?? h_264視頻編碼傳輸?shù)膓os特性分析（三） - it專欄.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、參數(shù)集等非常小，將它們合并在一起有利于減少頭標(biāo)開銷。現(xiàn)有的兩種集合分組：①單一時(shí)間集合分組（STAP），按時(shí)間戳進(jìn)行組合，一般用于低時(shí)延環(huán)境；②多時(shí)間集合分組（MTAP），不同時(shí)間戳也可以組合，一般用于高時(shí)延環(huán)境，比如流應(yīng)用。<BR></DIV>
<DIV align=left>五、結(jié)束語</DIV>
<DIV style="TEXT-INDENT: 21pt"
align=left>本文針對(duì)最新推出的視頻編解碼標(biāo)準(zhǔn)H.264的抗誤碼性能進(jìn)行了分析，可以看到H.264/AVC標(biāo)準(zhǔn)除了擁有高效編碼的特性，還引入了一些新工具用于提高錯(cuò)誤恢復(fù)能力。特別是，參數(shù)集、NAL上的NALU的概念、靈活的宏塊排序FMO、數(shù)據(jù)分割以及幀內(nèi)編碼等都極大地提高了復(fù)雜網(wǎng)絡(luò)環(huán)境下的抗誤碼能力。同時(shí)，詳細(xì)介紹了與視頻比特流傳輸密切相關(guān)的RTP封裝規(guī)范，與H.264的NAL緊密結(jié)合，提供了對(duì)數(shù)據(jù)封裝的指導(dǎo)。通過附加了一些傳輸層的低開銷機(jī)制來用于NALU包的高效拆分和聚合。當(dāng)聯(lián)合使用這些工具時(shí)，可以達(dá)到更高的性能，在因特網(wǎng)和惡劣的無線網(wǎng)絡(luò)上進(jìn)行高質(zhì)量的視頻壓縮也將最終成為現(xiàn)實(shí)[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">相關(guān)文檔：《<A
href="http://blog.csdn.net/fengyv/archive/2006/05/08/712985.aspx"><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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">關(guān)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: 宋體">H.264</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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">視頻編碼傳輸?shù)?lt;/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: 宋體">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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: 宋體; 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">關(guān)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: 宋體">H.264</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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">視頻編碼傳輸?shù)?lt;/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: 宋體">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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: 宋體; 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">關(guān)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: 宋體">H.264</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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">視頻編碼傳輸?shù)?lt;/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: 宋體">QoS</SPAN><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋體; 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關(guān)鍵技術(shù)</A>》</SPAN></DIV></DIV>
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