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Frame Rate Exclusive Sync Management of Live Video Streams in Collaborative Mobile Production Environment
Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
2014 (Engelska)Ingår i: Proceedings of Workshop on Mobile Video Delivery, Association for Computing Machinery (ACM), 2014, s. 2-Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Association for Computing Machinery (ACM), 2014. s. 2-
Nyckelord [en]
Synchronization, production, video, mobility, live broadcast, streaming, collaborative, frame rate adjustment, network delay.
Nationell ämneskategori
Människa-datorinteraktion (interaktionsdesign)
Forskningsämne
data- och systemvetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-124241DOI: 10.1145/2594449.2579466ISBN: 978-1-4503-2707-7 (digital)OAI: oai:DiVA.org:su-124241DiVA, id: diva2:882892
Konferens
Workshop on Mobile Video Delivery (MoViD'14), Singapore, March 19 - 21, 2014
Tillgänglig från: 2015-12-16 Skapad: 2015-12-16 Senast uppdaterad: 2019-02-20Bibliografiskt granskad
Ingår i avhandling
1. Live Mobile Video Interaction: Inventing and investigating technology, formats and applications
Öppna denna publikation i ny flik eller fönster >>Live Mobile Video Interaction: Inventing and investigating technology, formats and applications
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Computer and Systems Sciences, Stockholm University, 2015
Serie
Report Series / Department of Computer & Systems Sciences, ISSN 1101-8526 ; 16-001
Nyckelord
human computer interaction, liveness, live, ambient video, mobile webcasting
Nationell ämneskategori
Människa-datorinteraktion (interaktionsdesign) Data- och informationsvetenskap
Forskningsämne
data- och systemvetenskap
Identifikatorer
urn:nbn:se:su:diva-124317 (URN)978-91-7649-324-3 (ISBN)
Disputation
2016-02-04, Lilla hörsalen, NOD-huset, Borgarfjordsgatan 12, Kista, 13:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-01-12 Skapad: 2015-12-17 Senast uppdaterad: 2020-03-24Bibliografiskt granskad

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Mughal, Mudassar AhmadJuhlin, Oskar
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