Showing papers by "Carsten Griwodz published in 2004"
TL;DR: To handle the server load imposed by increased user access to on-demand multimedia streaming applications, new storage system solutions are needed to deal with the increasing speed mismatch.
Abstract: A multimedia storage system plays a vital role for the performance and scalability of multimedia servers. To handle the server load imposed by increased user access to on-demand multimedia streaming applications, new storage system solutions are needed. Multimedia storage systems store and retrieve data from storage devices and manage related issues including data placement, scheduling, file management, continuous data delivery, memory buffering, and prefetching. For high-data-rate multimedia systems, storage systems have long been viewed as a primary bottleneck for two reasons. First, multimedia applications have a much higher storage system load than previous applications. Second, storage devices have become only marginally faster compared to increased processor and network performance. This increasing speed mismatch has fueled a search for new storage structures and file system storage and retrieval mechanisms
14 citations
TL;DR: A proxy's perspective in an architecture that supports efficient distribution of recorded video data in today's Internet and solutions to improve the performance are discussed, mainly from the perspective of a proxy cache.
Abstract: This article describes a proxy's perspective in an architecture that supports efficient distribution of recorded video data in today's Internet. The support of layer-encoded video streaming with the aid of proxies enables a video distribution infrastructure that is efficient in today's Internet, and allows new mechanisms and techniques to be leveraged in a future Internet. An overview of a scalable and adaptive streaming architecture is presented. Open problems in the distribution and caching process are identified. Throughout the article solutions to improve the performance of such a video distribution architecture are discussed, mainly from the perspective of a proxy cache. The investigations that led to these solutions are based on an empirical experiment with layer encoded video. The goal of this experiment was to understand the effect of varying the number of layers on the viewer's perceived quality. The results of this initial investigation can be seen as the foundation for subsequent studies on mechanisms that improve the transport and caching of layer-encoded video in a scalable adaptive streaming architecture.
11 citations
TL;DR: To meet multimedia servers' increasing performance and scalability requirements, researchers must design multimedia storage system components that adapt to various workloads and requirements.
Abstract: To meet multimedia servers' increasing performance and scalability requirements, researchers must design multimedia storage system components that adapt to various workloads and requirements. They must also develop strategies for combining components into a single high-performance system.
3 citations
TL;DR: This work utilizes a priori knowledge about news articles’ structure encoded in a presentation plan to investigate the gains that knowledge about structure can have for a caching proxy, and shows that structured partial caching of media object segments achieves a higher byte hit ratio.
Abstract: News on demand features user interaction, interdependent media and is used by different client types. These requirements are not yet accommodated by a single solution. We address this issue by utilizing a priori knowledge about news articles’ structure encoded in a presentation plan. Using this, we investigate the gains that knowledge about structure can have for a caching proxy. Our simulations show that structured partial caching of media object segments achieves a higher byte hit ratio compared to a non-structured caching scheme when access patterns follow a Multi-Selection Zipf distribution.