1,720,957 research outputs found
A Holistic Approach to Understand HTTP Adaptive Streaming
No full textHTTP adaptive streaming is a demanding application requiring high throughput and low latency, with consumers expecting an ever-increasing quality of experience. This doctoral study proposes a novel methodology to analyze and guarantee these requirements through the establishment of a holistic cross-layer application view. By significantly increasing the amount of data points and sources available as well as combining them into a unified representation, the proposed holistic point of view facilitates root cause analysis. At the same time, it can support or even automate analysis of various (sub)processes in the end-to-end chain. Potential cross-layer optimizations in the workflow are also more easily identified and analyzed.Mike Vandersanden (BOF22OWB17) is a Ph.D. candidate at Hasselt University, supported by the Special Research Fund (BOF) and supervised by Prof. Peter Quax and Prof. Wim Lamotte. The author would like to thank Wouter Lemoine for reviewing earlier versions of this work
A Holistic Approach to Understand HTTP Adaptive Streaming
No full textHTTP adaptive streaming is a demanding application requiring
high throughput and low latency, with consumers expecting an
ever-increasing quality of experience. This doctoral study proposes
a novel methodology to analyze and guarantee these requirements
through the establishment of a holistic cross-layer application view.
By significantly increasing the amount of data points and sources
available as well as combining them into a unified representation,
the proposed holistic point of view facilitates root cause analysis.
At the same time, it can support or even automate analysis of
various (sub)processes in the end-to-end chain. Potential cross-
layer optimizations in the workflow are also more easily identified
and analyzed
A Holistic Approach to Understand HTTP Adaptive Streaming
No full textHTTP adaptive streaming is a demanding application requiring
high throughput and low latency, with consumers expecting an
ever-increasing quality of experience. This doctoral study proposes
a novel methodology to analyze and guarantee these requirements
through the establishment of a holistic cross-layer application view.
By significantly increasing the amount of data points and sources
available as well as combining them into a unified representation,
the proposed holistic point of view facilitates root cause analysis.
At the same time, it can support or even automate analysis of
various (sub)processes in the end-to-end chain. Potential cross-
layer optimizations in the workflow are also more easily identified
and analyzed
Real-time analytics of concurrent adaptive video streams using next-generation protocols
No full textVideostreaming is een aanzienlijk deel van de dagelijkse activiteit op internet. Met een groeiend aantal gebruikers wordt streaming via het HyperText Transfer Protocol (HTTP) de populaire streamingmethode. HTTP Adaptive Streaming (HAS) biedt de mogelijkheid om zich aan het passen aan het netwerk door beslissingen te nemen wanneer het netwerk zich anders begint te gedragen. Een ander voordeel van over HTTP te streamen is de mogelijkheid om gebruik te maken van de bestaande oplossingen die de prestaties van HTTP verbeteren. Door gebruik te maken van een nieuwere netwerkprotocollen, kunnen de prestaties van HAS verder worden verbeterd. Streaming met behulp van de nieuwer protocollen HTTP/3 en QUIC kan bepaalde fouten wegwerken in de meer traditionele oplossing.
Een streamingapplicatie maakt een verschillende datapunten aan tijdens de streamingsessie, die kunnen worden geanalyseerd. Deze thesis stelt een analyseprogramma voor die de data van applicaties live kan opnemen en op interessante manieren kan visualiseren. De evaluatie van deze thesis koppelt het voorgestelde analyseprogramma aan een raamwerk om applicaties te testen. Dit raamwerk zorgt ervoor dat testen worden uitgevoerd, en de data van de applicaties kan dan geanalyseerd worden door het analyseprogramma. Het resultaat is niet alleen de mogelijkheid om de sessie van meerdere applicaties te analyseren, maar ook om gebeurtenissen van externe krachten af te leiden, zoals andere apparaten die tussen de applicatie en de server staan
Real-time analytics of concurrent adaptive video streams using next-generation protocols
No full textVideostreaming is een aanzienlijk deel van de dagelijkse activiteit op internet. Met een groeiend aantal gebruikers wordt streaming via het HyperText Transfer Protocol (HTTP) de populaire streamingmethode. HTTP Adaptive Streaming (HAS) biedt de mogelijkheid om zich aan het passen aan het netwerk door beslissingen te nemen wanneer het netwerk zich anders begint te gedragen. Een ander voordeel van over HTTP te streamen is de mogelijkheid om gebruik te maken van de bestaande oplossingen die de prestaties van HTTP verbeteren. Door gebruik te maken van een nieuwere netwerkprotocollen, kunnen de prestaties van HAS verder worden verbeterd. Streaming met behulp van de nieuwer protocollen HTTP/3 en QUIC kan bepaalde fouten wegwerken in de meer traditionele oplossing.
Een streamingapplicatie maakt een verschillende datapunten aan tijdens de streamingsessie, die kunnen worden geanalyseerd. Deze thesis stelt een analyseprogramma voor die de data van applicaties live kan opnemen en op interessante manieren kan visualiseren. De evaluatie van deze thesis koppelt het voorgestelde analyseprogramma aan een raamwerk om applicaties te testen. Dit raamwerk zorgt ervoor dat testen worden uitgevoerd, en de data van de applicaties kan dan geanalyseerd worden door het analyseprogramma. Het resultaat is niet alleen de mogelijkheid om de sessie van meerdere applicaties te analyseren, maar ook om gebeurtenissen van externe krachten af te leiden, zoals andere apparaten die tussen de applicatie en de server staan
Adaptive Web-Based VR Streaming of Multi-LoD 3D Scenes via Author-Provided Relevance Scores
No full textThe growing storage requirements of 3D virtual scenes, combined with the increased heterogeneity of consumption devices, trigger the need for novel, on-demand streaming techniques of textured meshes. This paper proposes a way to perform relevance-aware Adaptive Bit-Rate (ABR) scheduling using MPEG-DASH, tailored to VR consumption in the web browser. Scene authors can annotate the relative importance of scene assets to optimize scheduling decisions. Our approach outperforms the state-of-the-art (measured using the MS-SSIM metric) across different scene complexities and network configurations, and is found to be most beneficial when scene complexity is high and network conditions are relatively poor.IEEE; IEEE Comp Soc; Virbela; Tecnico Lisboa; Immers Learning Res Network; Qualcomm; Vicon; HitLabNZ AIGI; Microsoft; Appen; Facebook Real Labs Res; XR Bootcamp; NSF; Fakespace Lab
Vegvisir: A testing framework for HTTP/3 media streaming
No full textAssessing media streaming performance traditionally requires the presence of reproducible network conditions and a heterogeneous dataset of media materials. Setting up such experiments represents a complex challenge in itself. This challenge becomes even more complex when we consider the new QUIC transport protocol, which has many tunable features, yet is difficult to analyze due to its inherent encrypted nature. In this paper, we introduce Vegvisir, which aims to solve these aforementioned challenges by providing an open-source automated testing framework for orchestrating media streaming experiments over HTTP/3. We describe how users can steer the behavior of Vegvisir through its configuration system. We provide a high-level overview of its inner workings and its broad applicability by describing two use cases: one covering sizeable experiments spanning multiple days and another covering HAS evaluation scenarios.Joris Herbots (BOF19OWB07) and Mike Vandersanden (BOF22OWB17) are Ph.D. candidates at Hasselt University, supported by the Special Research Fund (BOF). Special thanks go to Olaf Van Bylen for his work on exploring front-ends for Vegvisir. The research leading to the results in Section 5.2 has received funding from the European Union’s Horizon Europe Programme under grant agreement 101070072, MAX-R (Mixed Augmented and eXtended Reality media pipeline)
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
