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Live Mobile Video Interaction: Inventing and investigating technology, formats and applications
Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. MobileLife@Stockholm University.
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The convergence of inexpensive video-enabled mobile phones, high-speed mobile data networks and ubiquitous sensing devices opens up a new design space called “live mobile video interaction”. It gives rise to a new genre of applications concerning live mobile video production, which can be seen as an instance of the said space. In this work we are particularly interested to explore potential technical challenges and opportunities presented by “live mobile video interaction”. We started our investigation by studying two existing prototypes from the said genre i.e. the Instant Broadcasting System (IBS) and the Mobile Vision Mixer (MVM). We studied their applicability for amateur users of collaborative mobile video production tools and the problems caused by inherent communication delays in the Internet. We acquired initial user feedback and conducted technical tests on Instant Broadcasting System (IBS) and Mobile Vision Mixer (MVM). Our results indicate that lack of synchronisation among video streams causes problems for directors in such systems that were not present in professional systems. We also identified two distinct video production modes depending on visual access of the director to the event that is being filmed. Based on our study we proposed technical design suggestions and indications on how to solve the synchronisation problems in respective mixing modes. We also proposed an algorithm for frame-rate exclusive synchronisation management of live streams in a collaborative mobile production environment. We further probed the design space using the research through design method, which resulted in a fully functional prototype system called “Livenature” that would incite an emotional connection that exists between people and the places they cherish. Further investigation of Livenature allowed us to produce detailed studies about experiential and technical aspects of the system, thus revealing phenomenological and technical dimensions of the design space.

Place, publisher, year, edition, pages
Stockholm: Department of Computer and Systems Sciences, Stockholm University , 2015.
Series
Report Series / Department of Computer & Systems Sciences, ISSN 1101-8526 ; 16-001
Keyword [en]
human computer interaction, liveness, live, ambient video, mobile webcasting
National Category
Human Computer Interaction Computer and Information Science
Research subject
Computer and Systems Sciences
Identifiers
URN: urn:nbn:se:su:diva-124317ISBN: 978-91-7649-324-3 (print)OAI: oai:DiVA.org:su-124317DiVA: diva2:884962
Public defence
2016-02-04, Lilla hörsalen, NOD-huset, Borgarfjordsgatan 12, Kista, 13:00 (English)
Opponent
Supervisors
Available from: 2016-01-12 Created: 2015-12-17 Last updated: 2015-12-22Bibliographically approved
List of papers
1. Experiencing Liveness of a Cherished Place in the Home
Open this publication in new window or tab >>Experiencing Liveness of a Cherished Place in the Home
2015 (English)In: Proceedings of the ACM International Conference on Interactive Experiences for TV and Online Video, Association for Computing Machinery (ACM), 2015, 3-12 p.Conference paper, Published paper (Refereed)
Abstract [en]

Liveness, as discussed in HCI and in media studies, focuses on an intriguing and beloved experiential quality that can influence new forms of video applications. We suggest a shift from accounts of liveness in "events" to liveness in ambient media for home décor by designing a system called TransLive that exploits the "magic" of mediatizing the "now" at a distant and cherished place. We present an interview study including four families, who experienced the system for two weeks each in a concept apartment setting. It shows how immediacy and unpredictability provide compelling experiences. Authenticity and engagement, which are previously considered as inherent qualities in live media, instead occur in the context of use. Finally, the experience of transcendence triggered by slow and continuous video streams open up a new design space of liveness. Thus, not only do we take inspiration from liveness theory, but we also need to redefine it.

Place, publisher, year, edition, pages
Association for Computing Machinery (ACM), 2015
Keyword
Liveness, mobile webcasting, ambient media, design, home
National Category
Human Computer Interaction
Research subject
Computer and Systems Sciences
Identifiers
urn:nbn:se:su:diva-124243 (URN)10.1145/2745197.2745198 (DOI)978-1-4503-3526-3 (ISBN)
Conference
The ACM International Conference on Interactive Experiences for TV and Online Video (TVX'15), Brussels, Belgium, June 03 - 05, 2015
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2017-12-15Bibliographically approved
2. Juxtaposing mobile webcasting and ambient video for home décor
Open this publication in new window or tab >>Juxtaposing mobile webcasting and ambient video for home décor
2014 (English)In: Proceedings of the 13th International Conference on Mobile and Ubiquitous Multimedia, New York: Association for Computing Machinery (ACM), 2014, 151-159 p.Conference paper, Published paper (Refereed)
Abstract [en]

In order to invent and investigate new approaches for the use of enjoying live video, we suggest a combination of emerging mobile webcasting with artistic ambient video, which would enable a form of user generated broadcasts from individually selected cherished places for home decoration. Drawing on the approach of Research through Design we present a study of people who have occasional access to highly appreciated geographical locations, a design instantiation and prototype called LiveNature, as well as a system implementation. We present the result of a technical evaluation, which was conducted during two weeks of deployment. It shows that mobile webcasting provide continuous and stable streams of such a quality that it can be presented for home decoration, and that the video can be combined with real time sensor data to generate aesthetically interesting hybrid media. We also learned that the use of mobile webcasting for home decoration raises new challenges in order to provide unobtrusive and glance based interaction.

Place, publisher, year, edition, pages
New York: Association for Computing Machinery (ACM), 2014
National Category
Information Systems
Research subject
Computer and Systems Sciences
Identifiers
urn:nbn:se:su:diva-111851 (URN)10.1145/2677972.2677988 (DOI)978-1-4503-3304-7 (ISBN)
Conference
The 13th International Conference on Mobile and Ubiquitous Multimedia, Melbourne, Australia, 25-28 November, 2014
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2017-12-15Bibliographically approved
3. Context-dependent software solutions to handle video synchronization and delay in collaborative live mobile video production
Open this publication in new window or tab >>Context-dependent software solutions to handle video synchronization and delay in collaborative live mobile video production
2014 (English)In: Personal and Ubiquitous Computing, ISSN 1617-4909, E-ISSN 1617-4917, Vol. 18, no 3, 709-721 p.Article in journal (Refereed) Published
Abstract [en]

The advent of modern mobile phones, 3G networks, and live video streaming has made it possible to broadcast live video from mobile devices. This is now giving rise to a new class of applications which enable mobile collaborative live video production, in which groups of amateurs work together to provide a rich broadcast of events. We focus on new and expected synchronization problems that arise in these more complex systems when broadcasting live events because of the delays that often occur in streaming over internet and mobile networks. The problem has been investigated by acquiring initial user feedback, as well as conducting technical delay measurements of two examples of such systems and relating them to existing literature. We identified two types of technical problems which affect the mixing of the streams, namely the difference in delay in multiple streams, a.k.a. asynchrony among streams, and the delay between the event itself and its presentation in the mixer. These problems affect the mixing in various ways depending on whether or not the director has visual access to the unmediated event. This knowledge has then been used to inform the conceptualization of identifiable ways of handling delays and synchronization. We suggest the introduction of a software feature providing context-dependent delay, in which these requirements can be balanced differently to fit specific contexts of use. We specifically address the different types of mixing which occurs when the director, or mixer, only has access to the topic through the mobile media (“out of view”), as well as mixing in a context in which the topic also is physically present (“in-view”) in front of the mixer.

Keyword
Webcasting, Live video, Synchronization, Asynchrony delay, Mixing, Collaboration
National Category
Information Systems
Research subject
Computer and Systems Sciences
Identifiers
urn:nbn:se:su:diva-97718 (URN)10.1007/s00779-013-0701-z (DOI)000331801500020 ()
Available from: 2013-12-17 Created: 2013-12-17 Last updated: 2017-12-06Bibliographically approved
4. Frame Rate Exclusive Sync Management of Live Video Streams in Collaborative Mobile Production Environment
Open this publication in new window or tab >>Frame Rate Exclusive Sync Management of Live Video Streams in Collaborative Mobile Production Environment
2014 (English)In: Proceedings of Workshop on Mobile Video Delivery, New York: Association for Computing Machinery (ACM), 2014, nr 2- p.Conference paper, Published paper (Refereed)
Abstract [en]

We discuss synchronization problem in an emerging type of multimedia applications, called live mobile collaborative video production systems. The mobile character of the production system allows a director to be present at the site where he/she can see the event directly as well as through the mixer display. In such a situation production of a consistent broadcast is sensitive to delay and asynchrony of video streams in the mixer console. In this paper, we propose an algorithm for this situation called "frame rate exclusive sync manager", which draws on existing reactive source control synchronization techniques. It relies solely on frame-rate control and maintains synchronization between live video streams while ensuring minimal delay by dynamically adapting the frame-rate of the camera feeds based on synchronization offset and network bandwidth health. The algorithm is evaluated by simulation which indicates algorithm's capability of achieving increased synchronization among live streams.

Place, publisher, year, edition, pages
New York: Association for Computing Machinery (ACM), 2014
Keyword
Synchronization, production, video, mobility, live broadcast, streaming, collaborative, frame rate adjustment, network delay.
National Category
Human Computer Interaction
Research subject
Computer and Systems Sciences
Identifiers
urn:nbn:se:su:diva-124241 (URN)10.1145/2579465.2579466 (DOI)978-1-4503-2707-7 (ISBN)
Conference
Workshop on Mobile Video Delivery (MoViD'14), Singapore, March 19 - 21, 2014
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2016-01-04Bibliographically approved
5. Resource efficient live ambient video
Open this publication in new window or tab >>Resource efficient live ambient video
2016 (English)Conference paper, Published paper (Refereed)
Keyword
Ambient video, mobile webcasting, live, energy efficiency, network efficiency
National Category
Information Systems
Research subject
Computer and Systems Sciences
Identifiers
urn:nbn:se:su:diva-124315 (URN)
Conference
The 10th International Conference on Multimedia and Ubiquitous Engineering (MUE2016), Beijing, China, April 20-22, 2016
Available from: 2015-12-17 Created: 2015-12-17 Last updated: 2017-08-17

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