NYI: Designing Multimedia Services in Future Integrated Networking

9357685兰根硬件技术的进步正在使计算机和网络发生革命性的变化，从而支持数字多媒体。通过有效地将计算机的可编程性与大众市场信息网络的普及相结合，这些进步预示着媒体传播的新时代。在本研究中，我们重点关注计算与媒体传播之间协同作用所产生的以下领域：(1)多媒体点播信息服务器，可以支持各种服务，从家庭娱乐的视频点播到远程学习和教育的数字图书馆；(2)在未来集成网络中高效支持高性能多媒体应用的媒体同步技术、通信架构和准入控制策略；(3)结构化多媒体远程协作的新兴范例和软件架构。为了设计交互式多媒体点播信息服务，我们开发了一种保证连续媒体检索的约束块分配模型，以及在不影响任何用户实时检索率的情况下同时服务最优用户数量的算法。多媒体服务通常涉及通过高速网络在用户显示站点（如高清电视）上播放多种媒体链（音频样本的连续录制视频帧）。我们建议开发自适应的、基于速率的技术，用于在网络上的显示站点同步播放多媒体链。在高性能多媒体应用（例如，远程管弦乐队）中，来自所有用户的媒体数据必须连续地混合在一起并同步显示。我们提出了最优的分层混合架构，以支持可扩展的远程协作和实时端到端延迟最小的会议，并正在开发一种分组列车协议，其中网络的路由节点本身可以用作混合器，从而将混合与网络中的路由集成在一起，如互联网。我们希望在加州大学圣地亚哥分校的多媒体实验室通过实验证明这些想法。在这个迅速到来的远程-个人交互时代，我们的经验将证明为未来综合网络设计多媒体服务是有价值的。

9357685 Rangan Technological advances in hardware are revolutionizing computers and networks so as to support digital multimedia. By effectively combining the programmability of computers with the pervasiveness of mass-market information networks, these advances promise to herald a new epoch in media communication. In this research, we focus on the following areas arising out of the synergies between computing and media communication: (1) Multimedia on-demand information servers that can support a wide variety of services, ranging from video on-demand for home entertainment to distance learning and digital libraries for education; (2) Media synchronization techniques, communication architectures and admission control strategies for supporting high-performance multimedia applications efficiently over future integrated networks; and (3) Emerging paradigms and software architectures for structured multimedia tele-collaborations. For designing interactive multimedia on-demand information services, we are developing a constrained block allocation model that guarantees continuous media retrieval, and algorithms to service an optimal number of user simultaneously without violating the real-time retrieval, rates of any of the users. Multimedia services generally involve playback of multiple media strands (continuously recorded video frames of audio samples) over high- speed networks onto user display sites (e.g., HDTVs). We propose to develop adaptive, rate-based techniques for synchronous playback of multimedia strands at display sites over networks. In high-performance multimedia applications (e.g., Tele- orchestra), media data form all the user must be continuously mixed together and displayed synchronously. We are proposing optimal hierarchical mixing architectures for supporting scalable tele-collaborations and conferences with minimum real time end- to-end delays and are developing a Packet train protocol in which routing nodes themselves of a network can b e used as mixers, thereby integrating mixing with routing in networks such as the Internet. We expect to experimentally demonstrate these ideas at the Multimedia Laboratory at UCSD. Our experience will prove valuable in designing multimedia services for future integrated networks in this rapidly approaching age of tele-personal interaction.