A general framework and communication protocol for the transmission of interactive media with real-time characteristics

Mauve, Martin; Hilt, Volker; Kuhmünch, Christoph; Effelsberg, Wolfgang

doi:10.1109/mmcs.1999.778559

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…In the following we give a brief overview of the characteristics of the distributed interactive media class. A more detailed discussion can be found in [9].…”

Section: Media Modelmentioning

confidence: 99%

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A generic late-join service for distributed interactive media

Vogel

Mauve

Geyer

et al. 2000

Proceedings of the Eighth ACM International Conference on Multimedia

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In this paper we present a generic late-join service for dis~buted interactive media, i.e., networked media which involve user interactions. Examples for distributed interactive media are shared whiteboards, networked computer games and distributed virtual environments. The generic late-join service allows a latecomer to join an ongoing session. This requires that the shared state of the medium is transmitted from the old participants of the session to the latecomer in an efficient and scalable way. In order to be generic and useful for a broad range of distributed interactive media, we have implemented the late-join service based on the Real Time Application Level Protocol for Distributed Interactive Media (RTP/I). All applications which employ this protocol can also use the generic late-join service. Furthermore the late-join service can be adapted to the specific needs of a given application by specifying policies for the late-join process. Applications which do use a different application level protocol than RTP/I may still use the concepts presented in this work. However, they will not be able to profit from our RTP/I based implementation.

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“…In the following we give a brief overview of the characteristics of the distributed interactive media class. A more detailed discussion can be found in [9].…”

Section: Media Modelmentioning

confidence: 99%

“…The term distributed interactive medium is used to denote a networked medium which involves user interactions with the medium itself [9]. Typical examples of distributed interactive media are shared whiteboards [3] [14], networked computer games [2], and distributed virtual environments [5].…”

Section: Introductionmentioning

confidence: 99%

A generic late-join service for distributed interactive media

Vogel

Mauve

Geyer

et al. 2000

Proceedings of the Eighth ACM International Conference on Multimedia

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“…A more formal classification of media flows is presented in [11]. That work defines interactive media to be those which can be influenced by events external to the media, and splits this definition into two: discrete interactive media are only influenced by external events, continuous interactive media also change their state over time without external interaction.…”

Section: Interactive Mediamentioning

confidence: 99%

“…For example, it has recently been suggested that RTP may provide the base for a protocol for the transport of interactive media such as shared whiteboards [ 11 ]. In this paper we provide a critical evaluation of the applicability of RTP for these applications, noting those areas where RTP is not a good fit and suggesting alternative solutions.…”

Section: Introductionmentioning

confidence: 99%

Notes on the use of RTP for shared workspace applications

Perkins

Crowcroft

2000

SIGCOMM Comput. Commun. Rev.

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“…Actualmente se está trabajando en una nueva versión de dicho protocolo (3) . En [MAU99] se propone el protocolo RTP/I como un intento de definir un perfil RTP para aplicaciones interactivas, pero que, debido a la dependencia con RTP, hereda los problemas de éste y sigue sin cumplir las expectativas de las aplicaciones interactivas. Actualmente se está trabajando en el desarrollo de dicho protocolo pero como protocolo independiente que reutiliza algunos aspectos de RTP pero adaptado a los requerimientos de las aplicaciones interactivas (4) .…”

Section: Estándares Y Protocolos Relacionados Con Las Aplicaciones Muunclassified

Especificación y evaluación de un algoritmo de sincronización de grupo de flujos multimedia

Boronat¹

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In this thesis an algorithm for Multimedia Group Synchronisation is proposed. It is based on feedback techniques and a global time reference.The algorithm solves the multimedia group synchronization problem in non critical multimedia applications, such as remote learning and telesurveillance. It includes not only inter-stream synchronization but it also guarantees the interreceiver synchronization, playing all the streams at the same time at all receivers.To cite an example, we can consider the remote learning application in which a teacher can send a film to his students and talk about it so they can work interconnected or answer him.The proposed algorithm is based on RTP/RTCP utilization, defining new RTCP data structures or even modifying the existing ones. So the devices in a multimedia application can interchange control information useful for the algorithm. It also considers a global time provided by NTP.The author presents several results from an objective and subjective evaluation. They show that the algorithm works well over point-multipoint and multipoint-multipoint communications, whit several sources and several receivers. ResumenEn la presente Tesis se presenta un algoritmo de sincronización de grupo de flujos multimedia, basado en técnicas de realimentación y la utilización de una referencia de tiempo global común a todos los sistemas involucrados en una aplicación multimedia.Dicho algoritmo trata de solucionar el problema de la sincronización de grupo de flujos en aplicaciones multimedia no críticas como, por ejemplo, las de aprendizaje a distancia o televigilancia. No sólo se ocupa de la sincronización local entre flujos en un mismo receptor, sino que garantiza también la reproducción simultánea (sincronizada), de todos los flujos en todos los receptores al mismo tiempo. Como ejemplo podríamos citar una aplicación de aprendizaje a distancia, en la que, por ejemplo, el profesor o tutor envíe un vídeo de una película (flujo de contenido almacenado) y, al mismo tiempo, en determinados instantes, pueda hacer comentarios (flujo de contenido en directo) sobre las imágenes que se están viendo de la película y los estudiantes discutir dichos comentarios o incluso contestar al profesor.El algoritmo propuesto se basa en la utilización de los protocolos RTP y RTCP, definiendo nuevas estructuras de datos de éste último y modificando algunas ya existentes, para que los equipos que se comunican puedan intercambiar información esencial para dicho algoritmo. También hace uso del protocolo NTP como referencia de tiempo global.Se presentan los resultados de una evaluación del mismo, tanto objetiva como subjetivamente, mostrando un comportamiento satisfactorio sobre configuraciones punto-multipunto y multipunto-multipunto, con varias fuentes y varios receptores de flujos multimedia. ResumAmb aquesta Tesi es presenta un algoritme de sincronització de fluxos d'informació de diferent naturalesa (multimedia), basat en tècniques de realimentació i en la utilització d'una referència de temps global comú a tots el...

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A general framework and communication protocol for the transmission of interactive media with real-time characteristics

Cited by 7 publications

References 3 publications

A generic late-join service for distributed interactive media

A generic late-join service for distributed interactive media

Notes on the use of RTP for shared workspace applications

Especificación y evaluación de un algoritmo de sincronización de grupo de flujos multimedia

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