In this research, we use the FFmpeg which is a commonly used media player to parse the structure of H.264 Video Streaming. Because of the Network camera manufactured by different chipsets, the structures of video streaming encoded by the chipsets are different. The execution flow of the FFmpeg decoding process is analyzed, and the corresponding information of detection is recorded. We examine the complete content of video streaming, and measure the decoding time for each function module. Two different network cameras are prepared and tested by the proposed method, and the results are tabulated for the convenience of comparison. The performance of various functional models of H.264 are also analyzed, and the results are represented by charts.
摘要................................................................................................................................i
ABSTRACT...................................................................................................................ii
目錄..............................................................................................................................iii
圖目錄............................................................................................................................v
表目錄...........................................................................................................................vi
第一章前言..................................................................................................................1
1.1 研究背景與動機........................................................................................1
1.2 相關文獻探討............................................................................................3
1.3 論文目標....................................................................................................3
1.4 論文架構....................................................................................................4
第二章 H.264基本概念...............................................................................................5
2.1 H.264簡介.................................................................................................5
2.2 基準配置文件............................................................................................6
2.3 高級配置文件..........................................................................................10
2.4 串流傳輸結構..........................................................................................13
2.4.1 網路提取層概述................................................................................13
2.4.2 序列參數集與圖像參數集................................................................14
2.4.3 條帶資訊............................................................................................16
第三章研究方法........................................................................................................18
3.1 FFmpeg結構分析....................................................................................18
3.2 FFmpeg之H.264功能模組.....................................................................21
3.2.1 熵解碼................................................................................................21
3.2.2 DCT反轉換.........................................................................................24
3.2.3 畫面內預測與畫面間預測................................................................26
3.2.4 去區塊效應濾波器............................................................................28
3.3 檢測項目..................................................................................................29
第四章實驗結果........................................................................................................31
4.1 實驗環境..................................................................................................31
4.2 實驗結果與討論......................................................................................31
第五章結論與未來研究............................................................................................38
5.1 結論..........................................................................................................38
5.2 未來研究方向..........................................................................................39
參考文獻......................................................................................................................40
附件A H.264解碼語法...............................................................................................42
A.1 NAL-unit解碼語法..................................................................................42
A.2 序列參數集解碼語法..............................................................................42
A.3 圖像參數及解碼語法..............................................................................43
A.4 條帶標頭解碼語法..................................................................................44
A.5 條帶資料解碼語法..................................................................................46
A.6 巨宏塊層解碼語法..................................................................................47
A.7 巨宏塊預測解碼語法..............................................................................48
A.8 冗餘區塊解碼語法..................................................................................49
A.9 CAVLC冗餘區塊解碼語法....................................................................50
A.10 CABAC冗餘區塊解碼語法....................................................................51
附件B H.264巨宏塊類型表.......................................................................................53
B.1 I條帶的巨宏塊類型................................................................................53
B.2 P條帶的巨宏塊類型...............................................................................54
附件C FFmpeg完整解碼函式呼叫圖.........................................................................55
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