IPTV视频质量故障定位及处理方法

随着国内IPTV业务的快速发展,多媒体研究集团（MRG）完成的一项研究评结果证实视频质量对IPTV的发展和成功具有关键的作用,IPTV视频质量是导致客户投诉和客户流失的重要因素。目前对全国IPTV运营商而言,由于IPTV是承载在IP网上的视频业务,不管是的网络结构还是IPTV平台技术都相对复杂,所以导致IPTV视频质量故障难以定位和处理。本文就是针对IPTV视频质量故障定位及处理提出了一套比较完整的解决方案,以供全国IPTV技术人员参考,由于作者水平有限,文中不足之处敬请指正。     

SZC-8202视频综合测试仪

电视系统质量好坏与否是与其视频通道技术指标密切相关的。如何精确、快捷地测量视频指标是电视行业技术工作们多年来研究的课题。随着数字技术的迅速发展，新一代的智能型视频测试仪器应运而生，它的出现将对视频测量技术乃至广播电视技术产生重大影响。     

泰克推出IPTV视频质量测量(VQM)套件

2006年2月10日,泰克公司宣布为诊断和分析通过IP协议传送的流式视频推出Spectra21VQM（视频质量测量）监测解决方案。Spectra21VQM可以帮助用户识别数字影像质量差的原因,如IP传输网络中发生丢包、延迟或数据损毁。Spectra21VQM是第一个支持多种服务质量（Qos）分数和视频行业标准,并采用非专有前向纠错（FEC）分析技术的便携式监测解决方案,运营商和有线网络可以在新兴的IP视频传送机会中使用这一方案。     

视频监控领域标准化工作动态概述

视频监控系统以其直观、方便、信息内容丰富而被广泛应用于金融系统、交通系统、公安系统、教育系统和医疗系统等众多领域.从视频监控领域近年来的标准制定工作出发,对于行业标准化工作发展现状进行梳理,并得出:视频监控标准化工作将在视频监控分布式存储、视频大数据处理等重点方向有所突破,该方向也将指导各标准化组织以及设备厂商、运营商积极开展标准研究及制定工作继续完善.     

UT斯达康首推mVision电信级IP TV解决方案

近日，UT斯达康针对电信运营商开展IPTV业务的需要，推出了端到端的电信级视频服务和互动娱乐服务解决方案——mVision。它是一套完整的为电信运营商和宽带服务提供商设计的端到端数据、语音和多媒体(Triple Play)业务解决方案，通过IP网络传送广播级视频质量的视频和互动娱乐服务。该系统充分考虑了运营商在平滑扩容、     

QoE领域新进展及其在最小化路测（MDT）方面的新应用

用户体验质量（QoE）是重要的网络评价指标。文章首先讨论面向用户感受的网络质量评价的一些技术挑战：其次介绍QoE领域的数项最新进展,包括3G网络典型业务视频及多媒体QoE技术的科研进展及标准化进展,QoE指标体系研究的进展等;最后提出一种创新的面向QoE的MDT模式,以期推动QoE及网络建设,优化技术的发展。     

国际电工委员会TC100年会将于11月在京召开

国际电工委员会TC100技术委员会（TC10000）“音频、视频及多媒体系统与设备标准化技术委员会”1999年会将于11月10日至16日在北京国际会议中心召开，从目前报名的情况看，届时将有来自国外40个国家，近百名国外专家来京参加会议。目前本次国际会议的准备工作正在紧锣密鼓地进行，这是一次音频、视频及多媒体领域标准化工作最高层次的国际会议，会议将着重讨论音频、视频及多媒体领域的标准化工作的发展对策，重点关注多媒体设备、数字电视、多媒体信息的存储技术、多媒体分系统设备的性能测量方法以及电缆分配系统的技术规范等。国际电工…     

UT斯达康端到端视频流媒体解决方案

UT斯达康mVsion系统是一套完整的为电信运营商和宽带服务提供商设计的端到端数据，语音、多媒体(Triple Play)业务解决方案，通过IP网络传送广播级视频质量的视频和互动娱乐服务。该系统充分考虑运营商在平滑扩容、高可靠性以及低带宽的要求，使运营商在现有网络上可以开展直播电视、时移电视、视频点播，网络游戏以及视频电话等新业务，系统结构如图1所示．     

基于智能手机的客观QoE测量技术

用户体验质量(QoE)是用户对运营商网络质量的最直观评估,但其取得途径往往存在"测量点离用户端较远、包括太多主观因素"等问题.如何客观准确地搜集OoE数据并顺利上传到管理系统,最终提高网络运营质量,是运营商及用户都很关心的技术问题.基于QOE测量领域的一些技术以及手机终端能力的提升,结合运营商对未来移动网络质量评估的需...     

IPTV视频质量评价技术综述

IPTV作为数字视频的一个重要业务,其提供的视频质量对于用户来说非常重要。如何对IPTV系统提供的数字视频质量进行评价是近年来研究的热点和难点。本文介绍了视频质量主观评价方法和客观评价方法的研究进展,分析了无参考度量技术,对比各种算法、视频质量评价的标准化状况,总结了IPTV视频质量评价的难点和研究方向。     

QoE in video streaming over wireless networks: perspectives and research challenges

The deployment of 3G/LTE networks and advancements in smart mobile devices had led to high demand for multimedia streaming over wireless network. The rapid increasing demand for multimedia content poses challenges for all parties in a multimedia streaming system, namely, content providers, wireless network service providers, and smart device makers. Content providers and mobile network service providers are both striving to improve their streaming services while utilizing advancing technologies. Smart device makers endeavor to improve processing power and displays for better viewing experience. Ultimately, the common goal shared by content providers, network service providers, and smart device manufactures is to improve the QoE for users. QoE is both an objective and a subjective metric measuring the streaming quality experience by end users. It may be measured by streaming bitrate, playback smoothness, video quality metrics like Peak to Signal Noise Ratio, and other user satisfaction factors. There have been efforts made to improve the streaming experiences in all these aspects. In this paper, we conducted a survey on existing literatures on QoE of video streaming to gain a deeper and more complete understanding of QoE quality metrics. The goal is to inspire new research directions in defining better QoE and improving QoE in existing and new streaming services such as adaptive streaming and 3D video streaming.     

交互式视频质量评价方法研究进展

在交互式视频应用快速发展的同时,如何评价视频质量成为当前亟待解决的挑战性难题,其成果对整个多媒体通信系统的各环节技术发展具有关键作用。从主观质量评价、客观质量评价两个角度综述了当前交互式视频质量评价的研究与应用现状,其中主观质量评价方法包括主观视频质量评价数据库、主观视频质量评价打分与计算机制,客观质量评价方法则包括视觉信号处理与分析、深度学习机制下的评价与建模方法等。在总结上述研究方法与成果的基础上,展望了本领域的研究与发展。     

A new perceptual quality metric for compressed video based on mean squared error

A full reference objective quality metric that predicts perceived quality of compressed video is proposed. The metric estimates the mean opinion score (MOS) based on spatio-temporal activity and the mean squared error (MSE) between original and compressed video sequences. The proposed metric has been tested on multimedia sequences of common intermediate format (CIF) resolution compressed at a wide range of bit rates using the H264/AVC coding standard. This metric shows a higher correlation with subjective quality ratings (MOS) than popular metrics such as peak signal to noise ratio (PSNR), video structural similarity metric (VSSIM), national telecommunication and information administration’s video quality metric (NTIA/ITS VQM) and PSNRplus. This algorithm is particularly useful for real-time quality estimation of multimedia sequences compressed using block-based video coding schemes and all the parameters of the metric can be calculated automatically with a modest amount of processing overhead.     

VIRAL: coupling congestion control with fair video quality metric

Video streaming is often carried out by congestion controlled transport protocols to preserve network sustainability. However, the success of the growth of such non-live video flows is linked to the user quality of experience. Thus, one possible solution is to deploy complex quality of service systems inside the core network. Another possibility would be to keep the end-to-end principle while making aware transport protocols of video quality rather than throughput. The objective of this article is to investigate the latter by proposing a novel transport mechanism which targets video quality fairness among video flows. Our proposal, called VIRAL for virtual rate-quality curve, allows congestion controlled transport protocols to provide fairness in terms of both throughput and video quality. VIRAL is compliant with any rate-based congestion control mechanisms that enable a smooth sending rate for multimedia applications. Implemented inside TFRC a TCP-friendly protocol, we show that VIRAL enables both intra-fairness between video flows in terms of video quality and inter-fairness in terms of throughput between TCP and video flows.     

A QoE handover architecture for converged heterogeneous wireless networks

The convergence of real-time multimedia applications, the increasing coverage of heterogeneous wireless networks and the ever-growing popularity of mobile devices are leading to an era of mobile human-centric multimedia services. In this scenario, heterogeneous communications will co-exist and ensure that the end-user is always best connected. The rigorous networking demands of wireless multimedia systems, beyond quality-oriented control strategies, are necessary to guarantee the best user experience over time. Therefore, the Quality of Experience (QoE) support, especially for 2D or 3D videos in multi-operator environments, remains a significant challenge and is crucial for the success of multimedia systems. This paper proposes a QoE Handover Architecture for Converged Heterogeneous Wireless Networks, called QoEHand. QoEHand extends the Media Independent Handover (MIH)/IEEE 802.21 with QoE-awareness, seamless mobility and video adaptation by integrating a set of QoE-based decision-making modules into MIH, namely a video quality estimator, a dynamic class of service mapping and content adaptation schemes. The QoEHand video estimator, mapping and adaptation components operate by coordinating information about video characteristics, available wireless resources in IEEE 802.11e and IEEE 802.16e service classes, and QoE-aware human experience. The video quality estimator works without the need for any decoding, which saves time and minimises processing overheads. Simulations were carried out to show the benefits of QoEHand and its impact on user perception by using objective and subjective QoE metrics.     

几种主流视频编码方式的性能比较和分析

随着多媒体通信技术的不断发展,不同的组织提出了许多不同特点的编码方法。文中回顾并分析了当前一些主流的编码机制,通过峰值信噪比(PSNR)和最小察觉差(JND)对主流视频编码技术的质量性能进行了比较。通过比较发现,使用客观的PSNR标准时,H．264/AVC的各方面性能要好于现在使用的视频压缩标准,但选择主观的JND标准可能会略微影响不同编码的性能。     

VQeg validation and ITU standardization of objective perceptual video quality metrics

For industry, the need to access accurate and reliable objective video metrics has become more pressing with the advent of new video applications and services such as mobile broadcasting, Internet video, and Internet Protocol television (IPTV). Industry-class objective quality- measurement models have a wide range of uses, including equipment testing (e.g., codec evaluation), transmission- planning and network-dimensioning tasks, head-end quality assurance, in- service network monitoring, and client-based quality measurement. The Video Quality Experts Group (VQEG) is the primary forum for validation testing of objective perceptual quality models. The work of VQEG has resulted in International Telecommunication Union (ITU) standardization of objective quality models designed for standard- definition television and for multimedia applications. This article reviews VQEG's work, paying particular attention to the group's approach to validation testing.     

面向智能物联网的多媒体通信关键技术研究与应用

随着5G大规模商用和人工智能技术的日趋成熟,基础通信服务开启新一轮革新.以固话和手机为代表的传统通信正逐步向场景化智能通信演进,基础通信连接也正在从70亿人和人的连接,向200亿人与人/物的实时音视频连接迈进,呈现超清体验、交互智能、终端多态、服务泛在的发展趋势.本文提出面向智能物联网的多媒体通信系统架构以及关键技术研...     

Perceived Quality Measurement Model Supporting Full Session Mobility in Multimedia Service Delivery

Context-awareness is associated with the concept of machines being able to both recognize and react to the surrounding environment, which has accelerated multimedia computing technology to provide user-oriented intelligent services. The goal of this research focuses on the modeling of video quality measurement in seamless video service delivery process considering the mobility patterns of users. Mobility supporting schemes providing seamless multimedia services are classified into host mobility and user mobility. The former refers to a host-level handoff while the latter indicates a user-level handoff. In host-level handoff, the decisive factors affecting the quality of video contents consumption are the total distance between hosts, the distance to resume streaming while the user is in mobility mode as well as the screen size of the end host. The influential parameters affecting the degree of video quality and seamlessness are evaluated by a subjective quality assessment and then a perceived video quality model was developed, accordingly. In addition, the optimal video delivery switching point to enable user mobility based video service is studied through the quality analysis of host mobility services at varying distances among the hosts. Experimental results show that the proposed quality model has high correlation with assessed quality and is useful to enable an adequate seamless mobility for multimedia service delivery.