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arXiv 1406.3161cs.MM
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基于系统动力学的优化自适应流媒体表示

Optimized Adaptive Streaming Representations based on System Dynamics

Laura Toni, Ramon Aparicio-Pardo, Karine Pires, Gwendal Simon, Alberto Blanc, Pascal Frossard

摘要:

自适应流媒体通过为每个视频序列提供多个编码版本来解决互联网上日益增长的多媒体内容的异构需求。每个版本(或表示)都有不同的分辨率和比特率,针对特定的用户集,如电视或手机客户端。虽然大多数现有的自适应流处理有效的播放控制策略在客户端,我们在本文中提供商的角度来看,并提出解决方案,以提高用户满意度,通过优化的视频序列的编码速率。我们制定了一个整数线性规划,最大限度地提高用户的平均满意度,考虑到网络动态,视频内容的信息,和用户群体的特点。优化的解决方案是一组编码参数,允许创建不同的流,以鲁棒地满足用户的请求随着时间的推移。我们模拟多个自适应流会话的特点是现实的网络连接模型,其中所提出的解决方案优于常用的供应商的建议,在用户满意度方面,但也在公平性和中断概率。仿真结果进一步表明,视频内容信息以及网络约束和用户的统计数据在选择合适的编码参数以提供公平性和减少网络资源使用方面起着至关重要的作用。最后,我们提出了一些实用的指导方针,可用于选择基于用户群的特性,网络容量和视频内容的类型的编码参数。

英文摘要:

Adaptive streaming addresses the increasing and heterogenous demand of multimedia content over the Internet by offering several encoded versions for each video sequence. Each version (or representation) has a different resolution and bit rate, aimed at a specific set of users, like TV or mobile phone clients. While most existing works on adaptive streaming deal with effective playout-control strategies at the client side, we take in this paper a providers' perspective and propose solutions to improve user satisfaction by optimizing the encoding rates of the video sequences. We formulate an integer linear program that maximizes users' average satisfaction, taking into account the network dynamics, the video content information, and the user population characteristics. The solution of the optimization is a set of encoding parameters that permit to create different streams to robustly satisfy users' requests over time. We simulate multiple adaptive streaming sessions characterized by realistic network connections models, where the proposed solution outperforms commonly used vendor recommendations, in terms of user satisfaction but also in terms of fairness and outage probability. The simulation results further show that video content information as well as network constraints and users' statistics play a crucial role in selecting proper encoding parameters to provide fairness a mong users and to reduce network resource usage. We finally propose a few practical guidelines that can be used to choose the encoding parameters based on the user base characteristics, the network capacity and the type of video content.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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