{"id":67,"date":"2012-07-29T12:55:05","date_gmt":"2012-07-29T04:55:05","guid":{"rendered":"http:\/\/www.datarelab.com\/blog\/?p=67"},"modified":"2012-07-29T12:55:05","modified_gmt":"2012-07-29T04:55:05","slug":"flv%20%e6%96%87%e4%bb%b6%e6%a0%bc%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.datarelab.com\/blog\/Technical_literature\/67.html","title":{"rendered":"FLV \u6587\u4ef6\u683c\u5f0f"},"content":{"rendered":"

    FLV\uff08Flash Video\uff09\u662f\u73b0\u5728\u975e\u5e38\u6d41\u884c\u7684\u6d41\u5a92\u4f53\u683c\u5f0f\uff0c\u7531\u4e8e\u5176\u89c6\u9891\u6587\u4ef6\u4f53\u79ef\u8f7b\u5de7\u3001\u5c01\u88c5\u64ad\u653e\u7b80\u5355\u7b49\u7279\u70b9\uff0c\u4f7f\u5176\u5f88\u9002\u5408\u5728\u7f51\u7edc\u4e0a\u8fdb\u884c\u5e94\u7528\uff0c\u76ee\u524d\u4e3b\u6d41\u7684\u89c6\u9891\u7f51\u7ad9\u65e0\u4e00\u4f8b\u5916\u5730\u4f7f\u7528\u4e86FLV\u683c\u5f0f\u3002\u53e6\u5916\u7531\u4e8e\u5f53\u524d\u6d4f\u89c8\u5668\u4e0eFlash Player\u7d27\u5bc6\u7684\u7ed3\u5408\uff0c\u4f7f\u5f97\u7f51\u9875\u64ad\u653eFLV\u89c6\u9891\u8f7b\u800c\u6613\u4e3e\uff0c\u4e5f\u662fFLV\u6d41\u884c\u7684\u539f\u56e0\u4e4b\u4e00\u3002
\n    FLV\u89c6\u9891\u683c\u5f0f\u662fAdobe\u516c\u53f8\u8bbe\u8ba1\u5f00\u53d1\u7684\uff0c\u76ee\u524d\u5df2\u7ecf\u514d\u8d39\u5f00\u653e\uff0c\u73b0\u5728\u7684\u7248\u672c\u662fv10\u3002\u4e0b\u9762\u6211\u4eec\u5c31\u4e86\u89e3\u4e00\u4e0bFLV\u6587\u4ef6\u683c\u5f0f\u3002
\n    FLV\u662f\u6d41\u5a92\u4f53\u5c01\u88c5\u683c\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u6570\u636e\u770b\u4e3a\u4e8c\u8fdb\u5236\u5b57\u8282\u6d41\u3002\u603b\u4f53\u4e0a\u770b\uff0cFLV\u5305\u62ec\u6587\u4ef6\u5934\uff08File Header\uff09\u548c\u6587\u4ef6\u4f53\uff08File Body\uff09\u4e24\u90e8\u5206\uff0c\u5176\u4e2d\u6587\u4ef6\u4f53\u7531\u4e00\u7cfb\u5217\u7684Tag\u53caTag Size\u5bf9\u7ec4\u6210\u3002\u56e0\u6b64\u4e00\u4e2aFLV\u6587\u4ef6\u770b\u4e0a\u53bb\u662f\u4e0b\u9762\u7684\u7ed3\u6784\uff1a<\/p>\n

\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/p>\n

    \u5176\u4e2d\uff0cPrevious Tag Size\u7d27\u8ddf\u5728\u6bcf\u4e2aTag\u4e4b\u540e\uff0c\u53604\u4e2a\u5b57\u8282\u8868\u793a\u4e00\u4e2aUI32\u7c7b\u578b\u7684\u6570\u503c\uff0c\u8868\u793a\u524d\u9762\u4e00\u4e2aTag\u7684\u5927\u5c0f\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cPrevious Tag Size #0\u7684\u503c\u603b\u662f\u4e3a0\u3002Tag\u7c7b\u578b\u5305\u62ec\u89c6\u9891\u3001\u97f3\u9891\u548cScript\uff0c\u4e14\u6bcf\u4e2aTag\u53ea\u80fd\u5305\u542b\u4e00\u79cd\u7c7b\u578b\u7684\u6570\u636e\u3002\u4e0b\u9762\u6211\u4eec\u770b\u770bFile Header\u548cTag\u7684\u5177\u4f53\u7ed3\u6784\uff0c\u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u7406\u89e3\uff0c\u6211\u8d34\u4e00\u4e2a\u5b9e\u9645FLV\u6587\u4ef6\u7684\u5b57\u8282\u6d41\u56fe\u7247\uff0c\u56fe\u7247\u4e2d\u628a\u4e0d\u540c\u90e8\u5206\u533a\u5206\u4e86\u989c\u8272\u3002<\/p>\n

\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/p>\n

 
\n\u4e00\u3001File Header\u7ed3\u6784
\n    File Header\u5728\u5f53\u524d\u7248\u672c\u4e2d\u603b\u662f\u75319\u4e2a\u5b57\u8282\u7ec4\u6210\uff0c\u5982\u56fe\u4e2d\u84dd\u8272\u533a\u57df\u6240\u793a\u3002
\n    \u7b2c1-3\u5b57\u8282\u4e3a\u6587\u4ef6\u6807\u8bc6\uff08Signature\uff09\uff0c\u603b\u4e3a\u201cFLV\u201d\uff080x46 0x4C 0x56\uff09\uff0c\u5982\u56fe\u4e2d\u7d2b\u8272\u533a\u57df\u3002
\n    \u7b2c4\u5b57\u8282\u4e3a\u7248\u672c\uff0c\u76ee\u524d\u4e3a1\uff080x01\uff09\u3002
\n    \u7b2c5\u4e2a\u5b57\u8282\u7684\u524d5\u4f4d\u4fdd\u7559\uff0c\u5fc5\u987b\u4e3a0\u3002
\n    \u7b2c5\u4e2a\u5b57\u8282\u7684\u7b2c6\u4f4d\u8868\u793a\u662f\u5426\u5b58\u5728\u97f3\u9891Tag\u3002
\n    \u7b2c5\u4e2a\u5b57\u8282\u7684\u7b2c7\u4f4d\u4fdd\u7559\uff0c\u5fc5\u987b\u4e3a0\u3002
\n    \u7b2c5\u4e2a\u5b57\u8282\u7684\u7b2c8\u4f4d\u8868\u793a\u662f\u5426\u5b58\u5728\u89c6\u9891Tag\u3002
\n    \u7b2c6-9\u4e2a\u5b57\u8282\u4e3aUI32\u7c7b\u578b\u7684\u503c\uff0c\u8868\u793a\u4eceFile Header\u5f00\u59cb\u5230File Body\u5f00\u59cb\u7684\u5b57\u8282\u6570\uff0c\u7248\u672c1\u4e2d\u603b\u4e3a9\u3002
\n 
\n\u4e8c\u3001Previous Tag Size\u7ed3\u6784
\n    \u5982\u56fe\u4e2d\u7ea2\u8272\u4f4d\u7f6e\u6240\u793a\u3002
\n 
\n\u4e09\u3001Tag\u7ed3\u6784
\n    Tag\u5305\u62ecTag Header\u548cTag Data\u4e24\u90e8\u5206\u3002\u4e0d\u540c\u7c7b\u578b\u7684Tag\u7684Header\u7ed3\u6784\u662f\u76f8\u540c\u7684\uff0c\u4f46\u662fData\u7ed3\u6784\u5404\u4e0d\u76f8\u540c\u3002\u5982\u56fe\u4e2d\u7eff\u8272\u548c\u9ec4\u8272\u533a\u57df\u5206\u522b\u8868\u793aTag Header\u6570\u636e\u548cTag Data\u6570\u636e\u3002
\n    \u5f53\u524d\u7248\u672c\u7684Tag Header\u7ed3\u6784\u5360\u752811\u4e2a\u5b57\u8282\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u8868\u793aTag\u7c7b\u578b\uff0c\u5305\u62ec\u97f3\u9891\uff080x08\uff09\u3001\u89c6\u9891\uff080x09\uff09\u548cscript data\uff080x12\uff09\uff0c\u5176\u4ed6\u7c7b\u578b\u503c\u88ab\u4fdd\u7559\u3002
\n    \u7b2c2-4\u5b57\u8282\u4e3aUI24\u7c7b\u578b\u7684\u503c\uff0c\u8868\u793a\u8be5Tag Data\u90e8\u5206\u7684\u5927\u5c0f\u3002
\n    \u7b2c5-7\u5b57\u8282\u4e3aUI24\u7c7b\u578b\u7684\u503c\uff0c\u8868\u793a\u8be5Tag\u7684\u65f6\u95f4\u6233\uff08\u5355\u4f4d\u4e3ams\uff09\uff0c\u7b2c\u4e00\u4e2aTag\u7684\u65f6\u95f4\u6233\u603b\u662f0\u3002
\n    \u7b2c8\u4e2a\u5b57\u8282\u4e3a\u65f6\u95f4\u6233\u7684\u6269\u5c55\u5b57\u8282\uff0c\u5f5324\u4f4d\u6570\u503c\u4e0d\u591f\u65f6\uff0c\u8be5\u5b57\u8282\u4f5c\u4e3a\u6700\u9ad8\u4f4d\u5c06\u65f6\u95f4\u6233\u6269\u5c55\u4e3a32\u4f4d\u503c\u3002
\n    \u7b2c9-11\u5b57\u8282\u4e3aUI24\u7c7b\u578b\u7684\u503c\uff0c\u8868\u793astream id\uff0c\u603b\u662f0\u3002
\n    \u540e\u9762\u7684\u5b57\u8282\u4e3aTag Data\u6570\u636e\uff0cData\u7684\u5927\u5c0f\u7531\u7b2c2-4\u5b57\u8282\u7684\u6570\u503c\u6307\u793a\uff0c\u6839\u636e\u7b2c1\u4e2a\u5b57\u8282\u6307\u793a\u7684Tag\u7c7b\u578b\uff0c\u6309\u7167\u4e0d\u540c\u7684\u7ed3\u6784\u89e3\u6790Tag Data\u3002\u4e0b\u9762\u5206\u522b\u4ecb\u7ecd\u3002
\n 
\n\u56db\u3001Audio Tag Data\u7ed3\u6784
\n    \u97f3\u9891Tag\u5f00\u59cb\u7684\u7b2c1\u4e2a\u5b57\u8282\u5305\u542b\u4e86\u97f3\u9891\u6570\u636e\u7684\u53c2\u6570\u4fe1\u606f\uff0c\u4ece\u7b2c2\u4e2a\u5b57\u8282\u5f00\u59cb\u4e3a\u97f3\u9891\u6d41\u6570\u636e\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u7684\u524d4\u4f4d\u7684\u6570\u503c\u8868\u793a\u4e86\u97f3\u9891\u6570\u636e\u683c\u5f0f\uff0c\u5404\u503c\u4ee3\u8868\u7684\u610f\u4e49\u5927\u5bb6\u53ef\u4ee5\u67e5\u9605Adobe\u516c\u53f8\u53d1\u5e03\u7684FLV\u683c\u5f0f\u8bf4\u660e\u6587\u6863\uff08\u53ef\u4ee5\u5230\u6211\u7684\u78c1\u76d8\u7a7a\u95f4\u7684\u201c\u8d44\u6599\u201d\u76ee\u5f55\u53bb\u4e0b\u8f7d http:\/\/e.ys168.com\/?tinyfun<\/a>\uff09\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u7684\u7b2c5-6\u4f4d\u7684\u6570\u503c\u8868\u793a\u91c7\u6837\u7387\uff0c0 = 5.5 kHz\uff0c1 = 11 kHz\uff0c2 = 22 kHz\uff0c3 = 44 kHz\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u7684\u7b2c7\u4f4d\u8868\u793a\u91c7\u6837\u7cbe\u5ea6\uff0c0 = 8bits\uff0c1 = 16bits\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u7684\u7b2c8\u4f4d\u8868\u793a\u97f3\u9891\u7c7b\u578b\uff0c0 = mono\uff0c1 = stereo\u3002
\n 
\n\u4e94\u3001Video Tag Data\u7ed3\u6784
\n    \u89c6\u9891Tag\u4e5f\u7528\u5f00\u59cb\u7684\u7b2c1\u4e2a\u5b57\u8282\u5305\u542b\u89c6\u9891\u6570\u636e\u7684\u53c2\u6570\u4fe1\u606f\uff0c\u4ece\u7b2c2\u4e2a\u5b57\u8282\u5f00\u59cb\u4e3a\u89c6\u9891\u6d41\u6570\u636e\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u7684\u524d4\u4f4d\u7684\u6570\u503c\u8868\u793a\u5e27\u7c7b\u578b\u3002
\n    \u7b2c1\u4e2a\u5b57\u8282\u7684\u540e4\u4f4d\u7684\u6570\u503c\u8868\u793a\u89c6\u9891\u7f16\u7801ID\uff0c1 = JPEG\uff08\u73b0\u5df2\u4e0d\u7528\uff09\uff0c2 = Sorenson H.263\uff0c3 = Screen video\uff0c4 = On2 VP6\uff0c5 = On2 VP6 with alpha channel\uff0c6 = Screen video version 2\u3002
\n 
\n\u516d\u3001Script Tag Data\u7ed3\u6784
\n    \u8be5\u7c7b\u578bTag\u53c8\u901a\u5e38\u88ab\u79f0\u4e3aMetadata Tag\uff0c\u4f1a\u653e\u4e00\u4e9b\u5173\u4e8eFLV\u89c6\u9891\u548c\u97f3\u9891\u7684\u53c2\u6570\u4fe1\u606f\uff0c\u5982duration\u3001width\u3001height\u7b49\u3002\u901a\u5e38\u8be5\u7c7b\u578bTag\u4f1a\u8ddf\u5728File Header\u540e\u9762\u4f5c\u4e3a\u7b2c\u4e00\u4e2aTag\u51fa\u73b0\uff0c\u800c\u4e14\u53ea\u6709\u4e00\u4e2a\u3002
\n    \u4e00\u822c\u6765\u8bf4\uff0c\u8be5Tag Data\u7ed3\u6784\u5305\u542b\u4e24\u4e2aAMF\u5305\u3002AMF\uff08Action Message Format\uff09\u662fAdobe\u8bbe\u8ba1\u7684\u4e00\u79cd\u901a\u7528\u6570\u636e\u5c01\u88c5\u683c\u5f0f\uff0c\u5728Adobe\u7684\u5f88\u591a\u4ea7\u54c1\u4e2d\u5e94\u7528\uff0c\u7b80\u5355\u6765\u8bf4\uff0cAMF\u5c06\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u7528\u7edf\u4e00\u7684\u683c\u5f0f\u6765\u63cf\u8ff0\u3002\u7b2c\u4e00\u4e2aAMF\u5305\u5c01\u88c5\u5b57\u7b26\u4e32\u7c7b\u578b\u6570\u636e\uff0c\u7528\u6765\u88c5\u5165\u4e00\u4e2a\u201conMetaData\u201d\u6807\u5fd7\uff0c\u8fd9\u4e2a\u6807\u5fd7\u4e0eAdobe\u7684\u4e00\u4e9bAPI\u8c03\u7528\u6709\uff0c\u5728\u6b64\u4e0d\u7ec6\u8ff0\u3002\u7b2c\u4e8c\u4e2aAMF\u5305\u5c01\u88c5\u4e00\u4e2a\u6570\u7ec4\u7c7b\u578b\uff0c\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u5305\u542b\u4e86\u97f3\u89c6\u9891\u4fe1\u606f\u9879\u7684\u540d\u79f0\u548c\u503c\u3002\u5177\u4f53\u8bf4\u660e\u5982\u4e0b\uff0c\u5927\u5bb6\u53ef\u4ee5\u53c2\u7167\u56fe\u7247\u4e0a\u7684\u6570\u636e\u8fdb\u884c\u7406\u89e3\u3002
\n 
\n    \u7b2c\u4e00\u4e2aAMF\u5305\uff1a
\n       \u7b2c1\u4e2a\u5b57\u8282\u8868\u793aAMF\u5305\u7c7b\u578b\uff0c\u4e00\u822c\u603b\u662f0x02\uff0c\u8868\u793a\u5b57\u7b26\u4e32\uff0c\u5176\u4ed6\u503c\u8868\u793a\u610f\u4e49\u8bf7\u67e5\u9605\u6587\u6863\u3002
\n       \u7b2c2-3\u4e2a\u5b57\u8282\u4e3aUI16\u7c7b\u578b\u503c\uff0c\u8868\u793a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u4e00\u822c\u603b\u662f0x000A\uff08\u201conMetaData\u201d\u957f\u5ea6\uff09\u3002
\n       \u540e\u9762\u5b57\u8282\u4e3a\u5b57\u7b26\u4e32\u6570\u636e\uff0c\u4e00\u822c\u603b\u4e3a\u201conMetaData\u201d\u3002
\n 
\n    \u7b2c\u4e8c\u4e2aAMF\u5305\uff1a
\n       \u7b2c1\u4e2a\u5b57\u8282\u8868\u793aAMF\u5305\u7c7b\u578b\uff0c\u4e00\u822c\u603b\u662f0x08\uff0c\u8868\u793a\u6570\u7ec4\u3002
\n       \u7b2c2-5\u4e2a\u5b57\u8282\u4e3aUI32\u7c7b\u578b\u503c\uff0c\u8868\u793a\u6570\u7ec4\u5143\u7d20\u7684\u4e2a\u6570\u3002
\n       \u540e\u9762\u5373\u4e3a\u5404\u6570\u7ec4\u5143\u7d20\u7684\u5c01\u88c5\uff0c\u6570\u7ec4\u5143\u7d20\u4e3a\u5143\u7d20\u540d\u79f0\u548c\u503c\u7ec4\u6210\u7684\u5bf9\u3002\u8868\u793a\u65b9\u6cd5\u5982\u4e0b\uff1a
\n       \u7b2c1-2\u4e2a\u5b57\u8282\u8868\u793a\u5143\u7d20\u540d\u79f0\u7684\u957f\u5ea6\uff0c\u5047\u8bbe\u4e3aL\u3002
\n       \u540e\u9762\u8ddf\u7740\u4e3a\u957f\u5ea6\u4e3aL\u7684\u5b57\u7b26\u4e32\u3002
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