{"id":355,"date":"2022-01-31T17:47:21","date_gmt":"2022-01-31T09:47:21","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=355"},"modified":"2022-06-11T03:17:39","modified_gmt":"2022-06-10T19:17:39","slug":"ffmpeg%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-reap_filter","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=355","title":{"rendered":"ffmpeg\u6e90\u7801\u5206\u6790-reap_filter"},"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\" >reap_filter()<\/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=\"969\" height=\"497\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-1.png\" alt=\"\" class=\"wp-image-350\"\/><\/figure>\n\n\n\n<p>\u5728\u6b64\u8d34\u4e0a reap_filter() \u7684\u4ee3\u7801\u56fe\u3002\u7ea2\u7b14\u91cd\u70b9\uff0c\u7eff\u7b14\u4e0d\u4f1a\u6267\u884c\u6216\u8005\u4e0d\u91cd\u8981\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"981\" height=\"1515\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-2.png\" alt=\"\" class=\"wp-image-351\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"616\" height=\"476\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-3.png\" alt=\"\" class=\"wp-image-352\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >reap_filters()<\/code> \u7684\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\u3002\u5148 <code>init_output_stream()<\/code> \u521d\u59cb\u5316 \u8f93\u51fa\u6d41\uff0c\u7136\u540e\u4e0d\u65ad\u5faa\u73af\uff0c\u8c03\u7528 <code>av_buffersink_get_frame_flags()<\/code>\u4e0d\u65ad\u4ece <code>buffersink<\/code> \u90a3\u91cc\u8bfb\u53d6 \u7ecf\u8fc7 filter \u8f6c\u6362\u540e\u7684 frame\uff0c\u77e5\u9053\u8bfb\u4e0d\u5230\u5c31\u4f1a\u8df3\u51fa while\u3002\u968f\u540e\u5c31\u662f <code>do_video_out()<\/code> \u8ddf <code>do_audio_out()<\/code> \u7684\u8c03\u7528\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p><code class=\"prettyprint\" >do_video_out()<\/code> \u7684\u903b\u8f91\u5176\u5b9e\u662f\u6bd4\u8f83\u590d\u6742\u7684\uff0c\u91cc\u9762\u8c8c\u4f3c\u5b9e\u73b0\u4e86\u4e00\u4e2a\u5e27\u7387\u8f6c\u6362\u7b97\u6cd5\u4e4b\u7c7b\u7684\u4e1c\u897f\u3002\u4f46\u662f\u5982\u56fe\uff0c\u7eff\u8272\u6846\u51fa\u6765\u7684duration\uff0c\u5e94\u8be5\u662f\u6839\u636e\u4e0d\u7528\u573a\u666f\u8ba1\u7b97duration\uff0c\u4e0d\u7528\u7279\u522b\u5173\u6ce8\uff0c\u8fd8\u6709<code>delta0<\/code>\uff0c<code>delta<\/code>\uff0c<code>nb0_frames<\/code>\uff0c<code>nb_frames<\/code>\uff0c<code>ost-&gt;last_nb0_frames<\/code>\uff0c\u8fd9\u4e9b\u53d8\u91cf\u7684\u8d4b\u503c\u8ddf\u8ba1\u7b97\uff0c\u4f1a\u641e\u5f97\u4f60\u5934\u6655\u76ee\u7729\u3002\u4e0d\u5229\u4e8e\u521d\u5b66\u8005\u7406\u89e3\u3002 \u6240\u4ee5\u8fd9\u91cc\u6211\u76f4\u63a5\u6307\u540d\uff0c\u8fd9\u4e9b\u53d8\u91cf\u90fd\u4e0d\u7528\u7279\u522b\u5173\u6ce8\uff0c\u770b\u4e00\u904d\u5c31\u884c\u4e86\uff0c\u770b\u4e0d\u61c2\u4e5f\u6ca1\u4e8b\uff0c\u8fd9\u4e9b\u7b97\u6cd5\u5e94\u8be5\u9700\u8981\u7ed3\u5408\u4e00\u4e2a\u5177\u4f53\u7684\u5e27\u7387\u53d8\u6362\u547d\u4ee4\u624d\u80fd\u66f4\u597d\u7684\u89e3\u91ca\u3002 \u53ea\u9700\u8981\u5173\u6ce8 <code>nb_frames<\/code> \uff0c\u56e0\u4e3a\u4ed6\u5728\u540e\u9762\u7684for\u5faa\u73af\u91cc\u9762\u7528\u4e86\uff0c\u800c\u4e14<code>nb_frames<\/code> \u5728\u672c\u547d\u4ee4\u4e0b\u7ecf\u5e38\u662f1\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >do_video_out()<\/code> \u91cc\u9762\u8fd8\u6709\u4e2a\u5f3a\u5236 I \u5e27\u7b97\u6cd5\uff0c\u4e5f\u4e0d\u7528\u7279\u522b\u5173\u6ce8\uff0c\u672c\u547d\u4ee4\u6ca1\u7528\u5230\u3002\u56e0\u4e3a\u4ee3\u7801\u91cf\u592a\u5927\uff0c\u8fd9\u91cc\u53ea\u622a\u56fe\u4e86\u5f88\u5173\u952e\u7684\u6bb5\u843d\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1064\" height=\"817\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-4.png\" alt=\"\" class=\"wp-image-353\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"530\" height=\"594\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-5.png\" alt=\"\" class=\"wp-image-354\"\/><\/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-css-opacity\"\/>\n\n\n\n<p>\u91cd\u70b9\u5df2\u7ecf\u7528\u6d41\u7a0b\u56fe\uff0c\u753b\u7b14\u753b\u51fa\u6765\u4e86\u3002\u53ef\u4ee5\u770b\u5230 do_video_out() \u5f80\u7f16\u7801\u5668\u53d1\u4e00\u4e2a frame \u5c31\u4f1a\u4e0d\u65ad\u5730\u8bfb\u53d6packet\uff0c\u76f4\u5230\u8bfb\u4e0d\u5230packet\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c <code class=\"prettyprint\" >buffersink<\/code> \u6ca1\u6709frame \u51fa\u6765\u4e86\uff0c\u7f16\u7801\u5668\u4e5f\u5c31\u4e0d\u4f1a\u518d\u6709packet\uff0c\u7f13\u5b58\u4e2d\u7684 packet \u90fd\u4e0d\u4f1a\u6709\uff0c\u56e0\u4e3a\u4e0a\u6b21\u5df2\u7ecf\u5faa\u73af\u8bfb\u5b8c\u4e86\u6240\u6709 pakcet\uff0c\u8fd9\u4e2a\u6bd4\u8f83\u91cd\u8981\u3002\u6240\u4ee5\u4e0d\u9700\u8981\u5904\u7406 <code>avcodec_receive_packet()<\/code> \u7684EOF\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u8fd8\u6709\u4e00\u4e2a <code class=\"prettyprint\" >output_packet()<\/code> \u6ca1\u6709\u5206\u6790\u3002\u672c\u547d\u4ee4\u6ca1\u6709\u7528 bitstream_filters \uff0c\u6240\u4ee5 <code>output_packet()<\/code> \u5b9e\u9645\u4e0a\u662f\u76f4\u63a5\u8c03\u7528\u4e86 write_packet()\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1059\" height=\"945\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-6.png\" alt=\"\" class=\"wp-image-348\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"944\" height=\"338\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-7.png\" alt=\"\" class=\"wp-image-349\"\/><\/figure>\n\n\n\n<p>write_packet() \u7684\u6d41\u7a0b\u6bd4\u8f83\u7b80\u5355\u3002\u4e3b\u8981\u7684\u4e00\u70b9\u662f\u5199\u7f13\u5b58 <code class=\"prettyprint\" >muxing_queue<\/code>\uff0c\u8fd9\u91cc\u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u60c5\u51b5\u4f1a\u5199\u7f13\u5b58\u3002<\/p>\n\n\n\n<p>\u8f93\u51fa\u6587\u4ef6\u7684\u6240\u6709\u6d41\uff0c\u5305\u62ec\u97f3\u9891\uff0c\u89c6\u9891\u6d41\uff0c\u5168\u90e8\u521d\u59cb\u5316\u5b8c\u6210\u5c31\u4f1a\u8c03\u7528 <code class=\"prettyprint\" >avformat_write_header()<\/code>,\u7136\u540e\u8bbe\u7f6e <code>of-&gt;header_written<\/code> \u4e3a 1 \u3002<\/p>\n\n\n\n<p>of-&gt;header_written \u7b49\u4e8e 0 \u5c31\u4ee3\u8868\u6709\u8f93\u51fa\u6d41\u6ca1\u6709\u521d\u59cb\u5316\uff0c<code class=\"prettyprint\" >init_output_stream()<\/code>\u51fd\u6570\u6ca1\u6709\u8c03\u7528\u3002\u4ec0\u4e48\u60c5\u51b5\u4f1a\u6ca1\u6709\u8c03\u7528\u5462\uff1f<\/p>\n\n\n\n<p>\u89c6\u9891\u8fd8\u6ca1\u89e3\u7801\u51fa\u4efb\u4f55\u4e00\u5e27\uff0c\u5bfc\u81f4 <code class=\"prettyprint\" >ifilter_send_frame()<\/code> \u6ca1\u6709\u6267\u884c\uff0c\u4e4b\u524d\u8bf4\u8fc7 <code>ifilter_send_frame()<\/code> \u91cc\u9762\u4f1a\u8c03\u7528 <code>configure_filtergraph()<\/code>\uff0c<code>configure_filtergraph()<\/code> \u6ca1\u8c03\u7528\u5c31\u4f1a\u5bfc\u81f4 <code>ost-&gt;filter-&gt;graph-&gt;graph<\/code> \u6ca1\u6709\u521d\u59cb\u5316\u3002 \u7136\u540e\u5728reap_filter()\u51fd\u6570\u5185\u90e8 \u5927\u69821437\u884c\uff0c\u5224\u65ad <code>ost-&gt;filter-&gt;graph-&gt;graph<\/code> \u65f6\u5019\u6267\u884c <code>continue<\/code> \u4e86\uff0c\u5bfc\u81f4\u6ca1\u6709\u6267\u884c <code>init_output_stream<\/code> \uff0c\u6ca1\u6709\u521d\u59cb\u5316\u89c6\u9891\u6d41\uff0c\u6240\u4ee5\u6ca1\u6709\u8c03\u7528 <code>avformat_write_header()<\/code> \u5199\u5165 header\u3002<\/p>\n\n\n\n<p>\u89c6\u9891\u8fd8\u6ca1\u89e3\u7801\u51fa\u4efb\u4f55\u4e00\u5e27\uff0c\u4f46\u662f\u97f3\u9891\u5148\u89e3\u7801\u51fa\u6570\u636e\u4e86\uff0c\u6240\u4ee5\u97f3\u9891 packet \u5c31\u4f1a\u5148\u5199\u8fdb\u53bb \u7f13\u5b58 <code class=\"prettyprint\" >muxing_queue<\/code>\uff0c\u7b49\u89c6\u9891\u51fa\u6570\u636e\u4e86\uff0c\u5199\u5b8c\u5934\u90e8\u4e86\uff0c\u518d\u5199\u5230\u6587\u4ef6\u91cc\u9762\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>do_audio_out() \u76f8\u5bf9\u7b80\u5355\u539f\u7406\u7c7b\u4f3c\uff0c\u8fd9\u91cc\u4e0d\u5206\u6790\u4e86\u3002<\/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","protected":false},"excerpt":{"rendered":"<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8 \u63d0\u53d6\u7801\uff1ag3k8 ffmpeg \u6e90\u7801\u5206\u6790\u7cfb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,15,1],"tags":[],"class_list":["post-355","post","type-post","status-publish","format-standard","hentry","category-ffmpeg","category-ffmpeg-transcode","category-uncategorized"],"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-reap_filter - \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=355\" \/>\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-reap_filter - \u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"og:description\" content=\"\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8 \u63d0\u53d6\u7801\uff1ag3k8 ffmpeg \u6e90\u7801\u5206\u6790\u7cfb [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.xianwaizhiyin.net\/?p=355\" \/>\n<meta property=\"og:site_name\" content=\"\u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-31T09:47:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-10T19:17:39+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/.\/wp-content\/uploads\/2022\/01\/ffmpeg_c-11-1.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\" 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