This paper describes the design and implementation of a le server for variable bit rate continuous media. Most continuous media le servers have been designed for constant bit rate streams. We address the problem of building a server where each stream may have a diierent bit rate and, more importantly, where the bit rate within a single stream may vary considerably. Such servers will be come inc...

Bit rate control allows the transformation of a variable rate bit stream into a constant bit rate one for storage or transmission using devices with fixed bandwidth. In this paper, a constant bit rate MPEG 2 coder is analysed and, based in this analysis, several considerations are presented regarding the development of a constant bit rate control algorithm.

Video might constitute a sizeable part of the traffic in future broadband networks. It is consequently important to consider the requirements of video and its characteristics in order to properly design and dimension the networks. Despite a massive amount of research on video source models and multiplexing performance, there are few results that are applicable to real sources and networks. For ...

In this paper, we use prediction algorithms to estimate the behavior of VBR video traac based on statistical short-term earthquake prediction methods. The probabilistic estimation of future inter-arrival times of peak values of MPEG-VBR video stream is considered in terms of Bayes theorem, and the Bayesian analysis of peak rate sample is evaluated on the basis of the proportion of successes rat...

The tra c generated by multimedia applications presents a high degree of burstiness that can hardly be described by a static set of tra c parameters. We present a dynamic QoS negotiation scheme applied to a prototype application that provides temporized data transfer. The dynamic and e cient usage of the resources can be reached with the introduction of the renegotiable variable bit rate (RVBR)...

We propose models for variable bit rate (VBR) video traffic that allow for different frame types present in the video, different activity levels of different frames and a variable group of pictures (GOP) structure. We use doubly Markov processes to capture these properties. The performance of these models is evaluated in terms of the stochastic properties of the generated trace as well as using...

In this paper we discuss issues related to the storage and retrieval of Variable Bit Rate (VBR) MPEG video data on parallel disk arrays for multiple simultaneous users. We store data blocks corresponding to constant real-time playback duration. Because of the VBR characteristics and the constant band-width read channel, disk overload occurs at peak usage periods. Our strategy to deal with disk ...

Many MPEG-2 encoding applications are realtime; this implies that the video signal must be encoded with no significant lookahead. However, there exist non-real-time applications that do enable us to first analyze a video sequence entirely, and, using the analysis results, to optimize a second encoding pass of the same data. One example of such an application is the digital video disk (DVD), whi...