Bandwidth smoothing techniques for stored video perform end to end workahead transmission of frames into the client playback buffer, in advance of their display times. Such techniques are very effective in reducing the burstiness of the bandwidth requirements for transmitting compressed, stored video. This paper addresses online bandwidth smoothing for a growing number of streaming video applic...

Due to the burstiness, scheduling VBR streams and yet achieving high resources utilization on a clustered video server has been considered a difficult problem. In this paper, we propose a simple but effective VBR scheduling algorithm for generating conflict-free network transmission schedules on clustered VoD systems. Experimental results show that this novel scheduling algorithm can achieve ne...

We consider streaming of video sequences over both, constant and variable bitrate channels. Our goal is to enable decoding of each video unit before exceeding its displaying deadline and, hence, to guarantee successful sequence presentation even if the media rate does not match the channel rate. In this work, we will show that the separation between a delay jitter buffer and a decoder buffer is...

As multimedia applications are becoming reality in wireless/mobile environments new analytical modelling techniques are required that can handle the variable bit-rate nature of such applications. This paper presents an analytical method to examine channel occupancy and blocking properties of radio base stations serving VBR connections. This method is based on an approximation that makes possibl...

1 SOURCE MODELING This section describes the TES source model for MPEG-coded video, used in the performance study; TES models for other video coding schemes may be found in [8]. The model was constucted as a deterministic superposition of three component source models, one each for a subsequence of I-frames, P-frames and B-frames. The component bit rates were then interleaved (superposed) in th...

Real time VBR (variable bit rate) video traffic prediction plays an important role in dynamic bandwidth allocation schemes by providing an accurate estimation of the instantaneous bandwidth requirement of VBR video traffic and it has been widely used in dynamic bandwidth allocation. A number of prediction algorithms have been proposed in the literature and they can be broadly classified into tw...

A resource allocation algorithm for variable bit rate (VBR) sources using the Dynamic Reservation TDMA (DRTDMA) medium access control protocol is proposed in this paper. DR-TDMA combines the advantages of distributed access and centralized scheduling to multiplex VBR traffic efficiently over a wireless ATM channel, and can be easily extended to integrate constant bit rate, VBR, and available bi...

Packet switching of variable-bit-rate real-time video sources is a means for efficient sharing of communication resources while maintaining uniform picture quality. Performance analysis for the statistical multiplexing of such video sources is required as a first step towards assessing the feasibility of packet video. This paper extends our earlier work in modeling video sources which have been...

The transfer of prerecorded, compressed variablebit-rate video requires multimedia services to support large fluctuations in bandwidth requirements on multiple time scales. Bandwidth smoothing techniques can reduce the burstiness of a VBR(Variab1e Bit Rate) stream by transmitting data at a series of f i e d rates, simplifgzng the allocation of resources in video servers and the communication ne...

This paper presents a variable bit rate ADP-CELP (Adaptive Density Pulse Code Excited Linear Prediction) coder that selects one of four kinds of coding structure in each frame based on short time speech characteristics. To improve speech quality and reduce the average bit rate, we have developed a speech/non-speech classification method using spectrum envelope variation, which is robust for bac...