{"id":436064,"date":"2021-04-18T19:37:25","date_gmt":"2021-04-18T11:37:25","guid":{"rendered":"http:\/\/4563.org\/?p=436064"},"modified":"2021-04-18T19:37:25","modified_gmt":"2021-04-18T11:37:25","slug":"%e9%98%bf%e9%87%8c%e4%ba%91-rtc-qos-%e5%bc%b1%e7%bd%91%e5%af%b9%e6%8a%97%e4%b9%8b%e5%8f%98%e5%88%86%e8%be%a8%e7%8e%87%e7%bc%96%e7%a0%81","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=436064","title":{"rendered":"\u963f\u91cc\u4e91 RTC QoS \u5f31\u7f51\u5bf9\u6297\u4e4b\u53d8\u5206\u8fa8\u7387\u7f16\u7801"},"content":{"rendered":"
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\u963f\u91cc\u4e91 RTC QoS \u5f31\u7f51\u5bf9\u6297\u4e4b\u53d8\u5206\u8fa8\u7387\u7f16\u7801 <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : VideoCloudTech <\/span> <\/i> 12<\/span> <\/div>\n
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\u4f5c\u8005\uff5c\u5b89\u57fa\u7a0b\u3001\u7530\u4f1f\u5cf0<\/p>\n

\u5ba1\u6821\uff5c \u6cf0\u4e00<\/p>\n

\u89c6\u9891\u7f16\u7801\u4e2d\u7684\u53d8\u5206\u8fa8\u7387\u95ee\u9898\u53ca\u89e3\u51b3<\/h2>\n

\u53d8\u5206\u8fa8\u7387\u5728\u5f31\u7f51\u573a\u666f\u7684\u5b9e\u9645\u5e94\u7528\u4e2d\u975e\u5e38\u5e38\u89c1\uff0c\u7f51\u7edc\u72b6\u51b5\u4e0d\u597d\u7684\u65f6\u5019\u964d\u4f4e\u5206\u8fa8\u7387\u53ef\u4ee5\u964d\u4f4e\u7801\u7387\uff0c\u51cf\u5c11\u5757\u6548\u5e94\uff0c\u7f51\u7edc\u597d\u7684\u65f6\u5019\u589e\u52a0\u5206\u8fa8\u7387\u53ef\u4ee5\u63d0\u5347\u6e05\u6670\u5ea6\u53ca\u4e3b\u89c2\u4f53\u9a8c\u3002<\/p>\n

\u76ee\u524d\u4e3b\u6d41\u7684\u89c6\u9891\u7f16\u7801\u6807\u51c6\uff0c\u6bd4\u5982 H.264 \u3001H.265 \uff0c\u5728\u7f16\u7801\u8fc7\u7a0b\u4e2d\u5982\u679c\u8981\u8fdb\u884c\u5206\u8fa8\u7387\u5207\u6362\uff0c\u5219\u5fc5\u987b\u8981\u5148\u7f16\u7801\u4e00\u4e2a I \u5e27\uff0c\u800c I \u5e27\u53ea\u80fd\u4f7f\u7528\u5e27\u5185\u9884\u6d4b\uff0c\u7f16\u7801\u6548\u7387\u4f4e\u4e0b\u3002\u8fd9\u5728\u5f31\u7f51\u53d8\u5206\u8fa8\u7387\u7684\u65f6\u5019\u5c31\u5bb9\u6613\u9020\u6210\u5361\u987f\u3002\u4e0b\u56fe\u4e2d\u5c55\u793a\u4e86\u6bcf\u79d2\u949f\u5207\u6362\u5206\u8fa8\u7387\u7684\u7801\u7387\u6ce2\u52a8\u6548\u679c\uff0c\u9ad8\u4f4e\u4e24\u4e2a\u5206\u8fa8\u7387\uff0c\u6bcf\u79d2\u949f\u5207\u6362\u4e00\u6b21\u3002<\/p>\n

\"\u963f\u91cc\u4e91<\/p>\n

\u4e0a\u56fe\u4e2d\u6a2a\u5750\u6807\u8868\u793a\u7f16\u7801\u7684\u5e27\u6570\uff0c\u7eb5\u5750\u6807\u8868\u793a\u6bcf\u5e27\u7684\u5927\u5c0f\uff0c\u56fe\u4e2d\u6700\u9ad8\u7684 4 \u4e2a\u5c16\u5cf0\u8868\u793a\u4ece\u4f4e\u5206\u8fa8\u7387\u5207\u6362\u5230\u9ad8\u5206\u8fa8\u7387\u65f6\u7f16\u7684 I \u5e27\uff0c\u5728\u8fd9 4 \u4e2a\u5c16\u5cf0\u4e2d\u95f4\u7684\u8f83\u4f4e\u5c16\u5cf0\u662f\u4ece\u9ad8\u5206\u8fa8\u7387\u5207\u6362\u5230\u4f4e\u5206\u8fa8\u7387\u7f16\u7801\u7684 I \u5e27\u3002\u53ef\u89c1\u7f16\u7801 I \u5e27\u5e26\u6765\u7684\u7801\u7387\u6ce2\u52a8\u8fd8\u662f\u975e\u5e38\u660e\u663e\u7684\uff0c\u8fd9\u5728\u5f31\u7f51\u4e0b\u5c31\u5f88\u6709\u53ef\u80fd\u9020\u6210\u5982\u4e0b\u56fe\u6240\u793a\u7684\u5361\u987f\u3002<\/p>\n

https:\/\/v.youku.com\/v_show\/id_XNTEzMTY3MzU5Ng==.html<\/p>\n

\u89c6\u9891\u4e2d\u5de6\u4e00\u7684\u7537\u58eb\u5728\u4f38\u624b\u521a\u63a5\u5230\u5de6\u4e09\u5973\u58eb\u9012\u51fa\u7684\u4f20\u5355\u4e4b\u65f6\u8fdb\u5165\u5f31\u7f51\uff0c\u5207\u6362\u5206\u8fa8\u7387\uff0c\u4ea7\u751f\u4e86\u5361\u987f\u3002<\/p>\n

\u65b0\u4e00\u4ee3\u7684\u538b\u7f29\u6807\u51c6\uff0c\u5982 VP9 \u3001AV1 \u3001VVC\/H.266 \u7b49\u90fd\u652f\u6301\u5728\u505a\u5e27\u95f4\u9884\u6d4b\u7684\u65f6\u5019\u5f53\u524d\u5e27\u548c\u5176\u53c2\u8003\u5e27\u4f7f\u7528\u4e0d\u540c\u7684\u5206\u8fa8\u7387\uff0c\u5176\u57fa\u672c\u601d\u60f3\u662f\u5bf9\u53c2\u8003\u5e27\u505a\u91cd\u91c7\u6837 (re-sampling) \u4ee5\u4f7f\u5f97\u5176\u548c\u5f53\u524d\u5e27\u7684\u5206\u8fa8\u7387\u5339\u914d\uff0c\u4ece\u800c\u8fdb\u884c\u5e27\u95f4\u9884\u6d4b\uff0c\u4ee5\u5b9e\u73b0\u5206\u8fa8\u7387\u5207\u6362\u7684\u65f6\u5019\u4e0d\u7528\u7f16 I \u5e27\u7684\u76ee\u7684\u3002<\/p>\n

\u963f\u91cc\u4e91 RTC codec \u7684\u53d8\u5206\u8fa8\u7387\u7f16\u7801 (resolution change coding, \u4ee5\u4e0b\u7b80\u79f0 RCC) \u4e5f\u4f7f\u7528\u548c\u4e0a\u8ff0\u6807\u51c6\u7c7b\u4f3c\u7684\u57fa\u672c\u601d\u60f3\uff0c\u901a\u8fc7\u53c2\u8003\u5e27\u91cd\u91c7\u6837\u7b49\u624b\u6bb5\u4f7f\u5f97\u4e4b\u524d\u5df2\u7f16\u7801\u7684\u5176\u4ed6\u5206\u8fa8\u7387\u7684\u53c2\u8003\u5e27\u4e5f\u80fd\u4e3a\u5f53\u524d\u5e27\u6240\u7528\uff0c\u7ef4\u6301\u5e27\u95f4\u7684\u53c2\u8003\u94fe\u4e0d\u65ad\uff0c\u5145\u5206\u5229\u7528\u5e27\u95f4\u4fe1\u606f\u5197\u4f59\u63d0\u5347\u538b\u7f29\u6548\u7387\uff0c\u7701\u53bb\u7f16\u7801\u6548\u7387\u4f4e\u4e0b\u7684 I \u5e27\u3002<\/p>\n

Codec level \u538b\u7f29\u6027\u80fd\u6d4b\u8bd5<\/h2>\n

\u672c\u6587\u5bf9\u963f\u91cc\u4e91 RTC codec \u7684 RCC \u7279\u6027\u8fdb\u884c\u6d4b\u8bd5\uff0c\u4f7f\u7528 6 \u4e2a\u89c6\u9891\u4f1a\u8bae\u5e8f\u5217\uff08\u80cc\u666f\u4e0d\u52a8\uff0c\u8fd0\u52a8\u5e45\u5ea6\u8f83\u5c0f\uff09\uff0c\u548c 5 \u4e2a\u8fd0\u52a8\u7a0b\u5ea6\u8f83\u5927\u7684\u5e8f\u5217\uff0c\u9ad8\u4f4e\u4e24\u4e2a\u5206\u8fa8\u7387\uff0c\u4e00\u79d2\u949f\u5207\u6362\u4e00\u6b21\uff0c\u53ea\u8bc4\u4ef7\u5206\u8fa8\u7387\u5207\u6362\u5e27\u7684\u7801\u7387\u548c\u89c6\u9891\u8d28\u91cf\uff0c\u56e0\u4e3a\u5bf9\u4e8e\u540e\u7eed\u7684\u5e27\uff0c\u4f7f\u7528 RCC \u4e0e\u5426\uff0c\u7f16\u7801\u65b9\u5f0f\u5e76\u6ca1\u6709\u53d8\u5316\u3002<\/p>\n

\u5bf9\u4e8e\u89c6\u9891\u4f1a\u8bae\u5e8f\u5217\uff0c\u76f8\u540c\u89c6\u9891\u8d28\u91cf\u4e0b\u7801\u7387\u6709 70% \u8282\u7701\uff0c\u5bf9\u4e8e\u8fd0\u52a8\u5e8f\u5217\uff0c\u76f8\u540c\u89c6\u9891\u8d28\u91cf\u4e0b\u7801\u7387\u6709 58% \u7684\u8282\u7701\uff0c\u56e0\u4e3a\u89c6\u9891\u5185\u5bb9\u8d8a\u9759\u6b62\u4e0d\u52a8\uff0c\u5e27\u95f4\u7f16\u7801\u7684\u6bd4\u4f8b\u8d8a\u9ad8\uff0c\u5219 RCC \u7684\u4f18\u52bf\u8d8a\u660e\u663e\uff0c\u6240\u4ee5\u89c6\u9891\u4f1a\u8bae\u5e8f\u5217 RCC \u7684\u589e\u76ca\u6bd4\u8fd0\u52a8\u5e8f\u5217\u8981\u9ad8\uff0c\u662f\u5408\u7406\u7684\u3002<\/p>\n

\u4e0b\u56fe\u5c55\u793a\u4e86\u4e00\u4e2a\u6d4b\u8bd5\u5e8f\u5217\u4f7f\u7528 RCC \u540e\u7801\u7387\u6ce2\u52a8\u7684\u53d8\u5316\uff0c\u84dd\u7ebf\u8868\u793a\u7684\u662f\u672a\u52a0 RCC \u7684\u7801\u7387\u6ce2\u52a8\uff0c\u7ea2\u7ebf\u8868\u793a\u7684\u662f\u52a0\u4e86 RCC \u4e4b\u540e\u7684\u7801\u7387\u6ce2\u52a8\uff0c\u53ef\u4ee5\u770b\u5230\u4f7f\u7528 RCC \u540e\u5206\u8fa8\u7387\u5207\u6362\u5904\u7684\u7f16\u7801 I \u5e27\u7801\u7387\u5c16\u5cf0\u660e\u663e\u6ca1\u6709\u4e86\uff0c\u7801\u7387\u66f4\u52a0\u5e73\u7a33\uff0c\u800c\u4e14\u89c6\u9891\u8d28\u91cf PSNR \u4e5f\u6709\u6240\u63d0\u5347\u3002<\/p>\n

\"\u963f\u91cc\u4e91<\/p>\n

\u84dd\u7ebf\u4e2d\u5206\u8fa8\u7387\u5207\u6362\u5904\u7684 I \u5e27\u5e73\u5747\u7801\u7387\u4e3a 840kbps, PSNR=33.5db, 39.7db, 40.6db for Y, U, V \u4e09\u4e2a\u5206\u91cf\uff1b\u800c\u7ea2\u7ebf\u4e2d\u5206\u8fa8\u7387\u5207\u6362\u5e27\u7684\u5e73\u5747\u7801\u7387\u4e3a 360kbps, PSNR=36.3db, 40.9db, 42.0db for Y, U, V \u4e09\u4e2a\u5206\u91cf\u3002<\/p>\n

\u5373\u5f00\u4e86 RCC \u4e4b\u540e\uff0c\u5206\u8fa8\u7387\u5207\u6362\u65f6\u7684 I \u5e27\u7801\u7387\u964d\u4f4e\u4e86\u8fd1 60%\uff0c\u540c\u65f6\u4eae\u5ea6\u7684 PSNR \u63d0\u5347\u4e86\u8fd1 3 \u4e2a db \u3002<\/p>\n

RTC level \u6548\u679c<\/h2>\n

\u9664\u4e86\u524d\u8ff0\u7684\u5355\u7eaf codec level \u53d8\u5206\u8fa8\u7387\u4e0d\u7f16 I \u5e27\u5e26\u6765\u7684\u4e00\u5e27\u7684\u538b\u7f29\u6027\u80fd\u63d0\u5347\u4e4b\u5916\uff0cRCC \u5728\u548c LTR (Long Term Reference) \u7ed3\u5408\u540e\u4f1a\u8fdb\u4e00\u6b65\u964d\u4f4e\u5f31\u7f51\u4e0b\u9891\u7e41\u8bf7\u6c42 I \u5e27\u7684\u53ef\u80fd\u6027\u3002<\/p>\n

LTR \u6297\u5f31\u7f51\u7684\u539f\u7406\u5728\u4e0a\u4e00\u7bc7\u5206\u4eab\u300a\u963f\u91cc\u4e91 RTC QoS \u5c4f\u5e55\u5171\u4eab\u5f31\u7f51\u4f18\u5316\u4e4b\u82e5\u5e72\u7f16\u7801\u5668\u76f8\u5173\u4f18\u5316\u300b\u4e2d\u5df2\u6709\u6240\u4ecb\u7ecd\uff0c\u5728\u6b64\u7ed3\u5408 RCC \u4f1a\u8fdb\u4e00\u6b65\u63d0\u5347\u5176\u6297\u5f31\u7f51\u6548\u679c\uff0c\u539f\u7406\u5982\u4e0b\uff1a<\/p>\n

    \n
  1. \u6ca1\u6709 LTR \u65f6\uff0c\u5728\u5f31\u7f51\u573a\u666f\u4e0b\u5982\u679c\u4e22\u5305\u6216\u5361\u987f\u65e0\u6cd5\u6062\u590d\uff0c\u5219\u4f1a\u8bf7\u6c42 I \u5e27\uff1b<\/li>\n
  2. \u589e\u52a0\u4e86 LTR \u4e4b\u540e\uff0c\u5219\u4e0d\u4f1a\u8bf7\u6c42 I \u5e27\uff0c\u800c\u662f\u4f1a\u8bf7\u6c42 LTR \u5e27\u6062\u590d\uff0c\u7f16\u7801\u6548\u7387\u63d0\u5347\u5f88\u591a\uff1b<\/li>\n
  3. \u5982\u679c\u662f\u5f31\u7f51\u4e0b\u53d1\u751f\u4e86\u5206\u8fa8\u7387\u5207\u6362\uff0c\u6ca1\u6709 RCC \u7684\u60c5\u51b5\u4e0b\uff0c\u7531\u4e8e\u5fc5\u987b\u7f16\u7801 IDR \u5e27\uff0c\u6240\u4ee5 LTR \u88ab\u6e05\u7a7a\uff0c\u5982\u679c\u6b64 I \u5e27\u592a\u5927\uff0c\u5bfc\u81f4\u63a5\u6536\u7aef\u6536\u4e0d\u5230\uff0c\u5219\u5176\u4f1a\u518d\u6b21\u8bf7\u6c42 I \u5e27\uff0c\u9677\u5165\u4e00\u4e2a\u6076\u6027\u5faa\u73af\u4e2d\u3002<\/li>\n
  4. \u5982\u679c\u5f00\u4e86 RCC\uff0c\u4e0d\u4ec5\u5206\u8fa8\u7387\u5207\u6362\u5e27\u672c\u5e27\u4e0d\u4f1a\u7f16\u7801 I \u5e27\uff0c\u5176\u4ed6\u7684\u53c2\u8003\u5e27\u7ba1\u7406\u4e5f\u548c\u4e4b\u524d\u4e00\u6837\uff0cLTR \u4e5f\u4e0d\u4f1a\u88ab\u6e05\u7a7a\uff0c\u5206\u8fa8\u7387\u5207\u6362\u5e27\u672c\u5e27\u7684\u5927\u5c0f\u6bd4 I \u5e27\u51cf\u5c11\u4e86\u5f88\u591a\uff0c\u63a5\u6536\u7aef\u6536\u4e0d\u5230\u7684\u6982\u7387\u5927\u5927\u964d\u4f4e\uff0c\u5373\u4f7f\u6536\u4e0d\u5230\uff0c\u4e5f\u53ef\u4ee5\u8bf7\u6c42 LTR \u6062\u590d\uff0c\u800c\u4e0d\u662f I \u5e27\u6062\u590d\u3002<\/li>\n<\/ol>\n

    \u672c\u6587\u5728 RTC level \u6a21\u62df\u5f31\u7f51\u573a\u666f\uff0c\u4f7f\u5176\u4e00\u79d2\u949f\u5207\u6362\u4e00\u6b21\u5206\u8fa8\u7387\uff0c\u4e0b\u9762\u4e24\u56fe\u5206\u522b\u662f\u672a\u52a0 RCC \u548c \u52a0\u4e86 RCC \u4e4b\u540e\u7684\u6548\u679c\uff0c\u53ef\u4ee5\u770b\u5230\u672a\u52a0 RCC \u7684\u753b\u9762\u5728\u5206\u8fa8\u7387\u5207\u6362\u65f6\u4f1a\u6709\u660e\u663e\u7684\u5361\u987f\u4ee5\u53ca\u7f16 I \u5e27\u9020\u6210\u7684 flicker \u6548\u5e94\uff0c\u800c\u52a0\u4e86 RCC \u7684\u5219\u4f1a\u5f88\u6d41\u7545\uff0c\u753b\u9762\u4e5f\u6ca1\u6709 flicker \u6548\u5e94\u3002<\/p>\n

    \"\u963f\u91cc\u4e91<\/p>\n

    \u4e0a\u56fe\u662f\u672a\u52a0 RCC\uff0c\u4e00\u79d2\u949f\u5207\u6362\u4e00\u6b21\u5206\u8fa8\u7387\u7684\u6548\u679c\uff0c\u6709\u591a\u6b21\u660e\u663e\u7684\u5c0f\u5361\u987f\uff0c\u4e14\u753b\u9762\u6709\u9891\u7e41 I \u5e27\u9020\u6210\u7684 flicker \u6548\u5e94\u3002<\/p>\n

    \"\u963f\u91cc\u4e91<\/p>\n

    \u4e0a\u56fe\u662f\u52a0\u4e86 RCC\uff0c\u4e00\u79d2\u949f\u5207\u6362\u4e00\u6b21\u5206\u8fa8\u7387\u7684\u6548\u679c\uff0c\u6574\u4f53\u6bd4\u8f83\u6d41\u7545\uff0c\u611f\u89c9\u4e0d\u5230\u5361\u987f\uff0c\u89c6\u9891\u8d28\u91cf\u4e5f\u6bd4\u8f83\u5e73\u7a33\uff0c\u6ca1\u6709 flicker \u6548\u5e94\u3002<\/p>\n<\/p><\/div>\n

    \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>) <\/div>\n
    <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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