp. 1-2, 2013.
[bib][url] |
[53] | Christian Timmerer, MPEG column: 103rd MPEG meeting, In ACM SIGMultimedia Records, ACM, vol. 5, no. 1, New York, NY, USA, pp. 1-3, 2013.
[bib][url] |
[52] | Christian Timmerer, MPEG Column: 106th MPEG Meeting, In ACM SIGMultimedia Records, ACM, vol. 5, no. 4, New York, NY, USA, pp. 1-2, 2013.
[bib][url] |
[51] | Christian Timmerer, Anthony Vetro, Recent MPEG Standards for Future Media Ecosystems, In Computing Now, IEEE Computer Society [online], vol. 6, no. 10, Los Alamitos, CA, USA, pp. 1, 2013.
[bib][url] |
[50] | Daniela Pohl, Abdelhamid Bouchachia, Hermann Hellwagner, Social Media for Crisis Management: Clustering Approaches for Sub-Event Detection, In Multimedia Tools and Applications, Springer US, Springer, NY, US, pp. 1-32, 2013.
[bib] |
[49] | Christopher Mueller, Stefan Lederer, Christian Timmerer, Fair Share Dynamic Adaptive Streaming over HTTP, In IEEE Multimedia Communications Technical Committee E-Letter, IEEE Communications Society [online], vol. 8, no. 2, New York, NY, USA, pp. 30-33, 2013.
[bib][url] [pdf] [abstract]
Abstract: Multimedia delivery over the Hypertext Transfer Protocol (HTTP) is currently very popular and with MPEGs' Dynamic Adaptive Streaming over HTTP (DASH) a standard is available to provide interoperability and enable large-scale deployments using existing infrastructures (servers, proxies, caches, etc.). This paper identifies some issue when multiple DASH clients compete for a bandwidth bottleneck when transparent proxy caches are deployed. Therefore, we propose a fair share adaptation scheme to be included within the client which – through experimental results – achieve a more efficient utilization of the bottleneck bandwidth and less quality switches.
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[48] | Stefan Lederer, Christopher Mueller, Reinhard Grandl, Christian Timmerer, Adaptive Multimedia Streaming over Information-Centric Networks in Mobile Networks using Multiple Mobile Links, In IEEE Multimedia Communications Technical Committee E-Letter, IEEE Communications Society [online], vol. 8, no. 6, New York, NY, USA, pp. 38-41, 2013.
[bib][url] [pdf] |
[47] | Panos Kudumakis, Mark Sandler, Angelos-Christos G Anadiotis, Iakovos S Venieris, Angelo Difino, Xin Wang, Giuseppe Tropea, Michael Grafl, Víctor Rodríguez-Doncel, Silvia Llorente, Jaime Delgado, MPEG-M: A Digital Media Ecosystem for Interoperable Applications, In Signal Processing: Image Communication, Elsevier, Amsterdam, Netherlands, pp. 24, 2013.
[bib][url] [doi] [abstract]
Abstract: MPEG-M is a suite of ISO/IEC standards (ISO/IEC 23006) that has been developed under the auspices of Moving Picture Experts Group (MPEG). MPEG-M, also known as Multimedia Service Platform Technologies (MSPT), facilitates a collection of multimedia middleware APIs and elementary services as well as service aggregation so that service providers can offer users a plethora of innovative services by extending current IPTV technology toward the seamless integration of personal content creation and distribution, e-commerce, social networks and Internet distribution of digital media.
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[46] | Michael Grafl, Christian Timmerer, Hermann Hellwagner, Wael Cherif, Adlen Ksentini, Hybrid Scalable Video Coding for HTTP-based Adaptive Media Streaming with High-Definition Content, In Computer Communications, Elsevier, Amsterdam, Netherlands, pp. 11, 2013.
[bib] [abstract]
Abstract: Scalable Video Coding (SVC) in media streaming enables dynamic adaptation based on device capabilities and network conditions. In this paper, we investigate deployment options of SVC for Dynamic Adaptive Streaming over HTTP (DASH) with a special focus on scalability options, which are relevant for dynamic adaptation, especially in wireless and mobile environments. We establish encoding recommendations and evaluate the performance of SVC with respect to spatial and quality scalability options and compare it to non-scalable Advanced Video Coding (AVC). Performance evaluations are performed for various encoder implementations with high-definition (1080p) content. We show that a hybrid approach with multiple independent SVC bitstreams can have advantages in storage requirements at comparable rate-distortion performance.
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[45] | Michael Grafl, Christian Timmerer, Hermann Hellwagner, George Xilouris, Georgios Gardikis, Daniele Renzi, Stefano Battista, Eugen Borcoci, Daniel Negru, Scalable Media Coding enabling Content-Aware Networking, In IEEE MultiMedia, IEEE Computer Society, vol. 20, no. 2, Los Alamitos, CA, USA, pp. 30-41, 2013.
[bib] [doi] [pdf] [abstract]
Abstract: Given that multimedia services are becoming increasingly popular, they are expected to play a dominant role for the Future Internet. In this context, it is essential that Content-Aware Networking (CAN) architectures, as envisaged in the frame of the Future Internet, explicitly address the efficient delivery and processing of multimedia content. This article proposes adopting a content-aware approach into the network infrastructure, thus making it capable of identifying, processing, and manipulating (i.e., adapting, caching, etc.) media streams and objects in real time towards Quality of Service/Experience (QoS/QoE) maximization. Our proposal is built upon the exploitation of scalable media coding technologies within such a content-aware networking environment and is discussed based on four representative use cases for media delivery (unicast, multicast, peer-to-peer, and adaptive HTTP streaming) and with respect to a selection of CAN challenges, specifically flow processing, caching/buffering, and QoS/QoE management.
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[44] | Markus Waltl, Christian Timmerer, Benjamin Rainer, Hermann Hellwagner, Sensory Effects for Ambient Experiences in the World Wide Web, In Multimedia Tools and Applications, Springer Verlag, vol. -, no. -, Berlin, Heidelberg, New York, pp. 1-20, 2012. (Online First)
[bib][url] [doi] [abstract]
Abstract: More and more content in various formats becomes available via the WorldWideWeb (WWW). Currently availableWeb browsers are able to access and interpret these contents (i.e., Web videos, text, image, and audio). These contents stimulate only senses like audition or vision. Recently, it has been proposed to stimulate also other senses while consuming multimedia content, through so-called sensory effects. These sensory effects aim to enhance the ambient experience by providing effects such as light, wind, vibration, etc. The effects are represented as Sensory Effect Metadata (SEM) description which is associated to multimedia content and is rendered on devices like fans, vibration chairs, or lamps. In this paper we present two subjective quality assessments which comprise sensory effects, such as light, in the area of the WWW and their results achieved. The first assessment evaluates the influence of light effects on the Quality of Experience (QoE). The second assessment measures the impact of different settings for the color calculation on the viewing experience. Furthermore, we describe a Web browser plug-in for Mozilla Firefox which is able to render such sensory effects that are provided via the WWW.
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[43] | Christian Timmerer, MPEG column: 101st MPEG meeting, In ACM SIGMultimedia Records, ACM, vol. 4, no. 3, New York, NY, USA, pp. 9-11, 2012.
[bib][url] |