{"id":323,"date":"2022-01-31T17:09:08","date_gmt":"2022-01-31T09:09:08","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=323"},"modified":"2022-06-11T03:18:32","modified_gmt":"2022-06-10T19:18:32","slug":"ffmpeg%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-transcode_step","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=323","title":{"rendered":"ffmpeg\u6e90\u7801\u5206\u6790-transcode_step"},"content":{"rendered":"\n<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1VpUvpLhew-nuq4Dns80mOw\">\u767e\u5ea6\u7f51\u76d8<\/a> \u63d0\u53d6\u7801\uff1ag3k8<\/p>\n\n\n\n<p>ffmpeg \u6e90\u7801\u5206\u6790\u7cfb\u5217\u4ee5\u4e00\u6761\u7b80\u5355\u7684\u547d\u4ee4\u5f00\u59cb\uff0c<code class=\"prettyprint\" >ffmpeg -i a.mp4 b.flv<\/code>\uff0c\u5206\u6790\u5176\u5185\u90e8\u903b\u8f91\u3002<\/p>\n\n\n\n<p>a.mp4\u4e0b\u8f7d\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1RN1xRsQDGx65MGyB_T1IzA\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1anl0s \u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u672c\u6587\u4e3b\u8981\u5206\u6790 <code class=\"prettyprint\" >transcode_step()<\/code> \u7684\u5185\u90e8\u903b\u8f91\uff0c\u6d41\u7a0b\u56fe\u5982\u4e0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"802\" height=\"387\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-7-1.png\" alt=\"\" class=\"wp-image-325\"\/><\/figure>\n\n\n\n<p><code class=\"prettyprint\" >transcode_step()<\/code> \u7684\u4ee3\u7801\u5982\u4e0b\uff0c\u4e3a\u4e86\u7b80\u6d01\uff0c\u6709\u4e9b\u4e0d\u91cd\u8981\u4ee3\u7801\u7f29\u8fdb\u4e86\uff0c\u8fd8\u6709\u4e00\u4e9b\u65e0\u5173\u7684if\uff0c\u4f1a\u5728\u56fe\u4e2d\u6807\u6ce8\uff0c\u91cd\u70b9\u4ee3\u7801\u4f1a\u5df2\u7ecf\u6846\u51fa\u6765\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"965\" height=\"978\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-7-2.png\" alt=\"\" class=\"wp-image-326\"\/><\/figure>\n\n\n\n<p>\u5982\u56fe\u6240\u793a\uff0c<code class=\"prettyprint\" >transcode_step()<\/code> \u4e3b\u8981\u903b\u8f91\u67094\u70b9\u3002<\/p>\n\n\n\n<p>1\uff0c\u8c03\u7528 <code class=\"prettyprint\" >choose_output()<\/code> \u5728\u6240\u6709\u8f93\u51fa\u6d41\u4e2d\u9009\u51fa\u6700\u5408\u9002\u7684\u90a3\u4e2a <code>OutputStream<\/code>\uff0c<code>choose_output()<\/code> \u7684\u5185\u90e8\u5b9e\u73b0\u662f\u4f18\u9009\u9009\u62e9 \u6ca1\u6709\u521d\u59cb\u5316\u7684 <code>OutputStream<\/code>\uff0c\u5982\u679c <code>OutputStream<\/code> \u90fd\u521d\u59cb\u5316\u4e86\uff0c\u5c31\u9009\u5f53\u524d stream \u65f6\u957f\u6700\u77ed\u7684\u8fd4\u56de\uff0c\u6700\u77ed\u65f6\u95f4\u901a\u8fc7 <code>ost-&gt;st-&gt;cur_dts<\/code> \u6765\u5224\u65ad\uff0c<code>choose_output()<\/code> \u6bd4\u8f83\u7b80\u5355\uff0c\u81ea\u884c\u9605\u8bfb\u4ee3\u7801\u53ef\u7406\u89e3\u3002<\/p>\n\n\n\n<p>2\uff0c\u6839\u636e\u5df2\u7ecf\u9009\u62e9\u7684 <code class=\"prettyprint\" >OutputStream<\/code> \u6765\u786e\u5b9a <code>InputStream<\/code>\uff0c\u786e\u5b9a <code>InputStream<\/code> \u8fd9\u4e2a\u903b\u8f91\u6bd4\u8f83\u7ed5\uff0c\u9700\u8981\u91cd\u70b9\u8bb2\u4e00\u4e0b\u3002\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u4e00\u5171\u67093\u4e2a if \u6761\u4ef6\u6765\u8bbe\u7f6e <code>ist<\/code>\u3002\u8fd9\u91cc\u6211\u76f4\u63a5\u6307\u660e\u4e00\u4e0b\uff0c\u7b2c\u4e00\u7b2c\u4e8c\u4e2a<code>if<\/code> \u4f1a\u8dd1\u8fdb\u53bb\uff0c\u7b2c\u4e09\u4e2a<code>if<\/code>\u5728\u5f53\u524d\u547d\u4ee4\u4e0d\u4f1a\u8dd1\u8fdb\u53bb\u3002\u90a3\u7b2c\u4e00\u7b2c\u4e8c\u4e2a<code>if<\/code>\u4ec0\u4e48\u65f6\u5019\u4f1a\u8dd1\u8fdb\u53bb\u5462\uff1f<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u7b2c\u4e00\u4e2a if \u7684\u5224\u65ad\u6761\u4ef6\u662f <code class=\"prettyprint\" >if(ost-&gt;filter &amp;&amp; ost-&gt;filter-&gt;graph-&gt;graph)<\/code> \uff0c\u521a\u5f00\u59cb\u7684\u65f6\u5019 <code>ost-&gt;filter-&gt;graph-&gt;graph<\/code> \u662f\u7a7a\u7684\uff0c\u53ea\u6709\u5728\u89e3\u7801\u5668\u5df2\u7ecf\u89e3\u7801\u51fa\u7b2c\u4e00\u4e2aframe\uff0c\u56e0\u4e3a\u89e3\u7801\u51fa\u4e86 frame \u6240\u4ee5\u8981\u628a frame \u53d1\u9001\u7ed9 <code>buffer filter<\/code>\uff0c\u6240\u4ee5\u5fc5\u987b\u8c03 <code>configure_filtergraph()<\/code> \u521d\u59cb\u5316 graph\uff0c\u8fd9\u65f6\u5019 <code>ost-&gt;filter-&gt;graph-&gt;graph<\/code> \u624d\u6709\u503c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u6709\u89e3\u7801\u5668\u8f93\u51fa\u4e86 frame\uff0c\u7b2c\u4e00\u4e2a<code>if<\/code>\u624d\u80fd\u8dd1\u8fdb\u53bb\u3002\u8dd1\u8fdb\u53bb\u4e4b\u540e\u662f\u8c03\u4e86 <code>transcode_from_filter()<\/code>\u6765\u786e\u5b9a\u8f93\u5165\u6d41\uff0c\u8fd9\u4e2a\u51fd\u6570\u7a0d\u5fae\u6709\u70b9\u590d\u6742\uff0c\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\uff0c<code>transcode_from_filter()<\/code>\u662f\u6839\u636e <code>buffersink filter<\/code>\u6700\u5927\u8bf7\u6c42\u5931\u8d25\u6b21\u6570\u6765\u786e\u5b9a\u8f93\u5165\u6d41\uff0c\u4e0b\u4e00\u6bb5\u518d\u8bb2\u89e3\u3002\u8fd9\u91cc\u63d0\u9192\u4e00\u70b9\uff0c\u89e3\u7801\u5668\u8f93\u51fa\u4e86 frame\uff0c<code>ist-&gt;got_output<\/code> \u4f1a\u7b49\u4e8e1\uff0c\u7b2c\u4e8c\u4e2a<code>if<\/code>\u7528\u4e86\u8fd9\u4e2a\u5224\u65ad\u3002<\/li><li>\u7b2c\u4e8c\u4e2a if \u7684\u5224\u65ad\u6761\u4ef6\u662f <code>if(ost-&gt;filter)<\/code> \uff0c\u8fd9\u4e2a\u6761\u4ef6\u80af\u5b9a\u662f\u6210\u7acb\u7684\uff0c\u4e3b\u8981\u662f\u91cc\u9762\u7684 <code>if<\/code> , <code>if (!ifilter-&gt;ist-&gt;got_output &amp;&amp; !input_files[ifilter-&gt;ist-&gt;file_index]-&gt;eof_reached)<\/code>\uff0c\u6ce8\u610f\uff0c\u8fd9\u91cc\u7528\u4e86 got_output\u3002\u6240\u4ee5\uff0c\u7b2c\u4e8c\u4e2a<code>if<\/code>\u662f\u5728\u89e3\u7801\u5668\u8fd8\u6ca1\u6709\u8f93\u51faframe\u7684\u65f6\u5019\u8dd1\u8fdb\u53bb\u7684\uff0c\u4f18\u5148\u9009\u62e9\u90a3\u4e9b\u89e3\u7801\u5668\u8fd8\u6ca1\u8f93\u51faframe\u7684\u8f93\u5165\u6d41\u3002<\/li><\/ul>\n\n\n\n<p>\u4ece\u4ee3\u7801\u4e0a\u770b\uff0c\u786e\u5b9a\u8f93\u5165\u6d41 <code class=\"prettyprint\" >InputStream<\/code> \u6709\u4e24\u4e2a\u5206\u652f\uff0c\u89e3\u7801\u5668\u6709\u65e0\u5f00\u59cb\u8f93\u51fa <code>AVFrame<\/code>\uff0c\u8f93\u51fa\u4e86\u8dd1\u7b2c\u4e00\u4e2aif\uff0c\u6ca1\u6709\u5f00\u59cb\u8f93\u51fa\u7ee7\u7eed\u8dd1\u7b2c\u4e8c\u4e2aif\u3002<\/p>\n\n\n\n<p>\u4ece\u903b\u8f91\u4e0a\u770b\uff0c\u786e\u5b9a\u8f93\u5165\u6d41 <code class=\"prettyprint\" >InputStream<\/code>\u7684\u903b\u8f91\u662f\uff0c\u4f18\u5148\u9009\u62e9\u89e3\u7801\u5668\u8fd8\u6ca1\u8f93\u51fa<code>frame<\/code>\u7684\u8f93\u5165\u6d41\uff0c\u5982\u679c\u6240\u6709\u89e3\u7801\u5668\u90fd\u5df2\u7ecf\u8f93\u51fa\u8fc7 <code>frame<\/code>\uff0c\u5c31\u8c03\u7528 <code>transcode_from_filter()<\/code>\u6765\u786e\u5b9a\u9009\u62e9\u54ea\u4e2a\u8f93\u5165\u6d41\u6765\u5904\u7406\u3002<\/p>\n\n\n\n<p>3\uff0c\u8c03\u7528 <code class=\"prettyprint\" >process_input()<\/code> \uff0c<code>process_input()<\/code> \u91cc\u9762\u7684\u903b\u8f91\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5c31\u662f\u4ece\u6587\u4ef6\u8bfb\u51fa <code>AVPacket<\/code> \uff0c\u4e22\u7ed9\u89e3\u7801\u5668\u89e3\u7801\uff0c\u5982\u679c\u89e3\u51fa frame\uff0c\u5c31\u628aframe\u4e22\u7ed9 filter \u94fe\u3002\u8fd9\u91cc\u6709\u4e2a\u6ce8\u610f\u70b9\u9700\u8981\u63d0\u53ca\u4e00\u4e0b\uff0c\u867d\u7136\u4ee5\u4e0a\u903b\u8f91\u5df2\u7ecf\u9009\u51fa\u4e86 <code>InputStream<\/code>\uff0c\u5047\u5982<code>InputStream<\/code>\u662fvideo\uff0c\u4f46\u4ece\u6587\u4ef6\u8bfb\u51fa\u6765\u7684 <code>packet<\/code>\u6216\u8bb8\u662faudio\u3002<\/p>\n\n\n\n<p>4\uff0c\u8c03\u7528 <code class=\"prettyprint\" >reap_filter()<\/code> \u4ece <code>buffersink filter<\/code>\u91cc\u9762\u8bfb\u53d6 frame\uff0c\u7136\u540e\u4e22\u7ed9\u7f16\u7801\u5668\uff0c\u7136\u540emux\uff0c\u5199\u8fdb\u53bb\u6587\u4ef6\u3002\u8fd9\u91cc\u53ea\u662f\u7b80\u5355\u4ecb\u7ecd <code>reap_filter()<\/code> \u7684\u4f5c\u7528\uff0c\u540e\u7eed\u4f1a\u8be6\u7ec6\u8bb2\u89e3\u3002reap \u7684\u610f\u601d\u662f\u6536\u5272\u7684\u610f\u601d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u81f3\u6b64\uff0c<code class=\"prettyprint\" >transcode_step()<\/code> \u7684\u5185\u90e8\u903b\u8f91\u5206\u6790\u4e86\u4e00\u5927\u534a\u4e86\u3002\u4e0b\u9762\u753b\u4e2a\u6d41\u7a0b\u56fe\uff0c\u6d41\u7a0b\u56fe\u4f1a\u628a\u4e00\u4e9b\u5173\u8054\u903b\u8f91\u753b\u51fa\u6765\uff0c\u4e0d\u662f\u7b80\u5355\u5730\u628a\u4ee3\u7801\u91cc\u7684 <code>if<\/code> \u7ffb\u8bd1\u6210\u4e2d\u6587\uff0c\u56e0\u4e3a\u90a3\u6837\u4f1a\u8ba9\u521d\u5b66\u8005\u611f\u5230\u5f88\u832b\u7136\uff0c\u672c\u6587\u60f3\u8868\u8fbe\u7684\u662f\uff0cif \u4e2d\u7684\u6761\u4ef6\u5728\u4ec0\u4e48\u6837\u7684\u573a\u666f\u4e0b\u4f1a\u662f true\uff0c\u4ec0\u4e48\u6837\u7684\u573a\u666f\u4e0b\u662ffalse\uff0c\u4fbf\u4e8e\u8bfb\u8005\u7406\u89e3\u6574\u4f53\u903b\u8f91\uff0c\u5982\u679c\u53ea\u662f\u628a <code>if<\/code> \u7ffb\u8bd1\u6210\u4e2d\u6587\uff0c\u4e0d\u5982\u76f4\u63a5\u770b\u4ee3\u7801 \u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"969\" height=\"497\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-7-3.png\" alt=\"\" class=\"wp-image-327\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 <code class=\"prettyprint\" >transcode_step()<\/code> \u7684\u524d\u534a\u90e8\u5206\uff0c\u4e3b\u8981\u529f\u80fd\u5c31\u662f\u786e\u5b9a \u8be5\u9009\u62e9\u54ea\u4e2a<code>ist<\/code> \u8f93\u5165\u6d41\u6765\u5904\u7406\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u63a5\u4e0b\u6765\u4ed4\u7ec6\u5206\u6790\u91cc\u9762\u7684 <code class=\"prettyprint\" >transcode_from_filter()<\/code> \u3002\u5148\u4e0a\u4ee3\u7801\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"973\" height=\"792\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-7-4.png\" alt=\"\" class=\"wp-image-324\"\/><\/figure>\n\n\n\n<p>\u5982\u56fe\u6240\u793a\uff0c <code class=\"prettyprint\" >transcode_from_filter()<\/code> \u6709\u4e24\u4e2a\u5730\u65b9\u9700\u8981\u6ce8\u610f\uff0c<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><code class=\"prettyprint\" >avfilter_graph_request_oldest()<\/code> \u8fd9\u4e2aapi\u51fd\u6570\u7684\u4f5c\u7528\u662f\u83b7\u53d6graph \u91cc\u9762\u6709\u591a\u5c11frame\u53ef\u4ee5\u8bfb\uff0c\u5c31\u662f\u4ece <code>buffersink filter<\/code>\u80fd\u8bfb\u51fa\u591a\u5c11 frame\u3002\u8fd9\u91cc\u7684\u8fd4\u56de\u503c\uff0c\u5728\u5f53\u524d\u547d\u4ee4 <code>ffmpeg -i a.mp4 b.flv<\/code> \u4e0b\uff0c\u5927\u90e8\u5206\u7684\u8fd4\u56de\u503c\u90fd\u662f <code>AVERROR(EAGAIN)<\/code>\uff0c\u5c0f\u4e8e0\u7684\u503c\u3002\u4e3a\u4ec0\u4e48\u8fd9\u91ccret\u5927\u90e8\u5206\u90fd\u5c0f\u4e8e0\uff0c\u662f\u56e0\u4e3a \u4e4b\u524d\u5df2\u7ecf\u6267\u884c\u8fc7\u4e00\u904d <code>reap_filter()<\/code> \u628a filter \u7684 frame \u6536\u5272\u5b8c\u4e86\u3002\u6240\u4ee5\u8fd9\u91cc\u7684 <code>reap_filter()<\/code>\u5927\u90e8\u5206\u60c5\u51b5\u4e0d\u4f1a\u6267\u884c\u3002\u53ea\u6709\u5728\u540e\u9762\u5237 graph \u7684\u672b\u70b9\u6570\u636e\u7684\u65f6\u5019\u624d\u4f1a\u6709\u53ef\u80fd\u8fd4\u56de ret \u5927\u4e8e\u7b49\u4e8e0\u3002\u6240\u4ee5\u4e0d\u7528\u7279\u522b\u5173\u6ce8\u3002<\/li><li>\u7b2c\u4e8c\u4e2a\u6846\u51fa\u7684\u4ee3\u7801\uff0c<code>av_buffersrc_get_nb_failed_requests()<\/code> \u83b7\u53d6 <code>buffer filter<\/code> \u7684\u5931\u8d25\u6b21\u6570\uff0c\u6765\u786e\u5b9a <code>best_ist<\/code>\u3002\u8fd9\u4e2a\u7684\u903b\u8f91\u662f\u8fd9\u6837\u7684\uff0c\u5982\u679c\u4e4b\u524d\u5df2\u7ecf\u8bf7\u6c42\u4e86\u90a3\u4e48\u591a\u6b21\u8fd9\u4e2afilter\u90fd\u6ca1\u8bfb\u51fa\u4e1c\u897f\uff0c\u80af\u5b9a\u5e94\u8be5\u5148\u9009\u62e9\u8fd9\u4e2afilter\u5173\u8054\u7684\u8f93\u5165\u6d41\u6765\u8bfb\u53d6 <code>pakcet<\/code>\uff0c\u7136\u540e\u53d1\u7ed9 filter\uff0c\u8ba9\u4e0b\u6b21 filter\u80fd\u5c3d\u5feb\u8bfb\u51fa\u6570\u636e\u3002\u56e0\u4e3afilter\u5df2\u7ecf\u8bfb\u4e86\u5f88\u591a\u6b21\u90fd\u8bfb\u4e0d\u51fa\u6570\u636e\uff0c\u6240\u4ee5\u5e94\u8be5\u4f18\u9009\u5904\u7406\u8fd9\u4e2a filter \u5173\u8054\u7684 <code>InputStream<\/code>\u3002<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u4e0b\u4e00\u7bc7\u6587\u7ae0\u5206\u6790 <code class=\"prettyprint\" >process_input()<\/code> \u51fd\u6570\u7684\u5185\u90e8\u903b\u8f91<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u00a9\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c 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