CATV网络MPEG-2系统目标解码器在DirectShow上的设计与实现

提出了一种用Microsoft DirectShow的图形编辑滤波器来实现CATV网络MPEG-2的系统目标解码器模型的设计方法.通过对STD两种结构:程序流STD和传输流STD的具体分析和仿真,基本解决了STD模型具体实现的不同参数的设置问题.最后对原始流缓冲EB的实时仿真结果也基本符合MPEG-2对STD的设计要求.     

基于DirectShow/DES的MPEG-2音视频编辑软件的实现方案

本文介绍基于Direct Show的Direct Show编辑业务（DES，Direct Show Editing Services）的基本原理，并以实例说明了用DES开发MPEG-2音视频编辑软件的实现方案。主要着重于几项关键技术：Timeline的构建，对编辑结果进行预览和保存功能的实现。     

MPEG-2视频编码标准及CLM4400视频编码芯片简介

本文通过MPEG-2和MPEG-1在视频方面的比较，简略地介绍了MPEG-2视频标准，并附带介绍了C-CUBE公司的MPEG-2视频编码芯片CLM4400的功能和应用前景。     

IPTV中的流传输技术研究与分析

IPTV业务是基于互联网流媒体技术发展起来的，目前应用于IPTV业务的国际流传输标准主要有ISMA和MPEG-2 TSover IP两种。本文首先介绍IPTV的技术框架，之后从适配IPTV业务特点的角度，对两种流传输技术进行了综合分析和比较。     

MPEC-2标准与MPEG-2编解码专用芯片简介

本文介绍MPEG-2标准和MPEG-2的关键技术和编解码专用芯片.     

MPEG-2标准与MPEG-2编解码专用芯片简介

本文介绍MPEG-2标准和MPEG-2的关键技术和编解码专用芯片。     

浅议HPEG-7标准及其应用

本文主要从MPEG-7标准与MPEG-1、MPEG-2、MPEG-4标准的关系、MPEG-7标准的目标、MPEG-标准的构成要素等方面，分析与概述了MPEG-7标准的技术内容，并AKMPEG-7标准的Pull类应用和Push类应用两方面介绍了MPEG-7标准的应用情况。     

MPEG-2在卫星数字广播电视的传输系统中的应用

MPEG-2标准作为国内国际领域先进的通用编码目前已经在卫星数字广播电视行业得到广泛的应用,极大地提高了视频传输效率,改善了画面质量,拓宽了广播电视受用范围。本文主要介绍了MPEG-2标准的基本结构,MPEG-2视频编码系统原理及关键技术,分析了MPEG-2在卫星数字广播电视的传输应用中的优点,并提出几点意见建议。     

MPEG-2传输流的复用

MPEG-2是数字电视系统中的关键技术之一,介绍了MPEG-2的概念、系统标准及MPEG-2传输流（TS）的结构,着重介绍了MPEG-2传输流（TS）的复用技术及复用方式。     

H264及相关视频编码标准论述

视频压缩国际标准主要有：由ITU—T制定的H．261、H．262、H．263、H．264和由MPEG制定的MPEG-1、MPEG-2、MPEG-4，其中H．262／MPEG-2和H．264／MPEG-4AVC由ITU—T与MPEG联合制定。     

MPEG-2传输流中I-帧的统计分析

I-帧为MPEG定义的一种图像格式，它的应用场合比较广泛，比如基于视频内容检索的多媒体系统、视频节目的特技播放，给出一种对MPEG-2传输流中I-帧分布的统计方法，对3段数字电视节目进行实验，得到节目流中I-帧的分布情况，包括I-帧的大小、间隔等，并且分析了TS流中I-帧分布的特点。     

An Efficient Transmission Scheme of MPEG2‐TS over RTP for a Hybrid DMB System

Hybrid digital multimedia broadcasting (DMB) is a next‐generation mobile TV system that combines broadcasting and wireless communication networks and can provide various high‐quality multimedia services. However, if a system adheres to the current standard of transmitting the DMB content in the form of MPEG2‐TS through wireless networks, it results in a burden on the network due to low transmission efficiency. The reasons for the low transmission efficiency are as follows. First, due to its constant bitrate characteristic, DMB MPEG2‐TS includes a considerable amount of needless information, such as NULL packets and stuffing bytes. Second, due to the inflexibility of the Real‐time Transport Protocol (RTP) standard, one cannot fully utilize the maximum transmission unit of the network when converting MPEG2‐TS to RTP stream for transmission. This paper proposes a new transmission scheme that resolves these problems. Experiment results show that the proposed scheme improves data bitrate transmission efficiency by 8% to 36%, compared to the standard scheme, in the streaming of various real‐DMB contents.     

一种用于MPEG2解码芯片的高效内存存储结构

为了提高MPEG2解码芯片的内存带宽利用率,根据SDRAM的固有特征和MPEG2解码时对内存读取的特点,提出了一种新的内存存储结构。采用该方法,可以大大减少内存读写的冗余时间,从而满足MPEG2 MP@HL解码器的设计要求。与直接映射相比,文章提出的方法可以使行激活的次数至少减少82.6%,内存读写时间减少59%以上。     

MPEG—4终端的系统组成及特点

从MPEG－4系统的分层结构出发，介绍了场景描述、交互性、基本流和同步机制等关键技术问题。叙述了各层所涉及到的基本功能和一些常用的MPEG－4系统工具。最后展望了MPEG－4系统在IP上的发展。     

无线ATM网络中基于MPEG标准的差错恢复

简单地分析了坎线异步转移模式（ＷＡＴＭ）网络中的信道差错特性,着重介绍了ＭＰＥＧ－２标准的差错恢复原理及其在ＷＡＴＭ中的具体实现方法。     

MPEG—2视频业务的两种自回归模型的对比

为了实现多媒体节目流在IP网上的实时播放,因特网工程任务组（IETF）为MPEG－2码流的分割及实时传输制定了相关的协议。根据此协议对MOPEG VBR码流进行分割后,MPEG的三种类型型帧的自相关结构都表现出短时相关性,因此,采用AR（2）模型对三种类型的帧的大小进行了模拟,并且与AR（1）模型进行了对比。结果表明,AR（2）比AR（1）模型能够更好地反映视频源的统计特性。     

Low‐Complexity MPEG‐4 Shape Encoding towards Realtime Object‐Based Applications

Although frame‐based MPEG‐4 video services have been successfully deployed since 2000, MPEG‐4 video coding is now facing great competition in becoming a dominant player in the market. Object‐based coding is one of the key functionalities of MPEG‐4 video coding. Realtime object‐based video encoding is also important for multimedia broadcasting for the near future. Object‐based video services using MPEG‐4 have not yet made a successful debut due to several reasons. One of the critical problems is the coding complexity of object‐based video coding over frame‐based video coding. Since a video object is described with an arbitrary shape, the bitstream contains not only motion and texture data but also shape data. This has introduced additional complexity to the decoder side as well as to the encoder side. In this paper, we have analyzed the current MPEG‐4 video encoding tools and proposed efficient coding technologies that reduce the complexity of the encoder. Using the proposed coding schemes, we have obtained a 56 percent reduction in shape‐coding complexity over the MPEG‐4 video reference software (Microsoft version, 2000 edition).     

一种新的基于场景的VBR MPEG压缩视频源统计模型

由于VBRMPEG视频流可以获得统计复用增益和恒定的图像质量,它已经成为网络视频业务的主流,但是也给网络服务质量的控制带来了困难。因此,我们很有必要针对这些视频业务流对承载它们的网络带来的影响进行研究和评估。精确的MPEGVBR视频源统计模型不但有助于提高网络仿真的准确度,而且有助于研究网络其它方面的问题,如网络延时、分组丢失、延迟扰动等。本文提出了一种新的基于场景的VBRMPEG压缩视频源统计模型,该模型不仅计算简便,能快速产生符合要求的视频流样本,还能同时拟合原始视频业务数据的概率分布情况、自相关函数和自相似特性。     

Integrating the scene length characteristics of MPEG video bitstreams into a direct broadcast satellite network with return channel system

In order to optimize the network resources, we should incorporate all the available information into the network design. However, incorporating irrelevant information may increase the design complexity and/or decrease the performance of the network. In this paper, we investigate the relevance of integrating the scene length characteristics of moving pictures expert group (MPEG) coded video bitstreams into a direct broadcast satellite (DBS) network with return channel system (DVB‐RCS). Due to the complexity of the studied system, unless disputable simplifications are made, it is hard to achieve a mathematical foundation for this integration. Our analysis relies on extensive set of simulations. Firstly, we achieve the scene length distributions for MPEG bitstreams based on the proposed scene change models and their subjective observations of the actual video. We show that these models may be used to estimate the scene length of MPEG bitstreams. We then integrate this estimation into a DBS network simulator. Finally, we show that the scene length characteristics may be used to improve the DBS network performance under certain conditions. Copyright © 2004 John Wiley & Sons, Ltd.     

抗信元丢失的交织技术

ＡＴＭ网络中传输ＭＰＥＧ－２视频信号存在的信元丢失问题会导致接收图象的大 损伤，交织技术可以使爱损区域分隔较远且面积变小，利于恢复受损区域。