{"id":357,"date":"2022-01-31T17:51:50","date_gmt":"2022-01-31T09:51:50","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=357"},"modified":"2022-06-11T03:17:19","modified_gmt":"2022-06-10T19:17:19","slug":"ffmpeg-%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-%e8%bd%ac%e7%a0%81%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=357","title":{"rendered":"ffmpeg \u6e90\u7801\u5206\u6790-\u8f6c\u7801\u603b\u7ed3"},"content":{"rendered":"\n<p>\u5206\u6790\u5230\u8fd9\u91cc\uff0c\u662f\u65f6\u5019\u753b\u4e00\u4e2a <code class=\"prettyprint\" >transcode()<\/code> \u7684\u6574\u4f53\u6d41\u7a0b\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"4128\" height=\"1529\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-12-1.png\" alt=\"\" class=\"wp-image-359\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u8f6c\u7801\u7684\u6d41\u7a0b\u5df2\u7ecf\u5206\u6790\u5b8c\u6bd5\u4e86\uff0c\u63a5\u4e0b\u6765\u4e3b\u8981\u8bb2\u89e3 EOF \u7684\u5904\u7406\u8ddf\u8f6c\u7801\u7ed3\u675f\u5404\u79cd\u72b6\u6001\u7684\u53d8\u5316\u3002<\/p>\n\n\n\n<p>EOF \u5206\u4e3a\u4ee55\u79cd\u573a\u666f\u3002<\/p>\n\n\n\n<p>1\uff0c<code class=\"prettyprint\" >av_read_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code>\uff0c\u8fd9\u4e2a\u65f6\u5019\u4ee3\u8868\u8f93\u5165\u6587\u4ef6\u5df2\u7ecf\u6ca1\u6709packet\u53ef\u4ee5\u8bfb\u53d6\u3002\u5c31\u4f1a\u5bfc\u81f4 \u6267\u884c <code>process_input_packet(ist, NULL, 0)<\/code> ,\u53ef\u4ee5\u770b\u5230\uff0c\u4f20\u9012\u8fdb\u53bb <code>process_input_packet()<\/code> \u7684 <code>pkt<\/code> \u662f <code>NULL<\/code>\u3002 <code>process_input_packet()<\/code> \u7684 <code>pkt<\/code> \u662f <code>NULL<\/code> \u5c31\u4f1a\u5bfc\u81f4 \u4f20\u9012\u7ed9 <code>decode_video()<\/code> \u7684 <code>avpkt.size == 0<\/code> \uff0c\u5c31\u4f1a\u518d\u5bfc\u81f4 \u4f20\u9012 \u7ed9 <code>avcodec_send_packet()<\/code> \u7684 pkt \u7684 size \u4e5f\u662f0\u3002\u53ef\u4ee5\u770b\u5230\u4e00\u884c\u82f1\u6587\u6ce8\u91ca \uff0c<code>pkt-&gt;size==0 is a flush\/drain packet<\/code>\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u5c31\u662f <code class=\"prettyprint\" >av_read_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \u4e4b\u540e\u5bfc\u81f4\u6574\u4e2a\u94fe\u8def\u7684\u53cd\u5e94\u3002<\/p>\n\n\n\n<p>2\uff0c<code class=\"prettyprint\" >avcodec_send_packet()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code>\uff0c\u8fd9\u4e2a\u4ec0\u4e48\u60c5\u51b5\u4f1a\u8fd4\u56de <code>AVERROR_EOF<\/code>\uff0c\u5c31\u662f\u7b2c\u4e8c\u6b21\u4f20\u9012 <code>pkt-&gt;size==0<\/code> \u5c31\u4f1a\u8fd4\u56de AVERROR_EOF\uff0c\u4f46\u662f\u8fd9\u4e2aEOF\u4e0d\u7528\u5173\u6ce8\uff0c\u5728ffmpeg \u91cc\u9762\u662f\u76f4\u63a5\u8df3\u8fc7\u7684\uff0c\u8bf7\u770b\u4ee3\u7801\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"627\" height=\"150\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-12-2.png\" alt=\"\" class=\"wp-image-360\"\/><\/figure>\n\n\n\n<p>3\uff0c<code class=\"prettyprint\" >avcodec_receive_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code>\uff0c\u8fd9\u91cc\u8fd4\u56de EOF\uff0c\u8bf4\u660e\u4e4b\u524d\u5df2\u7ecf\u4f20\u9012\u8fc7 size==0 \u7684 pkt \u7ed9<code>avcodec_send_packet()<\/code>\u3002<code>avcodec_receive_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \u4ee3\u8868 \u89e3\u7801\u5668\u5df2\u7ecf\u6ca1\u6709 frame \u53ef\u4ee5\u8f93\u51fa\u4e86\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >avcodec_receive_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \u4f1a\u5bfc\u81f4 <code>decode()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \uff0c\u518d\u5bfc\u81f4 decode_video() \u8fd4\u56de <code>AVERROR_EOF<\/code> \u3002\u4e5f\u5c31\u4f1a\u5bfc\u81f4\u8c03\u7528 <code>decode_video()<\/code> \u7684 <code>process_input_packet()<\/code> \u7684 <code>eof_reached<\/code> = 1 \uff0c\u5bfc\u81f4 <code>send_filter_eof()<\/code> \u6267\u884c\u5237filter\u94fe\uff0c\u5bfc\u81f4 process_input_packet() \u8fd4\u56de <code>!eof_reached<\/code> \u4e5f\u5c31\u662f\u8fd4\u56de 0 \u3002\u6700\u540e\u4f1a\u5bfc\u81f4 <code>process_input_packet(ist, NULL, 0)<\/code> \u8fd4\u56de 0 \uff0c\u6ce8\u610f\u8fd9\u91cc <code>process_input_packet<\/code> \u5df2\u7ecf\u5f00\u59cb\u4f20 NULL \u4e86\u3002\u63a5\u4e0b\u6765\u5c31\u4f1a\u5bfc\u81f4 <code>ifile-&gt;eof_reached = 1<\/code>\u3002\u518d\u5bfc\u81f4 <code>process_input()<\/code> \u8fd4\u56de <code>AVERROR(EAGAIN)<\/code>\u3002\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4 <code>transcode_step()<\/code> \u4e0d\u6267\u884c <code>reap_filters()<\/code> \uff0c\u76f4\u63a5\u8fd4\u56de 0\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u94fe\u8def\u592a\u957f\uff0c\u753b\u4e2a\u6d41\u7a0b\u56fe\u4fbf\u4e8e\u7406\u89e3<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"5156\" height=\"786\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-12-3.png\" alt=\"\" class=\"wp-image-361\"\/><\/figure>\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-alpha-channel-opacity\"\/>\n\n\n\n<p>4\uff0c<code class=\"prettyprint\" >reap_filters()<\/code> \u91cc\u9762\u7684 EOF\uff0c<code>reap_filter()<\/code> \u7684EOF \u5176\u5b9e\u5c31\u662f <code>av_buffersink_get_frame_flags()<\/code>\uff0c\u8fd9\u4e2aEOF \u5176\u5b9e\u4e0d\u7528\u7279\u522b\u5173\u6ce8\uff0c\u56e0\u4e3a\u4ed6\u4e0d\u4f1a\u5bfc\u81f4<\/p>\n\n\n\n<p><code class=\"prettyprint\" >ost-&gt;finished<\/code> \u7684\u72b6\u6001\u53d8\u66f4\u3002\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c <code>av_buffersink_get_frame_flags()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \u5e76\u4e0d\u4f1a\u5bfc\u81f4 \u4f20\u9012 NULL pkt \u7ed9 <code>avcodec_send_frame()<\/code>\u3002\u4f20\u9012 NULL pkt \u5237\u65b0\u7f16\u7801\u5668\uff0c\u662f <code>flush_encoders()<\/code> \u8fd9\u4e2a\u51fd\u6570\u505a\u7684\u3002<\/p>\n\n\n\n<p>5\uff0c<code class=\"prettyprint\" >transcode_from_filter()<\/code> \u91cc\u9762\u7684 EOF\uff0c\u4e5f\u5c31\u662f <code>avfilter_graph_request_oldest()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code>\uff0c\u4f1a\u5bfc\u81f4 <code>close_output_stream()<\/code> \u6267\u884c\uff0c\u7136\u540e\u5bfc\u81f4 <code>ost-&gt;finished |= ENCODER_FINISHED<\/code>\uff0c\u6700\u540e\u5bfc\u81f4 <code>need_output()<\/code> \u7684\u65f6\u5019\u9000\u51fa\u8f6c\u7801\u6d41\u7a0b\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1a<code class=\"prettyprint\" >avfilter_graph_request_oldest()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code>\u662f\u56e0\u4e3a\u4e4b\u524d<code>avcodec_receive_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \uff0c\u5bfc\u81f4\u8c03\u7528\u4e86 <code>send_filter_eof()<\/code> \u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1549\" height=\"439\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-12-4.png\" alt=\"\" class=\"wp-image-362\"\/><\/figure>\n\n\n\n<p>6\uff0c\u6700\u540e\u662f <code class=\"prettyprint\" >flush_encoders()<\/code> \u7684\u8c03\u7528\uff0c<code>flush_encoders()<\/code> \u4f1a\u8c03\u7528 <code>avcodec_send_frame(enc, NULL)<\/code> \uff0c\u901a\u8fc7\u4f20\u9012 NULL \u628a\u7f16\u7801\u5668\u5269\u4e0b\u7684packet\u5168\u90e8\u5237\u51fa\u6765\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"704\" height=\"224\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-12-5.png\" alt=\"\" class=\"wp-image-358\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 <code class=\"prettyprint\" >ost-&gt;finished<\/code> \u6709\u4e24\u4e2a\u72b6\u6001<code>ENCODER_FINISHED<\/code> \u8ddf <code>MUXER_FINISHED<\/code> \u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code class=\"prettyprint\" >ENCODER_FINISHED<\/code> \u662f\u5728 \u8bfb\u53d6 buffersink \u8fd4\u56de EOF \u7684\u65f6\u5019\u8bbe\u7f6e\u7684\u3002<\/li><li><code>MUXER_FINISHED<\/code> \u5728\u672c\u6587\u547d\u4ee4\u91cc\u5e76\u6ca1\u6709\u8bbe\u7f6e\uff0c\u4e5f\u80fd\u6b63\u5e38\u9000\u51fa\uff0c\u6709\u70b9\u5947\u602a\u3002<\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u6700\u540e\u5728\u7cbe\u7b80\u4e00\u4e2a\u91cd\u70b9\uff0c<code class=\"prettyprint\" >ost-&gt;finished<\/code> \u8bbe\u7f6e\u4e3a <code>ENCODER_FINISHED<\/code> \u662f\u5728 \u89e3\u7801\u5668\u8fd4\u56de EOF\uff0c\u540e\u7eed\u6ca1\u6709frame\u8f93\u5165\u4e86\uff0c\u4e5f\u5c31\u662f <code>avcodec_receive_frame()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code> \u7684\u573a\u666f\u4e0b\u8bbe\u7f6e\u7684\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u6ca1\u6709 frame \u8f93\u5165\u4e86\uff0c\u5c31\u4f1a\u8c03\u7528<code class=\"prettyprint\" >send_filter_eof()<\/code>\u91cc\u9762\u7684 <code>av_buffersrc_close()<\/code> \u7ed9filter\u94fe\u8f93\u5165\u4e00\u4e2aNULL\uff0c\u6b64\u65f6 filter\u94fe\u53ef\u80fd\u8fd8\u6709 frame \u7f13\u5b58\uff0c\u6240\u4ee5\u5fc5\u987b\u7b49 <code>avfilter_graph_request_oldest()<\/code> \u8fd4\u56de <code>AVERROR_EOF<\/code>\uff0c\u624d\u80fd\u8bf4\u660e filter \u94fe\u5df2\u7ecf\u6ca1\u6709 frame\u4e86\uff0c\u624d\u80fd\u8c03 <code>close_output_stream()<\/code> \u628a <code>ost-&gt;finished<\/code> \u8bbe\u7f6e\u4e3a <code>ENCODER_FINISHED<\/code> \u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u6b64\u65f6\uff0c\u7f16\u7801\u5668\u8fd8\u6ca1\u6709\u53d1\u9001NULL\u5305\u53bb\u5237\uff0c\u6240\u4ee5\u540e\u9762\u8fd8\u4f1a\u6267\u884c <code class=\"prettyprint\" >flush_encoder()<\/code> \u53bb\u53d1\u9001NULL \u53bb\u5237\u7f16\u7801\u5668<\/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 \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5206\u6790\u5230\u8fd9\u91cc\uff0c\u662f\u65f6\u5019\u753b\u4e00\u4e2a transcode() \u7684\u6574\u4f53\u6d41\u7a0b\u56fe\u3002 \u8f6c\u7801\u7684\u6d41\u7a0b\u5df2\u7ecf\u5206\u6790\u5b8c\u6bd5\u4e86\uff0c\u63a5\u4e0b\u6765\u4e3b\u8981\u8bb2\u89e3 E [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,15],"tags":[],"class_list":["post-357","post","type-post","status-publish","format-standard","hentry","category-ffmpeg","category-ffmpeg-transcode"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ffmpeg \u6e90\u7801\u5206\u6790-\u8f6c\u7801\u603b\u7ed3 - \u5f26\u5916\u4e4b\u97f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xianwaizhiyin.net\/?p=357\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ffmpeg \u6e90\u7801\u5206\u6790-\u8f6c\u7801\u603b\u7ed3 - \u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"og:description\" content=\"\u5206\u6790\u5230\u8fd9\u91cc\uff0c\u662f\u65f6\u5019\u753b\u4e00\u4e2a transcode() \u7684\u6574\u4f53\u6d41\u7a0b\u56fe\u3002 \u8f6c\u7801\u7684\u6d41\u7a0b\u5df2\u7ecf\u5206\u6790\u5b8c\u6bd5\u4e86\uff0c\u63a5\u4e0b\u6765\u4e3b\u8981\u8bb2\u89e3 E [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.xianwaizhiyin.net\/?p=357\" \/>\n<meta property=\"og:site_name\" content=\"\u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-31T09:51:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-10T19:17:19+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/.\/wp-content\/uploads\/2022\/01\/ffmpeg_c-12-1.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"loken\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.xianwaizhiyin.net\/#website\",\"url\":\"https:\/\/www.xianwaizhiyin.net\/\",\"name\":\"\u5f26\u5916\u4e4b\u97f3\",\"description\":\"FFmpeg\u3001WebRTC\uff0cSRS \u97f3\u89c6\u9891\u3001\u6d41\u5a92\u4f53\u6280\u672f\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.xianwaizhiyin.net\/?s={search_term_string}\"},\"query-input\":\"required 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