一种基于NS的网络视频QoS分析方法

为了建立网络中视频传输的QoS分析平台,在分析EvalVid工具集的基础上,选取NS-2作为仿真环境,提出一种网络视频的QoS分析方法。该方法首先从视频流中提取仿真用的trace文件,注入模拟的网络中传输,然后利用结果trace文件将原压缩视频文件中由于传输丢失和延时超过限制的分组丢弃,产生新的视频文件,解码后可进行质量的评价。通过实例证实提出的方案完全可行,并可以作为设计与研究视频传输问题的试验平台。

QoS Analysis Method of Network Video Based on NS

In order to establish investigation platform to analyse the QoS of video transmission over network,this paper first analyses the EvalVid tool-set,then selects NS-2 as the simulation environment,proposes an analysis method of network video QoS.This method uses real video stream to generate trace file,which is then injected into virtual network for transportation.According to result trace file,a new video file is obtained by discarding the packet which is lost or transmission delay over limited time from the original video file,and the new file can be decoded for quality evaluation.It is confirmed by the practice that the proposed method is completely feasible,which can be used as a experimental platform for designing and researching video transportation protocol.