Made available in DSpace on 2014-06-12T15:51:44Z (GMT). No. of bitstreams: 2 arquivo2806_1.pdf: 3483412 bytes, checksum: cab776dc5a3fdf07c8cda900906f6a98 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2011 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Aires Moreira, Josilene; Fawzi Hadj Sadok, Djamel. Cache strategies for internet-based video on-demand distribution. 2011. Tese (Doutorado). Programa de Pós-Graduação em Ciência da Computação, Universidade Federal de Pernambuco, Recife, 2011.

I denna rapport ställs frågor beträffande hur Viaplays streamingtjänst kan se ut i framtiden gällande TVOD och SVOD genom nya designlösningar. För att göra detta har en människo-centrerad designprocess använts för att undersöka attityder och beteenden kring TVOD. I undersökningen utreddes det hur konsumenter ser på TVOD och kombinationen med SVOD. Vad vill användarna ha, hur ser deras vanor och beteenden ut gällande hyrfilm i sin helhet? Examensarbetet har gjorts på plats hos Viaplay och med hjälp av Viaplays designteam. Utifrån djupintervjuer och användartester blev det möjligt att kartlägga en viss sannolikhet över hur användare ser på TVOD i kombination med SVOD och vilka designlösningar som är möjliga för att motivera och inspirera konsumenter till TVOD-köp. Undersökningen resulterade i en high-fidelity-prototyp som genomgick användartester där hypoteser testades med en, överlag, positiv utgång. / This report question as to how Viaplay as a streaming service might look like in the future regarding TVOD and SVOD through new design solutions. To do this, a human-centered design process was used to examine attitudes and behaviors upon TVOD. The study investigated how consumers comprehend TVOD and the combination with SVOD. What do users want, how do their habits and behavior look like concerning movie rentals as whole? The thesis has been executed on site at Viaplay with assistance from their design team. Based on in-depth interviews and user tests, it was possible to identify a probability of how users comprehend TVOD combined with SVOD and what design solutions are imaginable to motivate and inspire consumers to take part in TVOD-purchases. All in all, this thesis resulted in a high-fidelity prototype that underwent user tests in which hypotheses were tested with an, overall, positive outcome.

La thèse compare des approches de politique publique en France, le Royaume Uni et les Etats Unis sur la convergence des services de télécommunications et de télévision-vidéo et formule des recommandations de politique publique. Elle commence par des changements évidents que la convergence projette sur tout l’écosystème TIC et explique comment elle permet de changer la relation entre les opérateurs de télécom et les fournisseurs de contenu. La thèse propose de nouvelles idées dans plusieurs domaines de connaissance liées à la convergence des télécoms et télévision-vidéo, tels que les effets verticaux, les offres groupées, la neutralité du réseau et le rôle des fournisseurs OTT. D’un côté, elle formule des recommandations très précises sur le traitement futur de ces aspects dans le nouvel environnement convergent et, de l’autre côté, fournit un panorama général qui essaie de capter les tendances les plus importantes du phénomène de convergence.Le chapitre introductif formule la question de recherche et les sous-questions. Il établit également la raison pour laquelle ces questions sont pertinentes ainsi que la méthode à utiliser. Le Chapitre 2 sur les développements historiques, décrit les cadres réglementaires et de la concurrence présents et passés, par rapport à la concurrence dans les télécoms et la télévision-vidéo, dans les trois pays.Le Chapitre 3 sur les effets verticaux fournit une analyse comparée des décisions de régulation et du droit de la concurrence dans les services télévision payante et de la vidéo. Il va au delà de l’analyse des décisions des concentrations et inclut toutes les décisions de régulation et antitrust pertinentes de 1996 à 2015. Même si le chapitre couvre aussi une revue de la théorie économique sur les effets verticaux, appliquée aux marchés de la vidéo, il essaie d’identifier les différentes approches des autorités dans l’application de la théorie économique.Le Chapitre 4 porte sur les offres groupées 3-play et 4-play. La première partie se focalise sur la perception des consommateurs des offres groupées. Le chapitre utilise un modèle de prix hédoniques des offres 3-play et 4-play dans les trois pays. Un effort particulier a été fait pour développer des indicateurs de qualité plus sophistiqués pour le composant télévision payante. La deuxième partie porte sur les incitations des entreprises pour vendre des offres groupées en fonction de leurs indicateurs financiers principaux. Cette partie fournit une analyse préliminaire des incitations des opérateurs à fournir des offres groupées.Le Chapitre 5 sur la neutralité du réseau présente les éléments principaux du débat sur la neutralité du réseau. Un chapitre indépendant sur la neutralité se justifie par: i) la pertinence globale du débat sur la neutralité du réseau, ii) l’importance croissante de la fourniture des services de vidéo sur l’Internet, et iii) la condition de la neutralité du réseau comme lien entres les opérateurs de télécom et les fournisseurs de contenu.Le chapitre 6 regarde un des aspects les plus distinctifs de la convergence des services de télécom et de la vidéo: l’émergence des fournisseurs de vidéo online (over-the-top) qui ne sont pas issus des acteurs traditionnels de l’industrie de la télévision ou de la vidéo. La thèse, comme la plupart des autorités de la concurrence, a une perception positive du rôle des OTT comme moteurs de la concurrence et propose que leur développement soit privilégié. Le chapitre essaie d’identifier les barrières principales pour le développement des OTT.Le chapitre final (chapitre 7) résume les conclusions de la thèse et formule des recommandations de politiques publiques, que les pays sont encouragés à évaluer. Ces recommandations résument le contenu des autres chapitres et rajoutent des détails supplémentaires sur les changements législatifs et institutionnels que seraient nécessaires pour les mettre en oeuvre. / This dissertation compares public policy approaches in France, the United Kingdom and the Untied States in relation to convergence between telecommunications and television/video services and puts forward policy recommendations. It starts from the evident changes that convergence is spreading throughout the ICT ecosystem and how it is changing the relationship between telecommunication operators and content providers. The dissertation provides new thinking in a number of areas relating to convergence of telecommunications and television/video services, such as vertical effects, bundling behaviour, network neutrality or the role of OTT video providers. The dissertation aims, on one hand, at formulating very precise recommendation as to how these aspects should be treated in the new convergent environment and, on other hand, at provider a comprehensive view that captures the big picture of the convergence phenomenon.The introductory chapter formulates the research question and sub-questions, why these questions are relevant and the methodology used and Chapter 2 on historical developments describes past and current policy and regulatory frameworks, in relation to competition in telecommunication and television/video services, in the three countriesChapter 3 on vertical effects provides a comparative analysis of competition law and regulatory decision in relation to competition in pay-television/video services. It not only contains merger decisions but also all the relevant regulatory and antitrust decisions between 1996 and 2015. While this chapter also includes to some extent a review of state-of-the-art economic theory on vertical effects, applied to video markets, it aims at identifying the different approaches taken by the authorities in applying economic theory.Chapter 4 addresses bundling of telecommunication and video services, in particular 3-play and 4-play bundles. The first section focuses on customers’ perception of bundled services. This has been modelled through a hedonic price analysis of 3- and 4-play bundles in the three countries. A significant effort has been made to develop more sophisticated quality indicators for this component. The second section focuses on firms’ incentives to sell 3-play communication bundles as a function of their main financial indicators. This section contains a preliminary analysis of operators’ incentives to bundle.Chapter 5 on network neutrality presents the main elements of the network neutrality debate. A standalone chapter on network neutrality is justified based on: i) the global relevance of the network neutrality debate, ii) its importance for the delivery of video services over the Internet and iii) network neutrality’s nature of conceptual link between video and communication services.Chapter 6 examines one of distinctive aspects of convergence of video and telecommunication services: the emergence of online (or over-the-top) video providers which do not come from the traditional television or video industry. This dissertation, as most competition authorities, welcomes the role of OTTs as competition promoters and suggests that the development of these players should be incentivised.The final chapter (Chapter 7) summarises the dissertation’s conclusions and formulates policy recommendations, for countries to consider. These recommendations summarise the content of the rest of the chapters and provide additional details on the legislative and institutional changes that would be needed to implement them.

This paper focuses on the changes in distribution of television content which emerged during the process of convergence between television and digital media. Nowadays it is possible not only to access television broadcasting online, but also to access individual programs through Video on Demand services. The precondition this topic was picked on is that the very existence of such services has a direct impact on the form of today's television broadcasting. Therefore the aim of this paper is to examine and describe alterations which can be found not only in the broadcasting itself but also in receiving of that broadcasting on television screens. The latter can be affected by the existence of HbbTV. The analysis and description of changes in broadcasting and receiving television content in Czech republic are the primary focuses of this paper.

The master’s thesis deals with testing the application protocol HLS and RTSP in JMeter program. The aim of this thesis is to design and implement a test modules for both protocols, which will perform stress tests. The first part of thesis describes the types of stress tests, JMeter program for performance testing and video on demand services. Next chapter describes selected protokols, especially HLS and RTSP, which are used in this thesis. The practical part contains the design and implementation of test modules including test plans. Finally, the results are processed and commented.

Denna studie undersöker olika faktorer som påverkar livestreaming ur mottagare-, sändare- samt teoretiskt perspektiv. För att därigenom skapa en ökad kunskap gällande dess användande och engagemang. Under processen har grundad teori använts som forskningsperspektiv och både kvalitativa intervjuer och fokusgrupper har genomförts. Resultatet visar att där är viktiga steg för att skapa engagemang. Medvetenhet, där mottagaren görs medveten om företaget via spridning. Intresse, där ett intresse skapas med hjälp av innehållet men där vaksamhet bör tas gällande Fear of Missing out respektive Video-On-Demand och dess inverkan på mottagaren. Interaktion och engagemang, där en dialog skapas med mottagaren och en gemenskap byggs upp där publiken är deltagande. Dessa steg leder till lojalitet och förespråkare som är villiga att sprida företaget och dess innehåll vidare. Slutsatsen konstaterar att dessa steg borde ses som en cirkel istället för en trappa. Vilket betyder att alla är lika viktiga delar i att skapa ett engagemang. De bygger även vidare på varandra och det sista steget är inte slutresultatet utan bör ses som en pågående process som leder oss tillbaka till första steget. / This study seeks to explore the motives behind livestreaming from a sender-, receiver- and theoretical perspective. With the aim to create a better understanding for receiver engagement and sender usage. During the process, grounded theory was used as research method and both qualitative interviews and focus groups were implied. The results show that there are important steps to create engagement. Aware, where you make the receiver know about you through coverage. Interest, where you create an interest with the content your making but also watch out for the impact Fear of Missing out and Video-On-Demand might have on the receiver. Interaction and engagement, where you create a dialogue with the receiver and build a community where the audience is participating. These steps lead to loyalty and advocates who are willing to spread you and your content further. In conclusion, these steps are to be approached as a circle rather than a ladder. Meaning that they are all important components of creating engagement. They build on each other and the last step is not the end result but an ongoing progress leading us back to step one.

This thesis describes the phenomena of interactive television, focusing on the development of this technology in the United Kingdom which is considered the country with the largest development of this technology. The thesis starts by defining interactive television as such, dividing it into three main categories. Aside of that a short overview of the evolution of television broadcasting in the United Kingdom is presented, and the term Convergence is explained as it is a crucial one for many of the interactive applications. The second part consists of a case study of evolution of interactive television in the United Kingdom. As it tries to answer the main research question - which technological phases must have happened in the transition from linear to interactive television - the thesis divides interactive television into five main phases. The first phase occurs in the analogue broadcasting era, with Teletext as the first instance of "on demand", and first instance of convergence by using telephone. The second phase starts around 1998 with the start of digitalisation. The new technology allows the providers to launch several new forms of interactivity, such as the walled garden, first applications and others. The third phase, starting around 2002 can be seen as the acceptance of interactivity as a...

This diploma thesis focuses on the news server Seznam Zprávy. Its goal is to find out, how the server established in the period of the first two years since its creation in October 2016. The goal of the work is to describe the specifics of online media and the Internet, which users are able to access not only from technologies such as computer or mobile devices, but also within smart TVs in the form of HbbTV. The main aim of the analytical part is to find out how this news server established itself within the Czech media landscape. The main factor the interest of the audience and the frequency of citations of the diary in other Czech media. News server Seznam Zprávy is compared with other, currently most popular, Czech news online journals: iDNES, Novinky, Denik, Aktualne, Lidovky and iRozhlas. This thesis offers statistics of data about traffic and the numbers of real users available from the NetMonitor.cz. Based on them, it is determined what success the server Seznam Zprávy for the first two years of the audience recorded. In the role of other indicators are the number of citations in other media. Overview of this data has been provided by the online media archive of Newton Media. The last indicator is the interest in social profiles of the medium on Facebook, Instagram and Twitter.

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No. of bitstreams: 1 Dissertação- Jhonathan Araújo Oliveira.pdf: 17407325 bytes, checksum: 9ed1cb282822c8dd666684f5cc5e0219 (MD5) Previous issue date: 2013-09-24 / Scalability and high demand for resources are the main challenges that content providers face in multimedia applications based on networks. For instance, YouTube is one of the most popular delivery systems video on demand, the users send 100 hours of video every minute to its servers and more than four billion hours of video are watched every month. The CDN-P2P systems is widely recognized as a scalable alternative for multimedia content delivery in the Internet. In these systems, the peers from a peerto- peer network (P2P) share their resources thus reducing the demands on the network infrastructure for content delivery (CDN). Moreover, the CDN server to guarantee the availability of content when the peers contributions are limited by the churn, or when the content is is unprecedented to the peers of the P2P network. However, CDN-P2P systems alone do not guarantee the effectiveness of the services, since the peers output that are the only holders of a particular contents can generate congestion around the CDN server and degrade the quality of users experience. This dissertation investigates the contribution of stable peers for availability content on the on the P2P slice form a CDN-P2P system designed to distribute videos similar to those distributed by YouTube. In this way, the data were collected from the real YouTube Web site, exploring the potential of the users that have been access the playlists to characterize the stability of the peers in the system. The assumption about the effectiveness of playlists viewers int the availability content, due to the increased of the stay connnected of these users in the system and the possible popularity of contents shared by them. It was found that when a large number of the peers players pairs of the playlists spend long sessions connected, the improvement of the availability of content was in 60%. Additionally, in scenarios of low participation of players in playlists, its was the improvement outperformed in 20%. Furthermore, we evaluated how the build policies of the mesh impact the distribution system when the peers are grouped and identified as ordinaries and stable. These policies structure the portion of the P2P system through the criterias that are employed on arrival, maintenance and management of the connections of the peers, thus reducing the demands on the CDN server. / A escalabilidade e a alta demanda por recursos são os principais desafios que os provedores de conteúdo enfrentam na viabilização de aplicações multimídia baseadas em redes. No YouTube, por exemplo, um dos mais populares sistemas de distribuição de vídeo sob demanda, são enviadas 100 horas de vídeo a cada minuto aos seus servidores e mais de quatro bilhões de horas de vídeo são assistidas a cada mês. Sistemas CDN-P2P têm sido apontados como uma alternativa escalável para distribuição de conteúdo multimídia na Internet. Nesses sistemas, os pares da rede par-a-par (P2P) compartilham seus recursos, diminuindo as demandas sobre a infraestrutura da rede de distribuição de conteúdo (CDN). Por outro lado, os servidores da CDN garantem a disponibilidade de conteúdo quando as contribuições dos pares são limitadas pelo churn, ou quando o conteúdo for inédito aos pares da rede P2P. Contudo, sistemas CDN-P2P, por si só, não garantem a efetividade dos serviços, visto que a saída de pares que são os únicos detentores de um determinado conteúdo pode gerar congestionamento ao redor do servidor da CDN e degradar a qualidade de experiência dos usuários. Nesta dissertação investiga-se a contribuição de pares estáveis para disponibilidade de conteúdo na parte P2P de um sistema CDN-P2P concebido para distribuir vídeos similares aos distribuídos pelo YouTube. Para isso, dados reais foram coletados do site YouTube, explorando-se o potencial de usuários que acessam playlists para caracterizar a estabilidade dos pares no sistema. A suposição acerca da efetividade dos tocadores de playlists na disponibilidade de conteúdo deve-se Ao maior tempo de permanência desses usuários no sistema e á possível popularidade dos conteúdos por eles compartilhados. Verificou-se que quando um número grande de pares tocadores de playlists passam longas sessões conectados, a melhoria na disponibilidade de conteúdo foi de 60%. Adicionalmente em cenários de baixa participação dos tocadores de playlists a melhoria superou 20%. Em seguida, avaliou-se de que forma políticas de formação da malha impactam o sistema de distribuição estudado quando os pares são agrupados e identificados como estáveis e comuns. Estas políticas estruturam a porçãoP2P do sistema através de critérios que são empregados na chegada, na manutenção e gerência das conexões dos pares, diminuindo assim as exigências sobre o servidor da CDN.

There are some new challenges in system administration and design to optimize the resource management for a cloud based application. Some applications demand stringent performance requirements (e.g. delay and jitter bounds), while some applications exhibit bursty (volatile) workloads. This thesis proposes an epidemic model inspired (and continuous time Markov Chain based) framework, which can reproduce workload volatility namely the "buzz effects" (when there is a sudden increase of a content popularity) of a Video on Demand (VoD) system. Two estimation procedures (heuristic and a Markov Chain Monte Carlo (MCMC) based approach) have also been proposed in this work to calibrate the model against workload traces. Obtained model parameters from the calibration procedures reveal some interesting property of the model. Based on numerical simulations, precisions of both procedures have been analyzed, which show that both of them perform reasonably. However, the MCMC procedure outperforms the heuristic approach. This thesis also compares the proposed model with other existing models examining the goodness-of-fit of some statistical properties of real workload traces. Finally this work suggests a probabilistic resource provisioning approach based on a Large Deviation Principle (LDP). LDP statistically characterizes the buzz effects that causeextreme workload volatility. This analysis exploits the information obtained using the LDP of the VoD system for defining resource management policies. These policies may be of some interest to all stakeholders in the emerging context of cloud networking.