Intelligent download and cache management for interactive non-linear video

Meixner, Britta; Hoffmann, Jürgen

doi:10.1007/s11042-012-1158-1

Cited by 9 publications

(13 citation statements)

References 64 publications

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“…Typically in these systems, the client uses progressive download, coupled with prefetching strategies and algorithms designed to parse user input and the video's structure [107]. The main drawbacks with such systems are the lack of quality adaptation, which might lead to large stall times due to bandwidth fluctuations and waiting times when performing interactive actions.…”

Section: Content Personalization and Interactive Branched Videomentioning

confidence: 99%

Efficient and Adaptive Content Delivery of Linear and Interactive Branched Videos

Krishnamoorthi¹

2016

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Video streaming over the Internet has gained tremendous popularity over recent years and currently constitutes the majority of Internet traffic. The on-demand delivery of high quality video streaming has been enabled by a combination of consistent improvements in residential download speeds, HTTP-based Adaptive Streaming (HAS), extensive content caching, and the use of Content Distribution Networks (CDNs). However, as large-scale on-demand streaming is gaining popularity, several important questions and challenges remain unanswered, including determining how the infrastructure can best be leveraged to provide users with the best possible playback experience. In addition, it is important to develop new techniques and protocols that facilitate the next generation of streaming applications. Innovative services such as interactive branched streaming are gaining popularity and are expected to be the next big thing in on-demand entertainment. The major contributions of this thesis are in the area of efficient content delivery of video streams using HAS. To address the two challenges above, the work utilizes a combination of different methods and tools, ranging from real-world measurements, characterization of system performance, proof-of-concept implementations, protocol optimization, and evaluation under realistic environments. First, through careful experiments, we evaluate the performance impact and interaction of HAS clients with proxy caches. Having studied the typical interactions between HAS clients and caches, we then design and evaluate content-aware policies to be used by the proxy caches, which parse the client requests and prefetch the chunks that are most likely to be requested next. In addition, we also design cooperative policies in which clients and proxies share information about the playback session. Our evaluations reveal that, in general, the bottleneck location and network conditions play central roles in which policy choices are most advantageous, and the location of the bottlenecks significantly impact the relative performance differences between policy classes. We also show that careful design and policy selection is important when trying to enhance HAS performance using proxy assistance. Second, this thesis proposes, models, designs, and evaluates novel streaming applications such as interactive branched videos. In such videos, users can influence the content that is being shown to them. We design and evaluate careful prefetching policies that provides seamless playback even when the users defer their path choices to the last possible moment. We derive optimized prefetching policies using an optimization framework, design and implement effective buffer management techniques for seamless playback at branch points, and use parallel TCP connections to achieve efficient buffer workahead. Through performance evaluations, we show that our policies can effectively prefetch data of carefully adapted qualities along multiple alternative paths so to ensure seamless playback, offering users a ple...

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Section: Content Personalization and Interactive Branched Videomentioning

confidence: 99%

Efficient and Adaptive Content Delivery of Linear and Interactive Branched Videos

Krishnamoorthi¹

2016

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“…This includes optimized policies, improved connection/data management, and a detailed evaluation. Meixner et al [20] have also considered download and caching strategies for playback of branched video, but do not consider HAS.…”

Section: Related Workmentioning

confidence: 99%

Quality-adaptive Prefetching for Interactive Branched Video using HTTP-based Adaptive Streaming

Krishnamoorthi

Carlsson

Eager

et al. 2014

Proceedings of the 22nd ACM International Conference on Multimedia

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Interactive branched video that allows users to select their own paths through the video, provides creative content designers with great personalization opportunities; however, such video also introduces significant new challenges for the system developer. For example, without careful prefetching and buffer management, the use of multiple alternative playback paths can easily result in playback interruptions. In this paper, we present a full implementation of an interactive branched video player using HTTP-based Adaptive Streaming (HAS) that provides seamless playback even when the users defer their branch path choices to the last possible moment. Our design includes optimized prefetching policies that we derive under a simple optimization framework, effective buffer management of prefetched data, and the use of parallel TCP connections to achieve efficient buffer workahead. Through performance evaluation under a wide range of scenarios, we show that our optimized policies can effectively prefetch data of carefully selected qualities along multiple alternative paths such as to ensure seamless playback, offering users a pleasant viewing experience without playback interruptions.

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“…Moreover, seeking, preload and discharging techniques can be applied on specific file formats and keep under control the client player of the context. In [36], a solution for intelligence download and cache management of interactive non-linear video has been presented. The proposed solution aimed at minimizing the interruption when the nonlinear video changes context due to the user interaction.…”

Section: Content Modelling For Synchronized Audiovisual Rendering Viamentioning

confidence: 99%

MyStoryPlayer: experiencing multiple audiovisual content for education and training

Bellini

Nesi

Serena

2014

Multimed Tools Appl

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There are several education and training cases where multi-camera view is a traditional way to work: performing arts and news, medical surgical actions, sport actions, instruments playing, speech training, etc. In most cases, users need to interact with multi camera and multi audiovisual to create among audiovisual segments their own relations and annotations with the purpose of: comparing actions, gesture and posture; explaining actions; providing alternatives, etc. Most of the present solutions are based on custom players and/or specific applications which force to create custom streams from server side, thus leading to restrictions on the user activity as to establishing dynamically additional relations. Web based solutions would be more appreciated and are complex to be realized for the problems related to the video desynchronization. In this paper, MyStoryPlayer/ECLAP solution is presented. The major contributions to the state of the art are related to: (i) the semantic model to formalize the relationships and play among audiovisual determining synchronizations, (ii) the model and modality to save and share user experiences in navigating among lessons including several related and connected audiovisual, (iii) the design and development of algorithm to shorten the production of relationships among media, (iv) the design and development of the whole system including its user interaction model, and (v) the solution and algorithm to keep the desynchronizations limited among media in the event of low network bandwidth. The proposed solution has been developed for and it is in use within ECLAP (European Collected Library of Performing Arts) for accessing and commenting performing arts training content. The paper also reports validation results about performance assessment and tuning, and about the usage of tools on ECLAP services. In ECLAP, users may navigate in the audiovisual relationships, thus creating and sharing experience paths. The resulting solution includes a uniform semantic model, a corresponding semantic database for the knowledge, a distribution server for semantic knowledge and media, and the MyStoryPlayer Client for web applications.

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Intelligent download and cache management for interactive non-linear video

Cited by 9 publications

References 64 publications

Efficient and Adaptive Content Delivery of Linear and Interactive Branched Videos

Efficient and Adaptive Content Delivery of Linear and Interactive Branched Videos

Quality-adaptive Prefetching for Interactive Branched Video using HTTP-based Adaptive Streaming

MyStoryPlayer: experiencing multiple audiovisual content for education and training

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