📄 h_264视频编码传输的qos特性分析（三） - it专栏.htm
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align=left><SPAN>（2）<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN>NALU的合并</DIV>
<DIV style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: 21pt"
align=left>一些NALU如SEI、参数集等非常小，将它们合并在一起有利于减少头标开销。现有的两种集合分组：①单一时间集合分组（STAP），按时间戳进行组合，一般用于低时延环境；②多时间集合分组（MTAP），不同时间戳也可以组合，一般用于高时延环境，比如流应用。<BR></DIV>
<DIV align=left>五、结束语</DIV>
<DIV style="TEXT-INDENT: 21pt"
align=left>本文针对最新推出的视频编解码标准H.264的抗误码性能进行了分析，可以看到H.264/AVC标准除了拥有高效编码的特性，还引入了一些新工具用于提高错误恢复能力。特别是，参数集、NAL上的NALU的概念、灵活的宏块排序FMO、数据分割以及帧内编码等都极大地提高了复杂网络环境下的抗误码能力。同时，详细介绍了与视频比特流传输密切相关的RTP封装规范，与H.264的NAL紧密结合，提供了对数据封装的指导。通过附加了一些传输层的低开销机制来用于NALU包的高效拆分和聚合。当联合使用这些工具时，可以达到更高的性能，在因特网和恶劣的无线网络上进行高质量的视频压缩也将最终成为现实[5]。</DIV>
<DIV style="TEXT-INDENT: 21pt" align=left>
<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>下一篇：《<A
href="http://blog.csdn.net/fengyv/archive/2006/05/09/714972.aspx">基于IP的H.264关键技术</A>》</SPAN></DIV></DIV>
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