?? h_264視頻編碼傳輸的qos特性分析（二） - it專欄.htm
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align=left>H.264中幀內編碼大體上類似于以往的視頻編碼標準，但也進行了重要的改進，主要體現在：</DIV>
<DIV style="TEXT-INDENT: 21pt"
align=left>（1）H.264中幀內預測宏塊的參考宏塊可以是幀間編碼宏塊，幀內預測宏塊并不像H.263中的幀內編碼一樣，而采用預測的幀內編碼比非預測的幀內編碼有更好的編碼效率，但降低了幀內編碼的重同步性能，可以通過設置限制幀內預測標記來恢復這一性能。</DIV>
<DIV style="TEXT-INDENT: 21pt" align=left>（2）只包含幀內宏塊的片有兩種，一種是幀內片（I
Slice），一種是立即刷新片（IDR Slice）。立即刷新片需存在于立即刷新圖像（IDR
Picture）中。與短期參考圖像相比，立即刷新圖像有更強壯的重同步性能。</DIV>
<DIV style="TEXT-INDENT: 21pt"
align=left>為了更適用無線IP網絡環境中的應用，H.264通過采用率失真優化編碼和設置幀內預測標志，來提高幀內圖像的重同步性能</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>》</SPAN></DIV></DIV>
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