一种嵌入视频流的丢包自测量方法

发布时间：2018-05-09 06:18

本文选题：主动测量 + 视频　；参考：《软件学报》2013年09期

【摘要】：现有的丢包主动测量方法是通过探测流的丢包信息去推测网络的丢包特性,进而推测特定应用流的丢包,测量结果不能准确获知某一给定应用流的丢包情况.由于丢包通常属于短时间、小概率事件,要更加准确地测量丢包就意味着需延长测量时间,或者提高探测流的发送速率以及时发现丢包,这将不可避免地增加网络的额外负载.分析了不同类型帧损伤的影响,并以MPEG-4,H264视频为研究对象,通过对其码流结构特点及RTP封装策略的分析,提出一种将测量信息嵌入到视频用户数据域(User_Data)的丢包测量方法 PLBU(packet loss measurement based on User_Data).该方法利用视频码流信息完成对丢包的探测,不影响视频的正常播放,不需要注入新的探测流,极大地降低了因测量而引入的额外负载.NIST Net及Planetlab等实验结果表明,该算法不仅丢包测量准确性高,且可提供丢包所属视频帧类型等信息,如视频中I,P,B帧的数据包丢失的情况.借助该测量方法,服务提供商可评测网络视频流丢包,并分析视频体验质量(QoE)变化情况,且不受视频流在网络传输中的优先级影响.
[Abstract]:The existing active packet loss measurement method is to infer the packet loss characteristics of the network by detecting the packet loss information of the flow, and then to infer the packet loss of a particular application stream. The measurement results can not accurately determine the packet loss situation of a given application stream. Because packet loss usually belongs to short time and small probability event, to measure the missing packet more accurately means to extend the measurement time or to increase the transmission rate of the probe stream to find the lost packet in time, which will inevitably increase the extra load of the network. This paper analyzes the influence of different types of frame damage, and takes MPEG-4 H264 video as the research object, and analyzes the characteristics of its bitstream structure and RTP encapsulation strategy. This paper presents a method of packet loss measurement, PLBU(packet loss measurement based on user population data, which embeds measurement information into video user data domain. This method uses video stream information to detect packet loss, does not affect the normal playback of video, does not need to inject new detection stream, and greatly reduces the additional load. NIST Net and Planetlab, etc. This algorithm not only has high accuracy in packet loss measurement, but also can provide information such as video frame type of packet loss, such as the packet loss of Impan B frame in video. With the help of this measurement method, the service provider can evaluate the network video stream packet loss, and analyze the video experience quality (QoS) changes, and not be affected by the priority of the video stream in the network transmission.
【作者单位】：同济大学计算机科学与技术系;中国人民解放军65583部队;
【基金】：国家自然科学基金(61073154)
【分类号】：TP393.06

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