The Design And Implementation Of A Real Time Multimedia Synchronization Control System Over High Speed Communications Networks
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The Design and Implementation of a Real-time Multimedia Synchronization Control System Over High-speed Communications Networks
Sychronization is considered as a key issue in distributed multimedia systems. In a real-time multimedia presentation, data objects of different media types or coding formats are delivered from distributed media-storing servers to the remote client simultaneously over high-speed networks. The multiple streams need to be synchronized so that the multimedia document can be presented in the way specified by its creator. The synchronization research involves issues such as temporal relationship modeling, extending network protocols and supporting the implementation of applications where the synchronization control mechanisms integrate with other system functionality, such as the ATM network transmissions. The video coding/decoding and the distributed database management. In this thesis, we investigate a software synchronization control system for a target presentational application, i.e., a Multimedia News-on-demand service. Relying on the Quality of Services (QoS) supported by the ATM-based virtual connections, the system prevents major multi-stream mismatches through a delivery scheduling operation. Moreover, the synchronization errors brought by the inevitable network delay variations are recovered through a Stream Synchronization Protocol (SSP) in order to preserve the presentation quality. We apply the Time Flow Graph (TFG) to model the temporal relationships among the media components so that the scheduling and recovering operations can be efficient. Synchronization QoS parameters are employed in the SSP control. In addition, the differences between the characterization of coded and uncoded data streams are taken into account. We present a priority-based synchronization control for coded data, e.g., the MPEG-2 video stream. For the implementation of such a control system, we elaborate a set of data structure specifications and algorithms. As well, we develop the software modules to implement the synchronization control prototype.
The Practical Real-Time Enterprise
Author: Bernd Kuglin
language: en
Publisher: Springer Science & Business Media
Release Date: 2005-08-15
Speed as a factor for success Our modern industrial society lives life in the fast lane. The catchwords “faster”, “shorter”, “more powerful” reflect what we experience in almost all aspects of our lives. Whether at home or at work, we are constantly on the move and in a rush. In our private lives we find rapid exchange of inf- mation most entertaining and we are fascinated by the wide range of inf- mation that pours in on us from all around the world, mainly via the new media. It gives us the feeling of being a part of the action everywhere and all the time. Seldom are we aware that the only reason this flood of inf- mation, often referred to as “overstimulation”, does not lead to overkill is that we manage to organize our time effectively. There are many parallels to this in the business world. Here too, a great deal of time pressure is exerted from outside; goals are set ever higher and deadlines become tighter. In other words, demands on our time demand faster reaction. Crucial information travels around the globe – across all time zones – in a matter of seconds. In fact, instead of CET or CEST, it would make sense to have a single time zone for the worldwide network called GST for Global Simultaneous Time. In business more so than in p- vate life, we are almost constantly online.
The Design and Implementation of a Real-time Multimedia Synchronization Control System Over High-speed Communication Networks
For the implementation of such a control system, we elaborate a set of data structure specifications and algorithms. As well, we develop the software modules to implement the synchronization control prototype.