1,247 research outputs found

    Business model with discount incentive in a P2P-cloud multimedia streaming system

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    Today P2P faces two important challenges: design of mechanisms to encourage users' collaboration in multimedia live streaming services; design of reliable algorithms with QoS provision, to encourage the multimedia providers employ the P2P topology in commercial live streaming systems. We believe that these two challenges are tightly-related and there is much to be done with respect. This paper analyzes the effect of user behavior in a multi-tree P2P overlay and describes a business model based on monetary discount as incentive in a P2P-Cloud multimedia streaming system. We believe a discount model can boost up users' cooperation and loyalty and enhance the overall system integrity and performance. Moreover the model bounds the constraints for a provider's revenue and cost if the P2P system is leveraged on a cloud infrastructure. Our case study shows that a streaming system provider can establish or adapt his business model by applying the described bounds to achieve a good discount-revenue trade-off and promote the system to the users

    IPTV Market Development and Regulatory Aspects

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    Audio description and Australian Television: A position paper

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    Audio description (AD) – also referred to as video description, video programming or descriptive video – is a track of narration included between the lines of dialogue which describes important visual elements of a television show, movie or performance. It is an essential feature in order to make television accessible to audiences who are blind or vision impaired. As the human rights of people with disability become more prioritised and expanding technologies allow an individualisation of the experience of television, AD is becoming increasingly available across the world. For example, from its rudimentary beginnings in Spain in the 1940s, to date AD is available through terrestrial broadcast television in the UK, US, Canada, New Zealand, Ireland, Germany, Spain, Italy, Poland, France, Portugal, the Czech Republic, Korea, Thailand, Austria, Switzerland, Belgium and a number of other European countries. However, it is not available on Australian broadcast television, despite the federally funded agency Screen Australia having created a back catalogue of AD content. Screen Australia is the key funding body for the Australian film industry and according to several policy documents requires funded dramas to create an AD track. While producers may create these tracks, there is no mechanism to broadcast them on television. The Australian government and broadcast industry have stated that they believe it to be too technically complicated and financially prohibitive to offer here. This report outlines an AD position paper based on 5 years of research with Australian audiences with disability conducted by researchers in the Department of Internet Studies and the Critical Disability Research Network at Curtin University Australia. The report focuses in particular on the views of Australians with blindness and vision impairments who have taken part in these projects. The report is divided into three sections. Part 1 considers the broader context of the role of television in facilitating social inclusion, including the idea that television access is a fundamental human right. Part 2 considers the ways AD can be delivered, and begins with a brief history of AD, from its beginnings in the middle part of last century to the modern and innovative formats available today. The Big Access Media (BAM) app is presented as an immediate solution, and we argue the industry, especially the public Audio description position paper • page vii broadcaster, the Australian Broadcasting Corporation (ABC), utilise this app to immediately offer AD content to Australians. It will consider how standards, guidelines and legislation have shaped the AD industry worldwide and offer some common guidelines regarding principles, objectivity and voicing. The provision of AD in Australia is also discussed, specifically in relation to a similar accessibility issue – the provision of closed captions. The section concludes by providing case studies on two aspects of Australian media – the two ABC AD trials and the efforts of Screen Australia to increase AD content in this country. While the insights of blind and visually impaired audience members who require AD are featured throughout the report, Part 3 moves on to discuss these observations in more detail. This focuses on feedback from people regarding their access to television which had been carried out in two earlier research projects – this included 13 interview participants with vision impairment and a further 64 who participated in online surveys. Common themes that emerged included: § The importance of the public broadcaster. § Television being a social activity. § The feeling of exclusion – television is considered integral for inclusion. § Issues surrounding cost – the “economics of disability”. § Contradictory approaches to technology – some were willing to try new technology, others preferred older technology and were unwilling to upgrade. § The frustration that Australian content is audio described when exported overseas or released on DVD but is not available on local broadcast television. § Frustration with watching non-AD television content once AD has been experienced. The section concludes by also considering the potential benefits of AD to other audiences, including the elderly, people with intellectual disabilities and people whose first language is not English. The following recommendations are therefore proposed: § AD be made available on Australian free-to-air television either via terrestrial broadcast, catch-up portals or a dedicated app. § Any imported programming with an AD track created for international audiences must be licensed with the AD track for distribution in Australia. Audio description position paper • page viii § Further research is conducted to establish the mainstream benefits of AD and talking electronic programing guides (EPGs). The ways people consume media is constantly changing – if these formats and technologies can be embraced by the mainstream, disability inclusion will improve. § Regulation and standards introduced in the 1990s be brought up to date with the 21st century digital and online television environment: § The Broadcasting Services Act (BSA) 1992 should immediately be expanded to encompass television screened online; § Australian standards should be introduced to ensure set-top boxes can receive and display AD; § The BSA should be expanded to include AD. § The government needs to support people with disability to acquire digital literacy skills. Low income members of this group should also be supported financially to get online. § Innovation and competition in the business sector must be encouraged, for example to develop more apps to facilitate AD. § Screen Australia policy should be expanded to television drama in more explicit terms. § The public broadcasters should be supported to provide AD. § Australian licensing laws be relaxed to allow pubic broadcasters to continue airing shows on their catch-up portals with AD tracks even when they have moved to commercial or subscription channels. § Further audience research into the feasibility of synthetic voice systems be conducted to discover whether this is an acceptable interim or long-term solution to the provision of AD

    Live media production: multicast optimization and visibility for clos fabric in media data centers

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    Media production data centers are undergoing a major architectural shift to introduce digitization concepts to media creation and media processing workflows. Content companies such as NBC Universal, CBS/Viacom and Disney are modernizing their workflows to take advantage of the flexibility of IP and virtualization. In these new environments, multicast is utilized to provide point-to-multi-point communications. In order to build point-to-multi-point trees, Multicast has an established set of control protocols such as IGMP and PIM. The existing multicast protocols do not optimize multicast tree formation for maximizing network throughput which lead to decreased fabric utilization and decreased total number of admitted flows. In addition, existing multicast protocols are not bandwidth-aware and could cause links to over-subscribe leading to packet loss and lower video quality. TV production traffic patterns are unique due to ultra high bandwidth requirements and high sensitivity to packet loss that leads to video impairments. In such environments, operators need monitoring tools that are able to proactively monitor video flows and provide actionable alerts. Existing network monitoring tools are inadequate because they are reactive by design and perform generic monitoring of flows with no insights into video domain. The first part of this dissertation includes a design and implementation of a novel Intelligent Rendezvous Point algorithm iRP for bandwidth-aware multicast routing in media DC fabrics. iRP utilizes a controller-based architecture to optimize multicast tree formation and to increase bandwidth availability in the fabric. The system offers up to 50\% increase in fabric capacity to handle multicast flows passing through the fabric. In the second part of this dissertation, DiRP algorithm is presented. DiRP is based on a distributed decision-making approach to achieve multicast tree capacity optimization while maintaining low multicast tree setup time. DiRP algorithm is tested using commercially available data center switches. DiRP algorithm offers substantially lower path setup time compared to centralized systems while maintaining bandwidth awareness when setting up the fabric. The third part of this dissertation studies the utilization of machine learning algorithms to improve on multicast efficiency in the fabric. The work includes implementation and testing of LiRP algorithm to increase iRP\u27s fabric efficiency by implementing k-fold cross validation method to predict future multicast group memberships for time-series analysis. Testing results confirm that LiRP system increases the efficiency of iRP by up to 40\% through prediction of multicast group memberships with online arrival. In the fourth part of this dissertation, The problem of live video monitoring is studied. Existing network monitoring tools are either reactive by design or perform generic monitoring of flows with no insights into video domain. MediaFlow is a robust system for active network monitoring and reporting of video quality for thousands of flows simultaneously using a fraction of the cost of traditional monitoring solutions. MediaFlow is able to detect and report on integrity of video flows at a granularity of 100 mSec at line rate for thousands of flows. The system increases video monitoring scale by a thousand-fold compared to edge monitoring solutions

    LIVE STREAMING USING PEER DIVISION MULTIPLEXING

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    A Number of commercial peer-to-peer (P2P) systems for live streaming have been introduced in recent years. The behaviour of the popular systems has been extensively studied in several measurement papers. However, these studies have to rely on a “black-box” approach, where packet traces are collected from a single or a limited number of measurement points, to infer various properties of the traffic on the control and data planes. Although, such studies are useful to compared different systems from the end user’s perspective. It is difficult to intuitively understand the observed properties without fully reverseengineering the underlying systems. In this paper, we describe the network architecture of Zattoo, one of the largest production, live streaming providers, in Europe, at the time of writing, and present a large-scale measurement study of zattoo, using data collected by the provider. To highlight we found that even, when the zattoo system was heavily loaded with as high as 20000 concurrent users on a single overlay, the median channel join delay remained less than 2-5 s, and that, for a majority of users, the streamed signal lags over-the-air broadcast signal by more than 3 s

    User generated content for IMS-based IPTV

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    Includes abstract.Includes bibliographical references.Web 2.0 services have been on the rise due to improved bandwidth availability. Users can now connect to the internet with a variety of portable devices which are capable of performing multiple tasks. Due to this, services such as Voice over IP (VoIP), presence, social networks, instant messaging (IM) and Internet Protocol television (IPTV) to mention but a few, started to emerge...This thesis proposed a framework that will offer user-generated content on an IMS-Based IPTV and the framework will include a personalised advertising system..

    Video-on-Demand over Internet: a survey of existing systems and solutions

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    Video-on-Demand is a service where movies are delivered to distributed users with low delay and free interactivity. The traditional client/server architecture experiences scalability issues to provide video streaming services, so there have been many proposals of systems, mostly based on a peer-to-peer or on a hybrid server/peer-to-peer solution, to solve this issue. This work presents a survey of the currently existing or proposed systems and solutions, based upon a subset of representative systems, and defines selection criteria allowing to classify these systems. These criteria are based on common questions such as, for example, is it video-on-demand or live streaming, is the architecture based on content delivery network, peer-to-peer or both, is the delivery overlay tree-based or mesh-based, is the system push-based or pull-based, single-stream or multi-streams, does it use data coding, and how do the clients choose their peers. Representative systems are briefly described to give a summarized overview of the proposed solutions, and four ones are analyzed in details. Finally, it is attempted to evaluate the most promising solutions for future experiments. Résumé La vidéo à la demande est un service où des films sont fournis à distance aux utilisateurs avec u
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