Presentation scheduling of multimedia objects and its impact on network and operating system support

Hoepner, Petra

doi:10.1007/3-540-55639-7_12

Cited by 14 publications

(12 citation statements)

References 15 publications

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“…Several interactive tools help to define time relations (Littman and Morgan 1991;Blakowski et al 1991). These tools rely on synchronization specification methods that can be grouped into four classes: hierarchical synchronization (AFNOR Expert Group 1989), synchronization at a common time line (Blakowski et al 1991;Tsichritzis et al 1991;Hodges et al 1989), and in Quicktime (Littman and Morgan 1991) synchronization at references points and event-based synchronization (Hoepner 1991). Specification and realization of synchronization is combined by Little and Ghafoor (1990) and Woo et al (1994).…”

Section: Time Relations Between Sequencesmentioning

confidence: 98%

Continuous media described by time-dependent data

Fritzsche

1995

Multimedia Systems

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Abstract. Time-dependent data, defined by the attributes start time and duration can describe continuous media. A short theoretical analysis of sets of time-dependent data forms the first part of this paper. The results are three normal forms of continuous media data. In the second part, a data model for continuous media called Sequence is defined according to the theory presented. Not only does this model implement the data structure, it also inculdes operations that apply generally to continuous media data. The third part of the paper is a short overview showing how to integrate time-dependent data as Sequences into database systems.

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Section: Time Relations Between Sequencesmentioning

confidence: 98%

Continuous media described by time-dependent data

Fritzsche

1995

Multimedia Systems

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“…This temporal extent is called the presentation frame. According to the temporal relation between actions contained in a presentation frame, the presentation frame types can be classified [Hoep91a,Hoep91b,LiGh93] as follows (In Sect. 7, based on Hoepner's classification, we define presentation organization constraints):…”

Section: A Brief Survey Of Presentation-related Researchmentioning

confidence: 99%

“…A presentation manager is mainly concerned with the specification of presentation behavior and identification of temporal relations between the presented multimedia objects [Hoep91a,LiGh93]. A multimedia computing system supports the integration and synchronization of different kinds of media.…”

Section: A Brief Survey Of Presentation-related Researchmentioning

confidence: 99%

Constraint-based automation of multimedia presentation assembly

1999

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In this paper, we present a methodology for automated construction of multimedia presentations. Semantic coherency of a multimedia presentation is expressed in terms of presentation inclusion and exclusion constraints. When a user specifies a set of segments for a presentation, the multimedia database system adds segments into and/or deletes segments from the set in order to satisfy the inclusion and exclusion constraints. We discuss the consistency and the satisfiability of inclusion and exclusion constraints when exclusion is allowed. Users express a presentation query by (a) pointing and clicking to an initial set of desired multimedia segments to be included into the presentation, and (b) specifying an upper bound on the time length of the presentation. The multimedia database system then finds the set of segments satisfying the inclusion-exclusion constraints and the time bound. Using priorities for segments and inclusion constraints, we give two algorithms for automated presentation assembly and discuss their complexity. To automate the assembly of a presentation with concurrent presentation streams, we introduce presentation organization constraints that are incorporated into the multimedia data model, independent of any presentation. We define four types of presentation organization constraints that, together with an underlying database ordering, allow us to obtain a unique presentation graph for a given set of multimedia segments. We briefly summarize a prototype system that fully incorporates the algorithms for the segment selection problem.

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“…These components include 1) an operating system with the capability to process media data with timing constraints ( ego Bollella, (1995) Coulson (1991, Williams (1992), Arbab (1993» high level powerful constructs for defining a whole range of synchronisation constraints (eg. Staehli (1994), Gibbs (1991», and Berra (1992» reliable network transport services for moving time-constrained media data (Hoepner (1991), Williams (1992), Anderson (1990». In this paper, we concentrate on advances in operating system (OS) design which may lead to improvements in processing time-constrained media data. The paper is organised as follows: Firstly, we discuss the aspects of multimedia applications.…”

mentioning

confidence: 99%

“…One of the most important issues is that of synchronisation. Multimedia applications need sophisticated support for presentation scheduling (Hoepner (1991» as well as for maintaining real-time processing of continuous media (Coulson (1992». …”

mentioning

confidence: 99%