[204] | Harald Beck, Bruno Bierbaumer, Minh Dao-Tran, Thomas Eiter, Hermann Hellwagner, Konstantin Schekotihin, Stream Reasoning-Based Control of Caching Strategies in CCN Routers, In Communications (ICC), 2017 IEEE International Conference on (Jean Luc Beylat, Hikmet Sari, eds.), IEEE, Paris, France, pp. 6, 2017.
[bib] [doi] [abstract]
Abstract: Routers in Content-Centric Networking (CCN) may locally cache frequently requested content in order to speed up delivery to end users. Thus, the issue of caching strategies arises, i.e., which content shall be stored and when it should be replaced. In this work, we employ, and study the feasibility of, novel techniques towards intelligent control of CCN routers that autonomously switch between existing caching strategies in response to changing content request patterns. In particular, we present a router architecture for CCN networks that is controlled by rule-based stream reasoning, following the recent formal framework LARS which extends Answer Set Programming for streams. The obtained possibility for flexible router configuration at runtime allows for versatile network control schemes and may help advance the further development of CCN. Moreover, the empirical evaluation of our feasibility study shows that the resulting caching agent may give significant performance gains.
|
[203] | Anatoliy Zabrovskiy, Evgeny Kuzmin, Evgeny Petrov, Christian Timmerer, Christopher Mueller, AdViSE: Adaptive Video Streaming Evaluation Framework for the Automated Testing of Media Players, In Proceedings of the 8th ACM on Multimedia Systems Conference (MMSys'17) (Kuan-Ta Chen, ed.), ACM, New York, NY, USA, pp. 4, 2017.
[bib] [doi] [pdf] [abstract]
Abstract: Today we can observe a plethora of adaptive video stream- ing services and media players which support interoperable formats like DASH and HLS. Most of the players and their rate adaptation algorithms work as a black box. We have de- veloped a system for easy and rapid testing of media players under various network scenarios. In this paper, we introduce AdViSE, the Adaptive Video Streaming Evaluation frame- work for the automated testing of adaptive media players. The presented framework is used for the comparison and testing of media players in the context of adaptive video streaming over HTTP in web/HTML5 environments. The demonstration showcases a series of experiments with different media players under given context conditions (e.g., network shaping, delivery format). We will also demonstrate the real-time capabilities of the framework and offline anal- ysis including several QoE metrics with respect to a newly introduced bandwidth index.
|
[202] | Christian Timmerer, Anatoliy Zabrovskiy, Evgeny Kuzmin, Evgeny Petrov, Quality of experience of commercially deployed adaptive media players, In 2017 21st Conference of Open Innovations Association (FRUCT) (Sergey Balandin, ed.), N.N., N.N., pp. 330-335, 2017.
[bib] [doi] [pdf] [abstract]
Abstract: In the past decade we observed the transition from push-based, fully managed media streaming to pull-based, unmanaged adaptive HTTP streaming thanks to enhancements in media compression, network capacity, and client capabilities. Adaptive media players, specifically their algorithms, have been subject to research for a long time and lead to various approaches documented in the literature. In the past years we witnessed more and more commercial deployments taking into account findings presented in scientific papers but a quantitative evaluation and assessments of its performance is missing. In this paper, we propose means for the automated performance evaluation of commercially deployed adaptive media players with respect to i) objective, well-known metrics, such as bitrate, stalls, startup delay and ii) derived/calculated metrics (instability, inefficiency, average bitrate) previously proposed in the literature. Additionally, we propose a new metric (Bandwidth index) to measure the effectiveness of bandwidth utilization and together with existing QoE models for adaptive HTTP streaming (focusing on stalls, startup delay) we demonstrate its usefulness in this domain.
|
[201] | Christian Timmerer, Mario Graf, Christopher Mueller, Adaptive Streaming of VR/360-degree Immersive Media Services with high QoE, In 2018 NAB Broadcast Engineering and IT Conference (BEITC) (not available, ed.), National Association of Broadcasters (NAB), Washington DC, USA, pp. 5, 2017.
[bib] [pdf] |
[200] | Raimund Schatz, Andreas Sackl, Christian Timmerer, Bruno Gardlo, Towards Subjective Quality of Experience Assessment for Omnidirectional Video Streaming, In 2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX) (Alexander Raake, ed.), IEEE, New York, USA, pp. 6, 2017.
[bib] [doi] [pdf] [abstract]
Abstract: Currently, we witness dramatically increasing interest in immersive media technologies like Virtual Reality (VR), particularly in omnidirectional video (OV) streaming. Omnidirectional (also called 360-degree) videos are panoramic spherical videos in which the user can look around during playback and which therefore can be understood as hybrids between traditional movie streaming and interactive VR worlds. Unfortunately, streaming this kind of content is extremely bandwidth intensive (compared to traditional 2D video) and therefore, Quality of Experience (QoE) tends to deteriorate significantly in absence of continuous optimal bandwidth conditions. In this paper, we present a first approach towards subjective QoE assessment for omnidirectional video (OV) streaming. We present the results of a lab study on the QoE impact of stalling in the context of OV streaming using head-mounted displays (HMDs). Our findings show that subjective testing for immersive media like OV is not trivial, with even simple cases like stalling leading to unexpected results. After a discussion of characteristic pitfalls and lessons learned, we provide a a set of recommendations for upcoming OV assessment studies.
|
[199] | Philipp Moll, Daniel Posch, Hermann Hellwagner, Investigation of push-based traffic for conversational services in Named Data Networking, In Proceedings of the IEEE International Conference on Multimedia and Expo Workshops (ICMEW) 2017 (Beatrice Pesquet-Popescu, Chong-Wah Ngo, eds.), IEEE, Hong Kong, pp. 315-320, 2017.
[bib][url] [doi] [pdf] [abstract]
Abstract: Conversational services (e.g., Internet telephony) exhibit hard Quality of Service (QoS) requirements, such as low delay and jitter. Current IP-based solutions for conversational services use push-based data transfer only, since pull-based communication as envisaged in Named Data Networking (NDN) suffers from the two-way delay. Unfortunately, IP's addressing scheme requires additional services for contacting communication partners. NDN provides an inherent solution for this issue by using a location-independent naming scheme. Nevertheless, it currently does not provide a mechanism for push-based data transfer. In this paper, we investigate Persistent Interests as a solution for push-based communication. We improve and implement the idea of Persistent Interests, and study their applicability for conversational services in NDN. This is done by comparing different push- and pull-based approaches for Internet telephony.
|
[198] | Philipp Moll, Julian Janda, Hermann Hellwagner, Adaptive Forwarding of Persistent Interests in Named Data Networking, In Proceedings of the 4th ACM Conference on Information-Centric Networking (Thomas C Schmidt, Jan Seedorf, eds.), ACM, New York, NY, USA, pp. 180-181, 2017.
[bib][url] [doi] [pdf] [abstract]
Abstract: Persistent Interests (PIs) are a promising approach to introduce push-type traffic in Named Data Networking (NDN), in particular for conversational services such as voice and video calls. Forwarding decisions for PIs are crucial in NDN because they establish a long-lived path for the data flowing back toward the PI issuer. In the course of studying the use of PIs in NDN, we investigate adaptive PI forwarding and present a strategy combining regular NDN forwarding information and results from probing potential alternative paths through the network. Simulation results indicate that our adaptive PI forwarding approach is superior to the PI-adapted Best Route strategy when network conditions change due to link failures.
|
[197] | Mario Graf, Christian Timmerer, Christopher Mueller, Towards Bandwidth Efficient Adaptive Streaming of Omnidirectional Video over HTTP: Design, Implementation, and Evaluation, In Proceedings of the 8th ACM on Multimedia Systems Conference (MMSys'17) (Kuan-Ta Chen, ed.), ACM, New York, NY, USA, pp. 11, 2017.
[bib] [pdf] [abstract]
Abstract: Real-time entertainment services such as streaming audio- visual content deployed over the open, unmanaged Internet account now for more than 70% during peak periods. More and more such bandwidth hungry applications and services are proposed like immersive media services such as virtual reality and, specifically omnidirectional/360-degree videos. The adaptive streaming of omnidirectional video over HTTP imposes an important challenge on today’s video delivery infrastructures which calls for dedicated, thoroughly designed techniques for content generation, delivery, and consumption. This paper describes the usage of tiles — as specified within modern video codecs such HEVC/H.265 and VP9 — enabling bandwidth efficient adaptive streaming of omnidirectional video over HTTP and we define various streaming strategies. Therefore, the parameters and characteristics of a dataset for omnidirectional video are proposed and exemplary instanti- ated to evaluate various aspects of such an ecosystem, namely bitrate overhead, bandwidth requirements, and quality as- pects in terms of viewport PSNR. The results indicate bitrate savings from 40% (in a realistic scenario with recorded head movements from real users) up to 65% (in an ideal scenario with a centered/fixed viewport) and serve as a baseline and guidelines for advanced techniques including the outline of a research roadmap for the near future.
|
[196] | Darragh Egan, Conor Keighrey, John Barrett, Yuansong Qiao, Sean Brennan, Christian Timmerer, Niall Murray, Subjective Evaluation of an Olfaction Enhanced Immersive Virtual Reality Environment, In Proceedings of the 2nd International Workshop on Multimedia Alternate Realities (Teresa Chambel, Rene Kaiser, Omar Aziz Niamur, Wei Tsang Ooi, eds.), ACM, New York, NY, USA, pp. 15-18, 2017.
[bib][url] [doi] [pdf] [abstract]
Abstract: Recent research efforts have reported findings on user Quality of Experience (QoE) of immersive virtual reality (VR) experiences. Truly immersive multimedia experiences also include multisensory components such as factional, tactile etc., in addition to audiovisual stimuli. In this context, this paper reports the results of a user QoE study of an olfaction-enhanced immersive VR environment. The results presented compare the user QoE between two groups (VR vs VR + Olfaction) and consider how the addition of olfaction affected user QoE levels (considering sense of enjoyment, immersion and discomfort). Self-reported measures via post-test questionnaire (10 questions) only revealed one statistically significant difference between the groups; in terms of how users felt with respect to their senses being stimulated. The presence of olfaction in the VR environment did not have a statistically significant effect in terms of user levels of enjoyment, immersion and discomfort.
|
[195] | 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.
[bib] [pdf] |
[194] | 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.
[bib] [pdf] |
[193] | 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.
|
[192] | 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.
[bib] |
[191] | 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.
[bib] [pdf] |
[190] | He Xu, Fernando Pereira, Christian Timmerer, Touradj Ebrahimi, Towards Quality of Sensory Experience in Multimedia, In Proceedings of 2015 European Conference on Networks and Communications (EUCNC) (Nicolas Demassieux, Mario Campolargo, eds.), IEEE, Brussels, Belgium, pp. 627-628, 2015.
[bib] [pdf] |
[189] | Christian Timmerer, Daniel Weinberger, Martin Smole, Reinhard Grandl, Christopher Mueller, Stefan Lederer, Live Transcoding and Streaming-as-a-Service with MPEG-DASH, In 2015 IEEE International Conference on Multimedia & Expo Workshops (ICMEW) (Enrico Magli, Stefano Tubaro, Anthony Vetro, eds.), IEEE, Los Alamitos, CA, pp. 1-4, 2015.
[bib] [pdf] [abstract]
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.
|
[188] | Benjamin Rainer, Stefan Petscharnig, Christian Timmerer, Merge And Forward - Self-organized Inter-Destination Multimedia Synchronization, In Proceedings of the 6th ACM International Conference on Multimedia Systems (available not, ed.), ACM International Conference on Multimedia Systems, New York, U.S.A, pp. 77-80, 2015.
[bib] [abstract]
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.
|
[187] | Benjamin Rainer, Stefan Petscharnig, Christian Timmerer, Hermann Hellwagner, Is One Second Enough? - Evaluating QoE for Inter-Destination Multimedia Synchronization using Human Computation and Crowdsourcing, In Seventh International Workshop on Quality of Multimedia Experience (QoMEX 2015) (Athanassios Skodras, ed.), IEEE, Greece, Messinia, pp. 1-6, 2015.
[bib] [pdf] [abstract]
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.
|
[186] | Christian Raffelsberger, Hermann Hellwagner, A Multimedia Delivery System for Delay-/Disruption-Tolerant Networks, In Proceedings of the 13th IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops '15) (Ali Hurson, Sajal K Das, eds.), IEEE, Los Alamitos, CA, USA, pp. 530-536, 2015.
[bib] [doi] [pdf] [abstract]
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.
|
[185] | Christopher Mueller, Stefan Lederer, Reinhard Grandl, Christian Timmerer, Oscillation Compensating Dynamic Adaptive Streaming over HTTP, In Proceedings of 2015 IEEE International Conference on Multimedia and Expo (ICME) (Enrico Magli, Stefano Tubaro, Anthony Vetro, eds.), IEEE, Los Alamitos, CA, pp. 1-6, 2015.
[bib] [doi] [pdf] [abstract]
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.
|
[184] | Christian Kreuzberger, Benjamin Rainer, Hermann Hellwagner, Modelling the Impact of Caching and Popularity on Concurrent Adaptive Multimedia Streams in Information-Centric Networks, In IEEE International Conference on Multimedia Expo Workshops (Cesana Matteo, ed.), IEEE, Los Alamitos, CA, USA, pp. 1-6, 2015.
[bib] [doi] [pdf] [abstract]
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.
|
[183] | Christian Kreuzberger, Daniel Posch, Hermann Hellwagner, A Scalable Video Coding Dataset and Toolchain for Dynamic Adaptive Streaming over HTTP, In Proceedings of the 6th ACM Multimedia Systems Conference (Tsang Ooi Wei, ed.), ACM, New York, NY, USA, pp. 213-218, 2015.
[bib][url] [doi] [pdf] [abstract]
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.
|
[182] | Hermann Hellwagner, Severin Kacianka, Adaptive Video Streaming for UAV Networks, In MoVid '15 Proceedings of the 7th ACM International Workshop on Mobile Video (Pal Halvorsen, Nikil Dutt, eds.), ACM International Conference on Multimedia Systems, New York, USA, pp. 25-30, 2015. (to appear)
[bib] [doi] [abstract]
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.
|
[181] | Florian Bacher, Benjamin Rainer, Hermann Hellwagner, Towards Controller-aided Multimedia Dissemination in Named Data Networking, In Proceedings of IEEE International Conference on Multimedia and Expo Workshops (available not, ed.), IEEE, Los Alamitos, CA, USA, pp. 1-6, 2015.
[bib] [doi] [pdf] [abstract]
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.
|
[180] | Christian Timmerer, Ali Cengiz Begen, Over the Top Content Delivery: State of the Art and Challenges Ahead, In Proceedings of the 2014 ACM Multimedia Conference (Kien Hua, Yong Rui, Ralf Steinmetz, Alan Hanjalic, Apostol Natsev, Wenwu Zhu, eds.), ACM, New York, NY, USA, pp. 1231-1232, 2014.
[bib] [doi] [pdf] [slides] [abstract]
Abstract: In this tutorial we present state of the art and challenges ahead in over-the-top content delivery. It particular, the goal of this tutorial is to provide an overview of adaptive media delivery, specifically in the context of HTTP adaptive streaming (HAS) including the recently ratified MPEG-DASH standard. The main focus of the tutorial will be on the common problems in HAS deployments such as client design, QoE optimization, multi-screen and hybrid delivery scenarios, and synchronization issues. For each problem, we will examine proposed solutions along with their pros and cons. In the last part of the tutorial, we will look into the open issues and review the work-in-progress and future research directions.
|