📄 h_264视频编码传输的qos特性分析（一） - it专栏.htm
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style="LINE-HEIGHT: 150%">，</SPAN><SPAN style="LINE-HEIGHT: 150%">Video Coding
Layer</SPAN><SPAN style="LINE-HEIGHT: 150%">）和网络提取层（</SPAN><SPAN
style="LINE-HEIGHT: 150%">NAL</SPAN><SPAN
style="LINE-HEIGHT: 150%">，</SPAN><SPAN style="LINE-HEIGHT: 150%">Network
Abstraction Layer</SPAN><SPAN
style="LINE-HEIGHT: 150%">）。其中，视频编码层独立于网络，主要包括核心压缩引擎和块、宏块和片的语法句法定义。通过引入一系列新特性，不但使</SPAN><SPAN
style="LINE-HEIGHT: 150%">H.264</SPAN><SPAN
style="LINE-HEIGHT: 150%">的编码压缩效率提升了近</SPAN><SPAN
style="LINE-HEIGHT: 150%">1</SPAN><SPAN
style="LINE-HEIGHT: 150%">倍，而且多种错误恢复工具又增强了视频流的顽健性。网络提取层的主要功能是定义数据的封装格式，把</SPAN><SPAN
style="LINE-HEIGHT: 150%">VCL</SPAN><SPAN
style="LINE-HEIGHT: 150%">产生的比特字符串适配到各种各样的网络和多元环境中。涉及片级别以上的语法定义，包括独立片解码所要求的数据表示，类似以往视频压缩标准中的图像和头部顺序数据；防止竞争的编码；附加的增强信息以及编码片的比特字符串。</SPAN></DIV>
<DIV style="TEXT-INDENT: 21pt; LINE-HEIGHT: 150%" align=left><SPAN
style="LINE-HEIGHT: 150%">H.264</SPAN><SPAN
style="LINE-HEIGHT: 150%">从框架结构上将</SPAN><SPAN
style="LINE-HEIGHT: 150%">NAL</SPAN><SPAN
style="LINE-HEIGHT: 150%">与</SPAN><SPAN
style="LINE-HEIGHT: 150%">VCL</SPAN><SPAN
style="LINE-HEIGHT: 150%">分离，主要有两个目的：</SPAN></DIV>
<DIV style="TEXT-INDENT: 21pt; LINE-HEIGHT: 150%" align=left><SPAN
style="LINE-HEIGHT: 150%">其一，可以定义</SPAN><SPAN
style="LINE-HEIGHT: 150%">VCL</SPAN><SPAN
style="LINE-HEIGHT: 150%">视频压缩处理与</SPAN><SPAN
style="LINE-HEIGHT: 150%">NAL</SPAN><SPAN
style="LINE-HEIGHT: 150%">网络传输机制的接口，这样允许视频编码层</SPAN><SPAN
style="LINE-HEIGHT: 150%">VCL</SPAN><SPAN
style="LINE-HEIGHT: 150%">的设计可以在不同的处理器平台进行移植，而与</SPAN><SPAN
style="LINE-HEIGHT: 150%">NAL</SPAN><SPAN
style="LINE-HEIGHT: 150%">层的数据封装格式无关；<BR></SPAN><SPAN
style="FONT-SIZE: 10.5pt"> 其二，</SPAN><SPAN
style="FONT-SIZE: 10.5pt">VCL</SPAN><SPAN
style="FONT-SIZE: 10.5pt">和</SPAN><SPAN
style="FONT-SIZE: 10.5pt">NAL</SPAN><SPAN
style="FONT-SIZE: 10.5pt">都被设计成工作于不同的传输环境，异构的网络环境并不需要对</SPAN><SPAN
style="FONT-SIZE: 10.5pt">VCL</SPAN><SPAN
style="FONT-SIZE: 10.5pt">比特流进行重构和重编码。下面分别就</SPAN><SPAN
style="FONT-SIZE: 10.5pt">VCL</SPAN><SPAN
style="FONT-SIZE: 10.5pt">和</SPAN><SPAN
style="FONT-SIZE: 10.5pt">NAL</SPAN><SPAN
style="FONT-SIZE: 10.5pt">对于视频传输的</SPAN><SPAN
style="FONT-SIZE: 10.5pt">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt">进行分析。</SPAN></DIV>
<DIV style="TEXT-INDENT: 21pt; LINE-HEIGHT: 150%" align=left><SPAN
style="FONT-SIZE: 10.5pt"> </SPAN><SPAN
style="FONT-SIZE: 10.5pt">相关文档：《<A
href="http://blog.csdn.net/fengyv/archive/2006/05/08/712985.aspx"><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">关于</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">H.264</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">视频编码传输的</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">特性分析（一）</SPAN></A>》</SPAN></DIV>
<DIV style="TEXT-INDENT: 21pt; LINE-HEIGHT: 150%" align=left><SPAN
style="FONT-SIZE: 10.5pt">
《<A href="http://blog.csdn.net/fengyv/archive/2006/05/08/713008.aspx"><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">关于</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">H.264</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">视频编码传输的</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">特性分析（二）</SPAN></A>》</SPAN></DIV>
<DIV style="TEXT-INDENT: 21pt; LINE-HEIGHT: 150%" align=left><SPAN
style="FONT-SIZE: 10.5pt">
《<A href="http://blog.csdn.net/fengyv/archive/2006/05/08/713025.aspx"><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">关于</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">H.264</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">视频编码传输的</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">特性分析（三）</SPAN></A>》<BR></SPAN>上一篇：《<A
href="http://blog.csdn.net/fengyv/archive/2006/05/08/712631.aspx">H.264/AVC技术进展及其务实发展策略思考</A>》</DIV>
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