Retrieval schedules based on resource availability and flexible presentation specifications

Abstract

A distributed multimedia document presentation involves retrieval of objects from one or more document servers and their presentation at the client system. The presentation of the multimedia objects has to be carried out in accordance with the specification of temporal relationships between the objects. The retrieval of multimedia objects from the document server(s) is influenced by factors such as temporal specification of objects presentations, throughput offered by the network service provider, and the buffer resources on the client system. Flexibility in the temporal specification of the multimedia document may help in deriving an object retrieval schedule that can handle variations in network throughput and buffer resource availability. In this paper, we develop techniques for deriving a flexible object retrieval schedule for a distributed multimedia document presentation. The schedule is based on flexible temporal specification of the multimedia document using the difference constraints approach. We show how the derived retrieval schedule can be validated and modified to ensure that it can work with the offered network throughput and the available buffer resources.

Managing adaptive presentation executions in distributed multimedia database systems

“…[7,3,1]. We have reflected this in our proposal for PB-RPM by assuming a model (referred to as a presentation quality-based control model) which organizes the cooperation of the following processes according to a producer/consumer concept ( Figure 1).…”

“…More elaborate ideas based on [2] are presented in [4]. Also in [1], work on the adaptive execution of multimedia presentations is described. In particular, it proposes Presentation and Retrieval Schedules.…”

“…As part of our further joint research work, we will especially investigate how we can exploit this model of presentation quality for the purpose of PB-RPM in distributed MM-DBS. The notion of presentation quality is also considered in [1] in which the quality is dependent on the response time of the presentation and the quality of the objects.…”

Pré-Busca De Conteúdo Em Apresentações Multimídia

“…O objetivo deste trabalho é construir um plano de pré-busca a fim de reduzir (Candan et al 1998;Steinmetz 1996 SB1 0,0 2,0 T1 and T1 SB2 2,0 2,0 V1 SB3 4,0 2,0 T2 SB4 6,0 1,0 T2 and A1 SB5 7,0 2,0 T2, A1 and I2 SB6 8,0 1,0 A1 and I2 Kleinberg & Tardos (2005).…”

“…Essas instâncias temporais e os tempos de duração dos objetos de mídia podem ser especificados tanto de maneira rígida como de maneira flexível (Candan et al 1998  0,1 segundos é o tempo limite para conseguir, no usuário, uma sensação de que o sistema reage de forma instantânea.…”