The characteristic of h . 264 standard can be concluded mainly into three aspects . it is more practicable , more adaptive to ip net and mobile system and it improves the key components of coding structure based on hybrid video coding framework . for example , it adds coding mode decision , multi frame prediction , context - based adaptive variable length coding ( cavlc ) , 4x4 integer transform , loopfilter , etc . the improvement in performance leads to higher computational complexity in the new standard H . 264的技术特点可以归纳为三个方面,一是注重实用;二是注重对移动和ip网络的适应;三是在混合编码器的基本框架下,对其主要关键部件都做了重大改进,如多模式运动估计、帧内预测、多帧预测、基于内容的变长编码、 4 4二维整数变换等。
The discussion is mainly focused on how to getting high compression of mpeg - 4 and the motion estimation algorithms are also discussed especially . this paper discusses the necessary of video encoding , reviews the mpeg - 4 series and some basic points such as the data structrues of video coding as a whole . then the use of traditional compression methods into the mpeg - 4 standard in detail , for example dct transform , motion estimation and compensation , and variable length coding , etc are discussed and a new motion estiomation algorithm is proposed 本论文研究了mpeg - 4视频编码标准中可以提高压缩比的各种特性,详细分析了mpeg - 4中的运动估计算法,做出了详细的试验对比,改进了一种易于实现的新三步搜索运动估计算法,用标准c语言实现了一个符合mpeg4asp语法标准的编码器和解码器,并利用microsoftdirectshow工具将其集成到一个实时视频流传输系统中,该系统具有扩展性和易移植性,为以后的基于网络的多媒体应用奠定了基础。