Data modeling of time-based media

Meeting, to discuss and share information, take decisions and allocate tasks, is a central aspect of human activity. Computer mediated communication offers enhanced possibilities for synchronous collaboration by allowing seamless capture of meetings, thus relieving participants from time-consuming documentation tasks. However, in order for meeting systems to be truly effective, they must allow users to efficiently navigate and retrieve information of interest from recorded meetings. In this article, we review the state of the art in multimedia segmentation, indexing and browsing techniques and show how existing meeting browser systems build on these techniques and integrate various modalities to meet their users' information needs.

Section: Meeting Browsersmentioning

confidence: 99%

Meeting browsing

Bouamrane

Luz

2006

“…Studies have investigated the modeling of the synchronization aspects of multimedia data from a conceptual perspective, including graphical models, Petri-Net-based models, object-oriented models, and temporal abstraction models [10,11,20,22]. These models provide illustrative vehicles for specifying synchronization semantics at the application level.…”

Section: Related Workmentioning

confidence: 99%

“…3. Interaction of client threads tured BLOB (binary large objects) which can be further categorized within several higher level object classes [11,22]. Objects from different media streams may also be spatiotemporally combined into multimedia objects.…”

Section: Data and Presentationsmentioning

confidence: 99%

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Dynamic playout scheduling algorithms for continuous multimedia streams

Johnson

Zhang

1999

In this paper, we investigate a playout scheduling framework for supporting the continuous and synchronized presentations of multimedia streams in a distributed multimedia presentation system. We assume a situation in which the server and network transmissions provide sufficient support for the delivery of media objects. In this context, major issues regarding the enforcement of the smooth presentation of multimedia streams at client sites must be addressed to deal with rate variance of stream presentations and delay variance of networks. We develop various playoutscheduling algorithms that are adaptable to quality-of-service parameters. The proposed algorithms permit the local adjustment of unsynchronized presentations by gradually accelerating or retarding presentation components, rather than abruptly skipping or pausing the presentation materials. A comprehensive experimental analysis of the proposed algorithms demonstrates that our algorithms can effectively avoid playout gaps (or hiccups) in the presentations. This scheduling framework can be readily used to support customized multimedia presentations.

“…At the lowest level, a media stream is viewed as an unstructured BLOB (binary large object) which can be further categorized within several higher level object classes [Mas91,EM94,CAF+91,GBT94]. Objects from different media streams may also be spatio-temporally combined into multimedia objects.…”

Section: The Data Modelmentioning

confidence: 99%

Buffer model and management in distributed multimedia presentation systems

Gollapudi

Zhang

1998

The delivery of continuous and synchronous multimedia data from a database (or file) server to multiple destinations over a network presents new challenges in the area of buffer management. Many factors that were not considered in conventional buffer management must be examined. In this paper, we investigate the principles of buffer model and management for multimedia data presentations in distributed systems. The primary goal is to minimize the response time of multimedia presentations while ensuring that all continuity and synchronization requirements are satisfied. A framework for buffer model and management is introduced. Minimum buffering requirements at both client and server sides to guarantee the continuity and synchrony of the presentation of multimedia data are examined. A prefetching and replacement strategy which satisfies these requirements is then offered. These principles and techniques provide users with the full range of information required to develop a distributed system for multimedia presentations.