Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97)最新文献

Online smoothing of live, variable-bit-rate video 实时、可变比特率视频的在线平滑

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629390

J. Rexford, S. Sen, J. Dey, W. Feng, J. Kurose, J. Stankovic, D. Towsley

{"title":"Online smoothing of live, variable-bit-rate video","authors":"J. Rexford, S. Sen, J. Dey, W. Feng, J. Kurose, J. Stankovic, D. Towsley","doi":"10.1109/NOSDAV.1997.629390","DOIUrl":"https://doi.org/10.1109/NOSDAV.1997.629390","url":null,"abstract":"Bandwidth smoothing techniques are effective at reducing the burstiness of a compressed, pre-recorded video stream by prefetching frames into the client playback buffer in advance of each burst. In contrast to stored video, live applications typically have limited knowledge of frame sizes and often require bounds on the delay between the source and the client(s). This paper addresses bandwidth smoothing for a growing number of live video applications, such as videocasts of courses or television news, where many clients be willing to tolerate a playback delay of several seconds or minutes in exchange for a smaller throughput requirement. Extending techniques for smoothing pre-recorded video, we develop online, window-based smoothing algorithms for these delay-tolerant applications. Experiments with MPEG traces demonstrate that the new algorithms significantly reduce the peak rate, coefficient of variation, and effective bandwidth of variable-bit-rate video streams using fairly small window sizes (1-10 seconds), closely approximating the performance of the optimal offline algorithm.","PeriodicalId":401407,"journal":{"name":"Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126613141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 90

System support for mobile multimedia applications 系统支持移动多媒体应用程序

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629374

Jon Inouye, Shanwei Cen, C. Pu, J. Walpole

引用次数: 55

Layered video multicast with retransmission (LVMR): evaluation of error recovery schemes 带重传的分层视频组播:错误恢复方案的评估

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629383

Xue Li, S. Paul, P. Pancha, M. Ammar

引用次数: 104

Evaluation of data passing and scheduling avoidance 数据传递的评估与调度回避

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629370

J. Brustoloni, P. Steenkiste

{"title":"Evaluation of data passing and scheduling avoidance","authors":"J. Brustoloni, P. Steenkiste","doi":"10.1109/NOSDAV.1997.629370","DOIUrl":"https://doi.org/10.1109/NOSDAV.1997.629370","url":null,"abstract":"Multimedia applications often transfer data between devices or output the same data to multiple devices at very high rates, and therefore require an efficient I/O subsystem. Data copying and context switching have long been identified as sources of I/O inefficiency, and consequently there have been many proposals of: (1) copy avoidance techniques, which pass data between application and system buffers without copying; (2) data passing avoidance techniques, which allow applications to perform multiple I/O operations on system buffers, without passing data to or from application buffers; and (3) scheduling avoidance techniques, which allow multiple I/O operations on system buffers to proceed at interrupt level, without scheduling. Adoption of such optimizations remains limited because most require major changes in the API or structure of existing operating systems. The authors recently proposed, however, new copy avoidance techniques, emulated copy and emulated share, which, unlike previous work, require no such changes. In their experiments, copy avoidance optimizations gave performance improvements almost as good as or better than those of data passing avoidance, and scheduling avoidance provided only modest performance improvements over priority scheduling. Their results suggest that the I/O performance of conventional operating systems can be greatly improved without the major changes in API or organization commonly advocated.","PeriodicalId":401407,"journal":{"name":"Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132911327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Random RAIDs with selective exploitation of redundancy for high performance video servers 随机raid与选择性利用冗余的高性能视频服务器

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629305

Y. Birk

{"title":"Random RAIDs with selective exploitation of redundancy for high performance video servers","authors":"Y. Birk","doi":"10.1109/NOSDAV.1997.629305","DOIUrl":"https://doi.org/10.1109/NOSDAV.1997.629305","url":null,"abstract":"The paper jointly addresses the issues of load balancing, fault tolerance, responsiveness, agility, streaming capacity and cost effectiveness of high performance storage servers for data streaming applications such as video on demand. Striping the data of each movie across disks in a \"random\" order balances the load while breaking any correlation between user requests and the access pattern to disks. Parity groups are fixed site, comprising consecutive blocks of a movie and a derived parity block and resulting in \"random\" disk members of any given group. Consequently, the load of masking a faulty disk is shared by all disk drives, minimizing the degradation in streaming capacity. By using the redundant information to avoid accessing an overloaded disk drive, the occasional transient imbalance in disk load due to the randomization is partly prevented and, when occurring, can be circumvented. Finally and most important, making a distinction between data blocks and redundant blocks and using redundant blocks only when necessary is shown to substantially reduce required buffer sizes without giving up the benefits. The result is a simple, flexible and robust video server architecture.","PeriodicalId":401407,"journal":{"name":"Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124131378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 31

Design and implementation of video server for mixed-rate streams 混合速率流视频服务器的设计与实现

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629304

J. Nishikawa, I. Okabayashi, Y. Mori, S. Sasaki, M. Migita, Y. Obayashi, S. Furuya, K. Kaneko

{"title":"Design and implementation of video server for mixed-rate streams","authors":"J. Nishikawa, I. Okabayashi, Y. Mori, S. Sasaki, M. Migita, Y. Obayashi, S. Furuya, K. Kaneko","doi":"10.1109/NOSDAV.1997.629304","DOIUrl":"https://doi.org/10.1109/NOSDAV.1997.629304","url":null,"abstract":"We have developed a video server system for continuous media (cm) data, consisting of a low-priced personal computer (PC) and disk array. The bit rate of the data stream varies depending on which applications are being used, which include video on demand (VOD) and digital video editing systems. Moreover, due to large data volumes, arranging and controlling data with different bit rates on the disk array presents a number of problems. We propose a new file system which utilizes two-layer hierarchical media management: the concept of packages based on the management of contents and disk space, and cm-records based on the management of bit-rate and disk access rate. The size of the packages and the sizes of cm-records are flexible so that a range of bit-rate streams are supported. The site of disk access is decided by taking into account access efficiency, which in turn depends on the continuous media data bit rate. Using these methods it is possible to reduce dramatically the memory space for administration, even for large volumes of data. The file system and the experimental video server have been implemented on a standard PC platform. This prototype system achieved 230.8 Mbps of I/O capability for continuous media.","PeriodicalId":401407,"journal":{"name":"Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127030116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

An extensible framework for RTP-based multimedia applications 基于rtp的多媒体应用程序的可扩展框架

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629358

J. Du, D. Putzolu, L. Cline, D. Newell, M. Clark, D. Ryan

引用次数: 8

Adaptive middleware for mobile multimedia applications 移动多媒体应用的自适应中间件

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629391

G. Blair, G. Coulson, N. Davies, P. Robin, T. Fitzpatrick

引用次数: 75

A virtual network service for integrated-services internetworks 用于综合业务互联网络的虚拟网络业务

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629396

L. Delgrossi, D. Ferrari

引用次数: 28

A comprehensive multimedia control architecture for the Internet 一个全面的因特网多媒体控制体系结构

Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97) Pub Date : 1997-05-19 DOI: 10.1109/NOSDAV.1997.629366

H. Schulzrinne

引用次数: 51