{"id":3373,"date":"2021-07-13T15:31:38","date_gmt":"2021-07-13T07:31:38","guid":{"rendered":"http:\/\/123.57.164.21\/?p=3373"},"modified":"2021-07-13T15:38:26","modified_gmt":"2021-07-13T07:38:26","slug":"h264-h265%e7%a1%ac%e4%bb%b6%e7%bc%96%e8%a7%a3%e7%a0%81%e5%9f%ba%e7%a1%80%e5%8f%8a%e7%a0%81%e6%b5%81%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=3373","title":{"rendered":"H264, H265\u786c\u4ef6\u7f16\u89e3\u7801\u57fa\u7840\u53ca\u7801\u6d41\u5206\u6790"},"content":{"rendered":"\n
\"\"<\/figure><\/div>\n\n\n\n
\u9700\u6c42<\/h5>\n\n\n\n

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\u9605\u8bfb\u524d\u63d0:<\/h5>\n\n\n\n
  • \u97f3\u89c6\u9891\u57fa\u7840\u77e5\u8bc6<\/li>
  • iOS\u4e2dVideoToolbox\u6846\u67b6<\/li><\/ul>\n\n\n\n
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    \u4e3a\u4ec0\u4e48\u8981\u7f16\u7801<\/h5>\n\n\n\n

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    \u6570\u636e\u91cf\/\u6bcf\u79d2=1280*720*33*3\/1024\/1024=87MB\n<\/pre>\n\n\n\n
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    \u7f16\u7801\u6280\u672f<\/h5>\n\n\n\n
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    \u7f16\u7801\u5206\u7c7b<\/h5>\n\n\n\n
    • \u8f6f\u4ef6\u7f16\u7801(\u7b80\u79f0\u8f6f\u7f16)\uff1a\u4f7f\u7528CPU\u8fdb\u884c\u7f16\u7801\u3002<\/li>
    • \u786c\u4ef6\u7f16\u7801(\u7b80\u79f0\u786c\u7f16)\uff1a\u4e0d\u4f7f\u7528CPU\u8fdb\u884c\u7f16\u7801\uff0c\u4f7f\u7528\u663e\u5361GPU,\u4e13\u7528\u7684DSP\u3001FPGA\u3001ASIC\u82af\u7247\u7b49\u786c\u4ef6\u8fdb\u884c\u7f16\u7801\u3002<\/li><\/ul>\n\n\n\n
      \u4f18\u7f3a\u70b9<\/p>\n\n\n\n
      • \u8f6f\u7f16\uff1a\u5b9e\u73b0\u76f4\u63a5\u3001\u7b80\u5355\uff0c\u53c2\u6570\u8c03\u6574\u65b9\u4fbf\uff0c\u5347\u7ea7\u6613\uff0c\u4f46CPU\u8d1f\u8f7d\u91cd\uff0c\u6027\u80fd\u8f83\u786c\u7f16\u7801\u4f4e\uff0c\u4f4e\u7801\u7387\u4e0b\u8d28\u91cf\u901a\u5e38\u6bd4\u786c\u7f16\u7801\u8981\u597d\u4e00\u70b9\u3002<\/li>
      • \u786c\u7f16\uff1a\u6027\u80fd\u9ad8\uff0c\u4f4e\u7801\u7387\u4e0b\u901a\u5e38\u8d28\u91cf\u4f4e\u4e8e\u786c\u7f16\u7801\u5668\uff0c\u4f46\u90e8\u5206\u4ea7\u54c1\u5728GPU\u786c\u4ef6\u5e73\u53f0\u79fb\u690d\u4e86\u4f18\u79c0\u7684\u8f6f\u7f16\u7801\u7b97\u6cd5\uff08\u5982X264\uff09\u7684\uff0c\u8d28\u91cf\u57fa\u672c\u7b49\u540c\u4e8e\u8f6f\u7f16\u7801\u3002<\/li><\/ul>\n\n\n\n
        iOS\u7cfb\u7edf\u4e2d\u7684\u786c\u7f16\u7801<\/p>\n\n\n\n
        \u82f9\u679c\u5728iOS 8.0\u7cfb\u7edf\u4e4b\u524d\uff0c\u6ca1\u6709\u5f00\u653e\u7cfb\u7edf\u7684\u786c\u4ef6\u7f16\u7801\u89e3\u7801\u529f\u80fd\uff0c\u4e0d\u8fc7Mac OS\u7cfb\u7edf\u4e00\u76f4\u6709\uff0c\u88ab\u79f0\u4e3aVideo ToolBox\u7684\u6846\u67b6\u6765\u5904\u7406\u786c\u4ef6\u7684\u7f16\u7801\u548c\u89e3\u7801\uff0c\u7ec8\u4e8e\u5728iOS 8.0\u540e\uff0c\u82f9\u679c\u5c06\u8be5\u6846\u67b6\u5f15\u5165iOS\u7cfb\u7edf\u3002<\/p>\n\n\n\n
        \u7f16\u7801\u539f\u7406<\/h5>\n\n\n\n
        \u5bf9\u89c6\u9891\u6267\u884c\u7f16\u7801\u64cd\u4f5c\u540e,\u539f\u59cb\u89c6\u9891\u6570\u636e\u4f1a\u88ab\u538b\u7f29\u6210\u4e09\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u89c6\u9891\u5e27: I\u5e27,P\u5e27,B\u5e27.<\/p>\n\n\n\n
        • I\u5e27:\u5173\u952e\u5e27.\u5b8c\u6574\u7f16\u7801\u7684\u5e27.\u53ef\u4ee5\u7406\u89e3\u6210\u662f\u4e00\u5f20\u5b8c\u6574\u753b\u9762,\u4e0d\u4f9d\u8d56\u5176\u4ed6\u5e27<\/li>
        • P\u5e27:\u5411\u524d\u53c2\u8003\u5e27\uff0c\u5728\u538b\u7f29\u65f6\uff0c\u53ea\u53c2\u8003\u524d\u9762\u5df2\u7ecf\u5904\u7406\u7684\u5e27\u3002\u91c7\u7528\u5e27\u97f3\u538b\u7f29\u6280\u672f\u3002<\/li>
        • B\u5e27:\u53cc\u5411\u53c2\u8003\u5e27\uff0c\u5728\u538b\u7f29\u65f6\uff0c\u5b83\u5373\u53c2\u8003\u524d\u800c\u7684\u5e27\uff0c\u53c8\u53c2\u8003\u5b83\u540e\u9762\u7684\u5e27\u3002\u91c7\u7528\u5e27\u95f4\u538b\u7f29\u6280\u672f\u3002<\/li><\/ul>\n\n\n\n
          \u8865\u5145: I\u5e27\u7684\u538b\u7f29\u7387\u662f7\uff08\u8ddfJPG\u5dee\u4e0d\u591a\uff09\uff0cP\u5e27\u662f20\uff0cB\u5e27\u53ef\u4ee5\u8fbe\u523050. \u4f46\u662fiOS\u4e2d\u4e00\u822c\u4e0d\u5f00\u542fB\u5e27,\u56e0\u4e3aB\u5e27\u7684\u5b58\u5728\u4f1a\u5bfc\u81f4\u65f6\u95f4\u6233\u540c\u6b65\u8f83\u4e3a\u590d\u6742.<\/p><\/blockquote>\n\n\n\n
          \u9664\u4e86I\/P\/B\u5e27\u5916\uff0c\u8fd8\u6709\u56fe\u50cf\u5e8f\u5217GOP\u3002<\/p>\n\n\n\n
          GOP:\u4e24\u4e2aI\u5e27\u4e4b\u95f4\u662f\u4e00\u4e2a\u56fe\u50cf\u5e8f\u5217\uff0c\u5728\u4e00\u4e2a\u56fe\u50cf\u5e8f\u5217\u4e2d\u53ea\u6709\u4e00\u4e2aI\u5e27\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n
          \"\"<\/figure><\/div>\n\n\n\n
          \u4e24\u79cd\u6838\u5fc3\u7b97\u6cd5<\/p>\n\n\n\n
          • \u5e27\u5185\u538b\u7f29<\/li><\/ul>\n\n\n\n
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            \u5982\u4e0b\u56fe:\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u7b2c 1\u30012\u30013\u30014\u30015 \u5757\u7684\u7f16\u7801\u6765\u63a8\u6d4b\u548c\u8ba1\u7b97\u7b2c 6 \u5757\u7684\u7f16\u7801\uff0c\u56e0\u6b64\u5c31\u4e0d\u9700\u8981\u5bf9\u7b2c 6 \u5757\u8fdb\u884c\u7f16\u7801\u4e86\uff0c\u4ece\u800c\u538b\u7f29\u4e86\u7b2c 6 \u5757\uff0c\u8282\u7701\u4e86\u7a7a\u95f4<\/p>\n\n\n\n
            \"\"<\/figure><\/div>\n\n\n\n
            • \u5e27\u95f4\u538b\u7f29: P\u5e27\u4e0eB\u5e27\u7684\u538b\u7f29\u7b97\u6cd5<\/li><\/ul>\n\n\n\n
              \u76f8\u90bb\u51e0\u5e27\u7684\u6570\u636e\u6709\u5f88\u5927\u7684\u76f8\u5173\u6027\uff0c\u6216\u8005\u8bf4\u524d\u540e\u4e24\u5e27\u4fe1\u606f\u53d8\u5316\u5f88\u5c0f\u7684\u7279\u70b9\u3002\u4e5f\u5373\u8fde\u7eed\u7684\u89c6\u9891\u5176\u76f8\u90bb\u5e27\u4e4b\u95f4\u5177\u6709\u5197\u4f59\u4fe1\u606f,\u6839\u636e\u8fd9\u4e00\u7279\u6027\uff0c\u538b\u7f29\u76f8\u90bb\u5e27\u4e4b\u95f4\u7684\u5197\u4f59\u91cf\u5c31\u53ef\u4ee5\u8fdb\u4e00\u6b65\u63d0\u9ad8\u538b\u7f29\u91cf\uff0c\u51cf\u5c0f\u538b\u7f29\u6bd4\u3002\u5e27\u95f4\u538b\u7f29\u4e5f\u79f0\u4e3a\u65f6\u95f4\u538b\u7f29\uff08Temporal compression\uff09\uff0c\u5b83\u901a\u8fc7\u6bd4\u8f83\u65f6\u95f4\u8f74\u4e0a\u4e0d\u540c\u5e27\u4e4b\u95f4\u7684\u6570\u636e\u8fdb\u884c\u538b\u7f29\u3002\u5e27\u95f4\u538b\u7f29\u4e00\u822c\u662f\u65e0\u635f\u7684\u3002\u5e27\u5dee\u503c\uff08Frame differencing\uff09\u7b97\u6cd5\u662f\u4e00\u79cd\u5178\u578b\u7684\u65f6\u95f4\u538b\u7f29\u6cd5\uff0c\u5b83\u901a\u8fc7\u6bd4\u8f83\u672c\u5e27\u4e0e\u76f8\u90bb\u5e27\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u4ec5\u8bb0\u5f55\u672c\u5e27\u4e0e\u5176\u76f8\u90bb\u5e27\u7684\u5dee\u503c\uff0c\u8fd9\u6837\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u6570\u636e\u91cf\u3002<\/p>\n\n\n\n
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              \"\"<\/figure><\/div>\n\n\n\n
              \u6709\u635f\u538b\u7f29\u4e0e\u65e0\u635f\u538b\u7f29<\/p>\n\n\n\n
              • \u6709\u635f\u538b\u7f29: \u89e3\u538b\u7f29\u540e\u7684\u6570\u636e\u4e0e\u538b\u7f29\u524d\u7684\u6570\u636e\u4e0d\u4e00\u81f4.\u5728\u538b\u7f29\u7684\u8fc7\u7a0b\u4e2d\u8981\u4e22\u5931\u4e00\u4e9b\u4eba\u773c\u548c\u4eba\u8033\u6240\u4e0d\u654f\u611f\u7684\u56fe\u50cf\u6216\u97f3\u9891\u4fe1\u606f,\u800c\u4e14\u4e22\u5931\u7684\u4fe1\u606f\u4e0d\u53ef\u6062\u590d<\/li>
              • \u65e0\u635f\u538b\u7f29: \u538b\u7f29\u524d\u548c\u89e3\u538b\u7f29\u540e\u7684\u6570\u636e\u5b8c\u5168\u4e00\u81f4.\u4f18\u5316\u6570\u636e\u7684\u6392\u5217\u7b49.<\/li><\/ul>\n\n\n\n
                H264\u6982\u8ff0<\/strong><\/p>\n\n\n\n
                \"\"<\/figure><\/div>\n\n\n\n
                H264\u538b\u7f29\u6280\u672f\u4e3b\u8981\u91c7\u7528\u4e86\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\u5bf9\u89c6\u9891\u6570\u636e\u8fdb\u884c\u538b\u7f29\u3002\u5305\u62ec\uff1a<\/p>\n\n\n\n
                • \u5e27\u5185\u9884\u6d4b\u538b\u7f29\uff0c\u89e3\u51b3\u7684\u662f\u7a7a\u57df\u6570\u636e\u5197\u4f59\u95ee\u9898\u3002<\/li>
                • \u5e27\u95f4\u9884\u6d4b\u538b\u7f29\uff08\u8fd0\u52a8\u4f30\u8ba1\u4e0e\u8865\u507f\uff09\uff0c\u89e3\u51b3\u7684\u662f\u65f6\u57df\u6570\u636e\u5197\u5f90\u95ee\u9898\u3002\u3000\u3000<\/li>
                • \u6574\u6570\u79bb\u6563\u4f59\u5f26\u53d8\u6362\uff08DCT\uff09\uff0c\u5c06\u7a7a\u95f4\u4e0a\u7684\u76f8\u5173\u6027\u53d8\u4e3a\u9891\u57df\u4e0a\u65e0\u5173\u7684\u6570\u636e\u7136\u540e\u8fdb\u884c\u91cf\u5316\u3002\u3000\u3000<\/li>
                • CABAC\u538b\u7f29\u3002<\/li><\/ul>\n\n\n\n
                  \u7ecf\u8fc7\u538b\u7f29\u540e\u7684\u5e27\u5206\u4e3a\uff1aI\u5e27\uff0cP\u5e27\u548cB\u5e27<\/p>\n\n\n\n
                  H264\u538b\u7f29\u6280\u672f<\/strong><\/p>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
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                  \"\"<\/figure><\/div>\n\n\n\n
                  \u4e0b\u9762\u8fd9\u5e45\u56fe\u662f\u5bf9\u6574\u5e45\u56fe\u4e2d\u7684\u6bcf\u4e2a\u5b8f\u5757\u8fdb\u884c\u9884\u6d4b\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u5e27\u5185\u9884\u6d4b\u540e\u7684\u56fe\u50cf\u4e0e\u539f\u59cb\u56fe\u50cf\u7684\u5bf9\u6bd4\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u7136\u540e\uff0c\u5c06\u539f\u59cb\u56fe\u50cf\u4e0e\u5e27\u5185\u9884\u6d4b\u540e\u7684\u56fe\u50cf\u76f8\u51cf\u5f97\u6b8b\u5dee\u503c\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u518d\u5c06\u6211\u4eec\u4e4b\u524d\u5f97\u5230\u7684\u9884\u6d4b\u6a21\u5f0f\u4fe1\u606f\u4e00\u8d77\u4fdd\u5b58\u8d77\u6765\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u5728\u89e3\u7801\u65f6\u6062\u590d\u539f\u56fe\u4e86\u3002\u6548\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u7ecf\u8fc7\u5e27\u5185\u4e0e\u5e27\u95f4\u7684\u538b\u7f29\u540e\uff0c\u867d\u7136\u6570\u636e\u6709\u5927\u5e45\u51cf\u5c11\uff0c\u4f46\u8fd8\u6709\u4f18\u5316\u7684\u7a7a\u95f4\u3002<\/p>\n\n\n\n
                  \u5bf9\u6b8b\u5dee\u6570\u636e\u505aDCT<\/strong><\/p>\n\n\n\n
                  \u53ef\u4ee5\u5c06\u6b8b\u5dee\u6570\u636e\u505a\u6574\u6570\u79bb\u6563\u4f59\u5f26\u53d8\u6362\uff0c\u53bb\u6389\u6570\u636e\u7684\u76f8\u5173\u6027\uff0c\u8fdb\u4e00\u6b65\u538b\u7f29\u6570\u636e\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u5de6\u4fa7\u4e3a\u539f\u6570\u636e\u7684\u5b8f\u5757\uff0c\u53f3\u4fa7\u4e3a\u8ba1\u7b97\u51fa\u7684\u6b8b\u5dee\u6570\u636e\u7684\u5b8f\u5757\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u5c06\u6b8b\u5dee\u6570\u636e\u5b8f\u5757\u6570\u5b57\u5316\u540e\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u5c06\u6b8b\u5dee\u6570\u636e\u5b8f\u5757\u8fdb\u884c DCT \u8f6c\u6362\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u53bb\u6389\u76f8\u5173\u8054\u7684\u6570\u636e\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\u6570\u636e\u88ab\u8fdb\u4e00\u6b65\u538b\u7f29\u4e86\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u505a\u5b8c DCT \u540e\uff0c\u8fd8\u4e0d\u591f\uff0c\u8fd8\u8981\u8fdb\u884c CABAC \u8fdb\u884c\u65e0\u635f\u538b\u7f29\u3002<\/p>\n\n\n\n
                  DCT\u539f\u7406\u5927\u767d\u8bdd<\/strong><\/p>\n\n\n\n
                  \u8fd9\u662f\u7b2c\u4e00\u5e27\u753b\u9762\uff1aP1\uff08\u6211\u4eec\u7684\u53c2\u8003\u5e27\uff09<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u8fd9\u662f\u7b2c\u4e8c\u5e27\u753b\u9762\uff1aP2\uff08\u9700\u8981\u7f16\u7801\u7684\u5e27\uff09<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u4ece\u89c6\u9891\u4e2d\u622a\u53d6\u7684\u4e24\u5f20\u95f4\u96941-2\u79d2\u7684\u753b\u9762\uff0c\u548c\u5b9e\u9645\u60c5\u51b5\u7c7b\u4f3c\uff0c\u4e0b\u9762\u6211\u4eec\u8fdb\u884c\u51e0\u6b21\u8fd0\u52a8\u641c\u7d22\uff1a<\/p>\n\n\n\n
                  \u8fd9\u662f\u4e00\u4e2a\u6f14\u793a\u7a0b\u5e8f\uff0c\u9f20\u6807\u9009\u4e2dP2\u4e0a\u4efb\u610f16×16<\/strong>\u7684Block\uff0c\u5373\u53ef\u641c\u7d22\u51faP1\u4e0a\u7684 BestMatch<\/strong> \u5b8f\u5757\u3002\u867d\u7136\u8f66\u8f86\u5728\u8fd0\u52a8\uff0c\u4ece\u8fdc\u5230\u8fd1\uff0c\u4f46\u662f\u4f9d\u7136\u627e\u5230\u4e86\u6700\u63a5\u8fd1\u7684\u5b8f\u5757\u5750\u6807\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u641c\u7d22\u6f14\u793a2\uff1a\u7a7a\u4e2d\u7535\u7ebf\u4ea4\u53c9\u4f4d\u7f6e\uff08\u4e0a\u56feP1\uff0c\u4e0b\u56feP2\uff09<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u641c\u7d22\u6f14\u793a3\uff1a\u62a5\u520a\u505c\u7684\u5e7f\u544a\u6d77\u62a5<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u540c\u6837\u987a\u5229\u5728P1\u4e2d\u627e\u5230\u6700\u63a5\u8fd1P2\u91cc\u6d77\u62a5\u7684\u5b8f\u5757\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
                  \u56fe\u7247\u5168\u641c\u7d22\uff1a\u6839\u636eP1\u548c\u8fd0\u52a8\u77e2\u91cf\u6570\u636e\uff08\u5728P2\u4e2d\u641c\u7d22\u5230\u6bcf\u4e00\u4e2a\u5b8f\u5757\u5728P1\u4e2d\u6700\u76f8\u4f3c\u7684\u4f4d\u7f6e\u96c6\u5408\uff09\u8fd8\u539f\u51fa\u6765\u7684P2’\uff0c\u5373\u5b8c\u5168\u7528P1\u5404\u4e2a\u4f4d\u7f6e\u7684\u5b8f\u5757\u62fc\u51d1\u51fa\u6765\u6700\u50cfP2\u7684\u56fe\u7247P2’\uff0c\u6548\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u4ed4\u7ec6\u89c2\u5bdf\uff0c\u6709\u4e9b\u652f\u79bb\u7834\u788e\u5bf9\u5427\uff1f\u80af\u5b9a\u554a\uff0c\u62fc\u51d1\u51fa\u6765\u7684\u4e1c\u897f\u5c31\u662f\u8fd9\u6837\uff0c\u73b0\u5728\u6211\u4eec\u7528P2`\u548cP2\u50cf\u7d20\u76f8\u51cf\uff0c\u5f97\u5230\u5dee\u5206\u56fe D2 = (P2′ – P2) \/ 2 + 0x80\uff1a<\/strong><\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u8fd9\u5c31\u662f\u4e4b\u524d\u652f\u79bb\u7834\u788e\u7684 P2` \u52a0\u4e0a\u8bef\u5dee D2\u4e4b\u540e\u53d8\u6210\u4e86\u6e05\u6670\u53ef\u89c1\u7684\u6837\u5b50\uff0c\u57fa\u672c\u8fd8\u539f\u4e86\u539f\u56feP2\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u7531\u4e8eD2\u4ec5\u4ec5\u53605KB\uff0c\u52a0\u4e0a\u538b\u7f29\u8fc7\u540e\u7684\u8fd0\u52a8\u77e2\u91cf\u4e0d\u8fc77KB\uff0c\u6240\u4ee5\u53c2\u8003P1\u6211\u4eec\u53ea\u9700\u8981\u989d\u5916 7KB\u7684\u6570\u636e\u91cf\u5c31\u53ef\u4ee5\u5b8c\u6574\u8868\u793aP2\u4e86\uff0c\u800c\u5982\u679c\u72ec\u7acb\u5c06P2\u7528\u8d28\u91cf\u5c1a\u53ef\u7684\u6709\u635f\u538b\u7f29\u65b9\u5f0f\u72ec\u7acb\u538b\u7f29\uff0c\u5219\u81f3\u5c11\u8981\u53bb\u523050-60KB\uff0c\u8fd9\u4e00\u4e0b\u8282\u7701\u4e86\u5dee\u4e0d\u591a8\u500d\u7684\u7a7a\u95f4\uff0c\u6b63\u5c31\u662f\u6240\u8c13\u8fd0\u52a8\u7f16\u7801\u7684\u57fa\u672c\u539f\u7406\u3002<\/p>\n\n\n\n
                  \u5b9e\u9645\u5728\u4f7f\u7528\u4e2d\uff0c\u53c2\u8003\u5e27\u5e76\u4e0d\u4e00\u5b9a\u662f\u524d\u9762\u4e00\u5e27\uff0c\u4e5f\u4e0d\u4e00\u5b9a\u662f\u540c\u4e00\u4e2aGOP\u7684I\u5e27\uff0c\u56e0\u4e3aGOP\u95f4\u9694\u8f83\u957f\u65f6\uff0c\u540e\u9762\u7684\u56fe\u7247\u79bbI\u5e27\u53d8\u5316\u53ef\u80fd\u5df2\u7ecf\u5f88\u5927\u4e86\uff0c\u56e0\u6b64\u5e38\u89c1\u505a\u6cd5\u662f\u6700\u8fd115\u5e27\u4e2d\u9009\u62e9\u4e00\u5e27\u8bef\u5dee\u6700\u5c0f\u7684\u4f5c\u4e3a\u53c2\u8003\u5e27\uff0c\u867d\u7136\u5f69\u8272\u753b\u9762\u6709YUV\u4e09\u4e2a\u5206\u91cf\uff0c\u4f46\u662f\u5927\u91cf\u7684\u9884\u6d4b\u5de5\u4f5c\u548c\u6700\u6709\u9009\u62e9\u901a\u5e38\u662f\u6839\u636eY\u5206\u91cf\u7684\u7070\u5ea6\u5e27\u8fdb\u884c\u5224\u65ad\u7684\u3002<\/p>\n\n\n\n
                  \u518d\u8005\u8bef\u5dee\u6211\u4eec\u4fdd\u5b58\u7684\u662f\uff08P2-P2\u2019\uff09\/2 + 0x80\uff0c\u5b9e\u9645\u4f7f\u7528\u65f6\u6211\u4eec\u4f1a\u7528\u66f4\u6709\u6548\u7387\u7684\u65b9\u5f0f\uff0c\u6bd4\u5982\u8ba9[-64,64]\u4e4b\u95f4\u7684\u8272\u5dee\u7cbe\u5ea6\u4e3a1\uff0c[-255,-64], [64, 255] \u4e4b\u95f4\u7684\u8272\u5dee\u7cbe\u5ea6\u4e3a2-3\uff0c\u8fd9\u6837\u4f1a\u66f4\u52a0\u771f\u5b9e\u4e00\u4e9b\u3002<\/p>\n\n\n\n
                  \u540c\u65f6\u4e0a\u6587\u5f88\u591a\u5730\u65b9\u7528\u7684\u662f\u76f4\u63a5lzma2\u8fdb\u884c\u7b80\u5355\u5b58\u50a8\uff0c\u5b9e\u9645\u4f7f\u7528\u65f6\u4e00\u822c\u4f1a\u5f15\u5165\u71b5\u7f16\u7801\uff0c\u5bf9\u6570\u636e\u8fdb\u884c\u4e00\u5b9a\u5c42\u6b21\u7684\u6574\u7406\u7136\u540e\u518d\u538b\u7f29\uff0c\u6027\u80fd\u4f1a\u597d\u4e0d\u5c11\u3002<\/p>\n\n\n\n
                  CABAC<\/strong><\/p>\n\n\n\n
                  \u4e0a\u9762\u7684\u5e27\u5185\u538b\u7f29\u662f\u5c5e\u4e8e\u6709\u635f\u538b\u7f29\u6280\u672f\u3002\u4e5f\u5c31\u662f\u8bf4\u56fe\u50cf\u88ab\u538b\u7f29\u540e\uff0c\u65e0\u6cd5\u5b8c\u5168\u590d\u539f\u3002\u800cCABAC\u5c5e\u4e8e\u65e0\u635f\u538b\u7f29\u6280\u672f\u3002<\/p>\n\n\n\n
                  \u65e0\u635f\u538b\u7f29\u6280\u672f\u5927\u5bb6\u6700\u719f\u6089\u7684\u53ef\u80fd\u5c31\u662f\u54c8\u592b\u66fc\u7f16\u7801\u4e86\uff0c\u7ed9\u9ad8\u9891\u7684\u8bcd\u4e00\u4e2a\u77ed\u7801\uff0c\u7ed9\u4f4e\u9891\u8bcd\u4e00\u4e2a\u957f\u7801\u4ece\u800c\u8fbe\u5230\u6570\u636e\u538b\u7f29\u7684\u76ee\u7684\u3002MPEG-2\u4e2d\u4f7f\u7528\u7684VLC\u5c31\u662f\u8fd9\u79cd\u7b97\u6cd5\uff0c\u6211\u4eec\u4ee5 A-Z \u4f5c\u4e3a\u4f8b\u5b50\uff0cA\u5c5e\u4e8e\u9ad8\u9891\u6570\u636e\uff0cZ\u5c5e\u4e8e\u4f4e\u9891\u6570\u636e\u3002\u770b\u770b\u5b83\u662f\u5982\u4f55\u505a\u7684\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  CABAC\u4e5f\u662f\u7ed9\u9ad8\u9891\u6570\u636e\u77ed\u7801\uff0c\u7ed9\u4f4e\u9891\u6570\u636e\u957f\u7801\u3002\u540c\u65f6\u8fd8\u4f1a\u6839\u636e\u4e0a\u4e0b\u6587\u76f8\u5173\u6027\u8fdb\u884c\u538b\u7f29\uff0c\u8fd9\u79cd\u65b9\u5f0f\u53c8\u6bd4VLC\u9ad8\u6548\u5f88\u591a\u3002\u5176\u6548\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u73b0\u5728\u5c06 A-Z \u6362\u6210\u89c6\u9891\u5e27\uff0c\u5b83\u5c31\u6210\u4e86\u4e0b\u9762\u7684\u6837\u5b50\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  \u4ece\u4e0a\u9762\u8fd9\u5f20\u56fe\u4e2d\u660e\u663e\u53ef\u4ee5\u770b\u51fa\u91c7\u7528 CACBA \u7684\u65e0\u635f\u538b\u7f29\u65b9\u6848\u8981\u6bd4 VLC \u9ad8\u6548\u7684\u591a\u3002<\/p>\n\n\n\n
                  iOS\u4e2d\u7684\u89c6\u9891\u7f16\u89e3\u7801<\/h5>\n\n\n\n
                  iOS\u4e2d\u89c6\u9891\u5904\u7406\u6846\u67b6\u5206\u5c42<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  3.1. \u6846\u67b6\u7684\u9009\u62e9<\/p>\n\n\n\n
                  \u5bf9\u4e8e AVKit\u3001AVFoundation \u548c VideoToolbox \u6765\u8bf4\uff0c\u4ed6\u4eec\u7684\u529f\u80fd\u548c\u53ef\u5b9a\u5236\u6027\u8d8a\u6765\u8d8a\u5f3a\uff0c\u4f46\u76f8\u5e94\u7684\u4f7f\u7528\u96be\u5ea6\u4e5f\u8d8a\u5927\uff0c\u56e0\u6b64\u4f60\u5e94\u8be5\u6839\u636e\u5b9e\u9645\u9700\u6c42\u5408\u7406\u7684\u9009\u62e9\u4f7f\u7528\u54ea\u4e2a\u5c42\u7ea7\u7684\u63a5\u53e3\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5373\u4f7f\u4f60\u4f7f\u7528 AVFoundation \u6216 AVKit \u4f9d\u7136\u53ef\u4ee5\u83b7\u5f97\u786c\u4ef6\u52a0\u901f\u7684\u6548\u679c\uff0c\u4f60\u5931\u53bb\u7684\u53ea\u662f\u76f4\u63a5\u8bbf\u95ee\u786c\u7f16\u89e3\u7801\u5668\u7684\u6743\u9650\u3002\u5bf9\u4e8e VideoToolbox \u6765\u8bf4\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u76f4\u63a5\u8bbf\u95ee\u786c\u7f16\u89e3\u7801\u5668\uff0c\u5c06 H.264 \u6587\u4ef6\u6216\u4f20\u8f93\u6d41\u8f6c\u6362\u4e3a iOS \u4e0a\u7684 CMSampleBuffer \u5e76\u89e3\u7801\u6210 CVPixelBuffer\uff0c\u6216\u5c06\u4e3a\u538b\u7f29\u7684 CVPixelBuffer \u7f16\u7801\u6210 CMSampleBuffer\uff1a<\/p>\n\n\n\n
                  3.2. \u89c6\u9891\u6570\u636e\u7684\u5bb9\u5668<\/p>\n\n\n\n
                  \u8c03\u7528 AVCaptureSession \u62cd\u6444\u8f93\u51fa\u7684\u6bcf\u4e00\u5e27\u56fe\u50cf\u90fd\u4f1a\u88ab\u5305\u88c5\u6210 CMSampleBuffer \u5bf9\u8c61\uff0c\u901a\u8fc7\u8fd9\u4e2a CMSampleBuffer \u5bf9\u8c61\u4f60\u5c31\u53ef\u4ee5\u83b7\u53d6\u5230\u672a\u538b\u7f29\u7684 CVPixelBuffer \u5bf9\u8c61\uff1b\u5982\u679c\u8bfb\u53d6 H.264 \u6587\u4ef6\u4f60\u4e5f\u53ef\u4ee5\u83b7\u53d6\u6570\u636e\u751f\u6210\u538b\u7f29\u7684 CMBlockBuffer \u5bf9\u8c61\u5e76\u521b\u5efa\u4e00\u4e2a CMSampleBuffer \u5bf9\u8c61\u7ed9 VideoToolbox \u6765\u89e3\u7801\u3002<\/p>\n\n\n\n
                  \u4e5f\u5c31\u662f\u8bf4\uff0cCMSampleBuffer \u65e2\u53ef\u4ee5\u4f5c\u4e3a CVPixelBuffer \u5bf9\u8c61\u7684\u5bb9\u5668\uff0c\u4e5f\u53ef\u4ee5\u4f5c\u4e3a CMBlockBuffer \u5bf9\u8c61\u7684\u5bb9\u5668\uff0cCVPixelBuffer \u53ef\u4ee5\u8bf4\u662f\u672a\u538b\u7f29\u7684\u56fe\u50cf\u6570\u636e\u5bb9\u5668\uff0c\u800c CMBlockBuffer \u5219\u662f\u538b\u7f29\u56fe\u50cf\u6570\u636e\u5bb9\u5668\u3002<\/p>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  3.3. \u7f16\u7801\u6570\u636e\u88f8\u6d41<\/p>\n\n\n\n
                  NALU. \u5bf9\u4e8e\u4e00\u4e2a H.264 \u88f8\u6d41\u6216\u8005\u6587\u4ef6\u6765\u8bf4\uff0c\u5b83\u662f\u7531\u4e00\u4e2a\u4e00\u4e2a\u7684 NALU(Network Abstraction Layer Unit) \u5355\u5143\u7ec4\u6210\uff0c\u6bcf\u4e2a NALU \u65e2\u53ef\u4ee5\u8868\u793a\u56fe\u50cf\u6570\u636e\uff0c\u4e5f\u53ef\u4ee5\u8868\u793a\u5904\u7406\u56fe\u50cf\u6240\u9700\u8981\u7684\u53c2\u6570\u6570\u636e\u3002\u5b83\u4e3b\u8981\u6709\u4e24\u79cd\u683c\u5f0f\uff1aAnnex B \u548c AVCC\u3002\u4e5f\u88ab\u79f0\u4e3a Elementary Stream \u548c MPEG-4 \u683c\u5f0f\uff0cAnnex B \u683c\u5f0f\u4ee5 0x000001 \u6216 0x00000001 \u5f00\u5934\uff0cAVCC \u683c\u5f0f\u4ee5\u6240\u5728\u7684 NALU \u7684\u957f\u5ea6\u5f00\u5934\u3002<\/p>\n\n\n\n
                  3.4. VideoToolBox\u4e2d\u5e38\u7528\u6570\u636e\u7ed3\u6784<\/p>\n\n\n\n
                  • CMSampleBuffer: \u5b58\u653e\u7f16\u89e3\u7801\u524d\u540e\u7684\u89c6\u9891\u56fe\u50cf\u7684\u5bb9\u5668\u6570\u636e\u7ed3\u6784<\/li>
                  • CVPixelBuffer: \u7f16\u7801\u524d\u548c\u89e3\u7801\u540e\u7684\u56fe\u50cf\u6570\u636e\u7ed3\u6784<\/li>
                  • CMBlockBuffer: \u7f16\u7801\u540e\u56fe\u50cf\u7684\u6570\u636e\u7ed3\u6784<\/li>
                  • CMVideoFormatDescription: \u56fe\u50cf\u5b58\u50a8\u65b9\u5f0f\uff0c\u7f16\u89e3\u7801\u5668\u7b49\u683c\u5f0f\u63cf\u8ff0<\/li>
                  • pixelBufferAttributes: : CFDictionary\u5bf9\u8c61\uff0c\u53ef\u80fd\u5305\u542b\u4e86\u89c6\u9891\u7684\u5bbd\u9ad8\uff0c\u50cf\u7d20\u683c\u5f0f\u7c7b\u578b\uff0832RGBA, YCbCr420\uff09\uff0c\u662f\u5426\u53ef\u4ee5\u7528\u4e8eOpenGL ES\u7b49\u76f8\u5173\u4fe1\u606f<\/li>
                  • CMTime: \u65f6\u95f4\u6233\u76f8\u5173\u3002\u65f6\u95f4\u4ee5 64-big\/32-bit\u5f62\u5f0f\u51fa\u73b0\u3002 \u5206\u5b50\u662f64-bit\u7684\u65f6\u95f4\u503c\uff0c\u5206\u6bcd\u662f32-bit\u7684\u65f6\u6807(time scale)<\/li>
                  • <\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"
                    \u9700\u6c42 \u5728\u79fb\u52a8\u7aef\u505a\u97f3\u89c6\u9891\u5f00\u53d1\u4e0d\u540c\u4e8e\u57fa\u672c\u7684UI\u4e1a\u52a1\u903b\u8f91\u5de5\u4f5c,\u97f3\u89c6\u9891\u5f00\u53d1\u9700\u8981\u4f60\u61c2\u5f97\u97f3\u89c6\u9891\u4e2d\u4e00\u4e9b\u57fa\u672c\u6982\u5ff5,\u9488\u5bf9\u7f16\u89e3\u7801\u800c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/3373"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3373"}],"version-history":[{"count":34,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/3373\/revisions"}],"predecessor-version":[{"id":3458,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/3373\/revisions\/3458"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}