一种用户码率偏好敏感的网络编码视频分发算法

A User Bitrate Preference-Aware Streaming Algorithm Based on Network Coding

无线网络用户拥有差异化的网络与视频接收设备,通过单一优化用户获得的下载速率,无法最终确保用户获得良好的视频质量.多码率视频流编码基于一种多描述编码(MDC),在MDC视频流中,由于各层数据以数据分片的形式传输,网络编码成为一种有效的视频分片传输机制.从网络、用户兴趣、内容属性等角度分析用户对视频流码率的偏好,提出了一种用户码率敏感的流媒体数据传输算法.实验表明该算法在用户偏好满足与降低网络消耗率上,优于已有研究.在用户可以获得偏好码率的同时,保证了流媒体的连续性.

The difference among the heterogeneous user bitrate preference has greatly limited the quality-of-experience （QoE） due to the heterogeneous network environment and devices, and the homogeneous download schedule in wireless video streaming. Multi-resolution code network coding has emerged as a promising approach to delivering videos in multiple description coding （MDC） streaming, where chunks of different layers are delivered to users. In this paper, a bitrate-aware streaming algorithm was proposed based on network coding to satisfy users bitrate preference, considering the network condition, user interests, and content property that together characterize the user preference. Experimental results show that the proposal algorithm outperforms traditional approach in user preference satisfaction and higher network utilization, such that users can enjoy both improved bitrate and streaming continuity.