% Categories: SCALIPTV % Encoding: utf-8 @InCollection{Hellwagner2011, author = {Hellwagner, Hermann and Kofler, Ingo and Eberhard, Michael and Kuschnig, Robert and Ransburg, Michael and Sablatschan, Michael}, booktitle = {Streaming Media Architectures, Techniques and Applications: Recent Advances}, publisher = {Information Science Reference}, title = {Scalable Video Coding: Techniques and Applications for Adaptive Streaming}, year = {2011}, address = {Hershey, PA, USA}, editor = {Zhu, Ce and Li, Yuenan and Niu, Xiamu}, month = {jan}, pages = {1-23}, abstract = {This chapter covers the topic of making use of scalable video content in streaming frameworks and applications. Specifically, the recent standard H.264/SVC, i.e., the scalable extension of the widely used H.264/AVC coding scheme, and its deployment for adaptive streaming, the combined activities of content adaptation and streaming, are considered. H.264/SVC is regarded as a promising candidate to enable applications to cope with bandwidth variations in networks and heterogeneous usage environments, mainly diverse end device capabilities and constraints. The relevant coding and transport principles of H.264/SVC are reviewed first. Subsequently, an overview of H.264/SVC applications is given. The chapter then focuses on presenting architectural/implementation options and applications of H.264/SVC for adaptive streaming, emphasizing the aspect of where, i.e., on which network node and on which layer in the networking stack, in the video delivery path the content adaptation can take place; also, methods of content adaptation are covered. This pragmatic perspective is seen as complementing more general discussions of scalable video adaptation issues in the existing literature.}, doi = {10.4018/978-1-61692-831-5}, isbn10 = {161692831X}, isbn13 = {9781616928315}, language = {EN} } @InProceedings{Sablatschan2010, author = {Sablatschan, Michael and Ransburg, Michael and Hellwagner, Hermann}, booktitle = {Proceedings of the Second International Conferences on Advances in Multimedia (MMEDIA 2010)}, title = {Towards an Improved SVC-to-AVC Rewriter}, year = {2010}, address = {Los Alamitos, CA, USA}, editor = {Böszörmenyi, Laszlo and Burdescu, Dumitru and Davis, Philip and Stanchev, Peter}, month = {jun}, pages = {18-21}, publisher = {IEEE}, abstract = {The Scalable Video Coding (SVC) extension of the H.264/AVC (AVC) video coding standard features spatial, quality and temporal scalability. Backwards compatibility with legacy decoding devices is maintained through an H.264/AVC compliant base layer, which represents the lowest quality of an SVC bit-stream. However, it is often desirable to also provide the higher quality layers to legacy H.264/AVC devices. This is achieved by a process commonly known as “bit-stream rewriting”, which allows for an efficient SVC to AVC conversion by exploiting the similarities of the two codecs. This paper introduces an improved version of the existing JSVM reference software rewriter (JSVM-rewriter). The improvements include a better run-time performance through parallel processing, as well as applicability in streaming scenarios. A detailed evaluation provides performance measurements for the improved rewriter and compares it to the existing JSVM-rewriter. The evaluation shows that notable performance improvements can be achieved using the presented approach. The paper concludes on how the rewriter could be further improved.}, doi = {10.1109/MMEDIA.2010.27}, language = {EN}, location = {Athens, Greece}, pdf = {https://www.itec.aau.at/bib/files/Towards_an_Improved_SVC2AVCRewriter_MMEDIA2010_Sablatschan.pdf}, talkdate = {2010.06.14}, talktype = {registered}, url = {http://www.iaria.org/conferences2010/MMEDIA10.html} } @InProceedings{Ransburg2010, author = {Ransburg, Michael and Jonke, Mario and Hellwagner, Hermann}, booktitle = {Proceedings of the First Workshop on Mobile Multimedia Networking (IWMMN 2010)}, title = {An Evaluation of Mobile End Devices in Multimedia Streaming Scenarios}, year = {2010}, address = {Heidelberg/Berlin, Germany}, editor = {Wang, Honggang and Xia, Jinchun}, month = {jun}, pages = {14}, publisher = {Springer}, abstract = {This paper compares handhelds based on the iPhone and Android operating systems in multimedia streaming scenarios. We simulate typical Internet network impairments, i.e. packet delay and packet loss, and evaluate their effects on the end devices. Additional evaluations include bandwidth overhead in icted by the different streaming approaches and traffic shape and fairness when both handhelds consume media simultaneously. Based on the quantitative evaluation, both approaches show weaknesses and strengths. A final qualitative discussion points out additional advantages for the streaming approach implemented in the iPhone operating system.}, doi = {10.1007/978-3-642-17758-3_31}, language = {EN}, location = {Chicago, IL, USA}, pdf = {https://www.itec.aau.at/bib/files/Ransburg_IWMMN10.pdf}, talkdate = {2010.06.30}, talktype = {registered}, url = {http://www.mobilware.org/2010/} } @InProceedings{OrtizMurillo2010, author = {Ortiz Murillo, Jordi and Ransburg, Michael and Martínez Graciá, Eduardo and Sablatschan, Michael and Gómez Skarmeta, Antonio and Hellwagner, Hermann}, booktitle = {Proceedings of the Workshop on Quality of Experience for Multimedia Content Sharing (QoEMCS 2010)}, title = {Towards User-driven Adaptation of H.264/SVC Streams}, year = {2010}, address = {Tampere, Finland}, editor = {Buchinger, Shelley and Lopes, Rui Jorge and Jumisko-Pyykkö, Satu and Zepernick, Hans-Jürgen}, month = {jun}, pages = {4}, publisher = {Tampere University of Technology}, abstract = {H.264/SVC enables runtime-efficient scalability in the spatial, temporal and fidelity dimension. Existing adaptation mechanisms facilitate this to automatically adapt the H.264/ SVC stream to the current usage environment without any user interaction. This paper argues that the Quality of Experience (QoE) of the end user can be enhanced by enabling him to manually adjust the adaptation if he wishes to do so. An approach which enables this is presented and evaluated. It is shown that by facilitating this approach an increased QoE is provided compared to automatic adaptation approaches. Finally, future work indicates the next steps in order to implement this approach.}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Towards User-driven Adaptation of H.264-SVC Streams.pdf}, talktype = {none}, url = {http://dcti.iscte.pt/events/qoemcs/} }