Nowadays, we are witnessing a transition from physical togetherness towards
networked togetherness around media content. Novel forms of shared media
experiences are gaining momentum, allowing geographically distributed users to
concurrently consume the same media content while socially interacting (e.g., via
text, audio or video chat). Relevant use cases are, for example, Social TV, networked
games and multi-party conferencing.
However, realizing enjoyable shared media services faces many challenges. In
particular, a key technological enabler is the concurrent synchronization of the
media playout across multiple locations, which is known as Inter-Destination
Multimedia Synchronization (IDMS).
This PhD thesis presents an inter-operable, adaptive and accurate IDMS solution,
based on extending the capabilities of RTP/RTCP standard protocols (RFC 3550).
Concretely, two new RTCP messages for IDMS have been defined to carry out the
necessary information to achieve IDMS. Such RTCP extensions have been
standardized within the IETF, in RFC 7272. In addition, novel standard-compliant
Early Event-Driven (EED) RTCP feedback reporting mechanisms have been also
designed to enhance the performance in terms of interactivity, flexibility, dynamism
and accuracy when performing IDMS.
The designed IDMS solution makes use of globally synchronized clocks (e.g.,
using NTP) and can adopt different (centralized and distributed) architectural
schemes to exchange the RTCP messages for IDMS. This allows efficiently
providing IDMS in a variety of networked scenarios and applications, with different
requirements (e.g., interactivity, scalability, robustness…) and available resources
(e.g., bandwidth, latency, multicast support…). Likewise, various monitoring and
control algorithms, such as dynamic strategies for selecting the reference timing to
synchronize with, and fault tolerance mechanisms, have been added. Moreover, the
proposed IDMS solution includes a novel Adaptive Media Playout (AMP)
technique, which aims to smoothly adjust the media playout rate, within
perceptually tolerable ranges, every time an asynchrony threshold is exceeded.
Prototypes of the IDMS solution have been implemented in both a simulation
and in real media framework. The evaluation tests prove the consistent behavior and
the satisfactory performance of each one of the designed components (e.g.,protocols, architectural schemes, master selection policies, adjustment
techniques…). Likewise, comparison results between the different developed
alternatives for such components are also provided. In general, the obtained results
demonstrate the ability of this RTP/RTCP-based IDMS solution to concurrently and
independently maintain an overall synchronization status (within allowable limits)
in different logical groups of users, while avoiding annoying playout discontinuities
and hardly increasing the computation and traffic load. / Montagut Climent, MA. (2015). DESIGN, DEVELOPMENT AND EVALUATION OF AN ADAPTIVE AND STANDARDIZED RTP/RTCP-BASED IDMS SOLUTION [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/48549 / TESIS / Premios Extraordinarios de tesis doctorales
| Identifer | oai:union.ndltd.org:upv.es/oai:riunet.upv.es:10251/48549 |
| Date | 31 March 2015 |
| Creators | Montagut Climent, Mario Alberto |
| Contributors | Boronat Segui, Fernando, César García, Pablo Santiago, Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions |
| Publisher | Universitat Politècnica de València |
| Source Sets | Universitat Politècnica de València |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis, info:eu-repo/semantics/acceptedVersion |
| Rights | http://rightsstatements.org/vocab/InC/1.0/, info:eu-repo/semantics/openAccess |
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