{"id":346,"date":"2022-01-31T17:44:50","date_gmt":"2022-01-31T09:44:50","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=346"},"modified":"2022-06-11T03:17:56","modified_gmt":"2022-06-10T19:17:56","slug":"ffmpeg%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-decode_video","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=346","title":{"rendered":"ffmpeg\u6e90\u7801\u5206\u6790-decode_video"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\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 class=\"wp-block-paragraph\">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 class=\"wp-block-paragraph\">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 class=\"wp-block-paragraph\">\u672c\u6587\u4e3b\u8981\u5206\u6790 <code class=\"prettyprint\" >decode_video()<\/code> \u8ddf <code>decode_audio()<\/code> \u7684\u5185\u90e8\u903b\u8f91\uff0c\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"824\" height=\"426\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-10-1.png\" alt=\"\" class=\"wp-image-342\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >decode_video()<\/code> \u8fd9\u4e2a\u51fd\u6570\u4e0d\u4ec5\u4ec5\u8981\u6ce8\u610f\u5185\u90e8\u903b\u8f91\u3002\u51fd\u6570\u8fd4\u56de\u503c\uff0c\u51fd\u6570\u4f20\u9012\u7684\u53c2\u6570\u4e5f\u76f8\u5f53\u6709\u8003\u7a76\u3002\u4e0b\u9762\u8d34\u4e00\u4e0b <code>decode_video()<\/code> \u7684\u5f62\u53c2\u4e0e\u5b9e\u53c2\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\u5f62\u53c2\uff1adecode_video(InputStream *ist, AVPacket *pkt, int *got_output, int64_t *duration_pts, int eof,int *decode_failed)\n\u5b9e\u53c2\uff1adecode_video(ist, repeating ? NULL : &amp;avpkt, &amp;got_output, &amp;duration_pts, !pkt, &amp;decode_failed)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd4\u56de\u503c\u5206\u6790\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >decode_video()<\/code> \u6700\u540e\u4e00\u884c\u4ee3\u7801 \u662f <code>return err &lt; 0 ? err : ret;<\/code> err \u662f <code>send_frame_to_filters()<\/code> \u7684\u9519\u8bef\uff0cret \u662f\u89e3\u7801\u8fd4\u56de\u7684\u9519\u8bef\u3002\u8dd1\u5230\u6700\u540e\u4e00\u884c\uff0cret\u80af\u5b9a\u662f 0\u3002<code>decode_video()<\/code> \u7684\u8fd4\u56de\u503c\u662f 0 \u8ddf \u975e0 \u503c\uff0c0\u4ee3\u8868\u6ca1\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u53c2\u6570\u5206\u6790\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><code class=\"prettyprint\" >decode_video()<\/code> \u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f <code>AVPacket *pkt<\/code>\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5176\u5b9e\u67093\u79cd\u573a\u666f\u4f20\u503c\u3002<ul><li>repeating \u7b49\u4e8e1\uff0c\u4f20NULL\uff0c\u4f20NULL\u4e3b\u8981\u63a7\u5236 <code>decode()<\/code> \u51fd\u6570\u5185\u90e8 \u4e0d\u8c03\u7528<code>avcodec_send_packet()<\/code>\uff0c \u53ea\u8c03\u7528<code>avcodec_receive_frame()<\/code> \u6765\u5237\u89e3\u7801\u5668frame\u3002<\/li><li>\u76f4\u63a5\u4f20 <code>avpkt<\/code> \u53d8\u91cf\uff0c<code>avpkt<\/code> \u5b9e\u9645\u4e0a\u4e5f\u6709\u4e24\u79cd\u60c5\u51b5\uff0c<code>avpkt.size<\/code> \u7b49\u4e8e0 \u6216\u8005\u4e0d\u7b49\u4e8e 0\u3002<code>avpkt.size == 0<\/code> \u4ee3\u8868\u540e\u7eed\u5df2\u7ecf\u6ca1\u6709 \u6b63\u5e38<code>pakcet<\/code> \u6570\u636e\u7ed9\u89e3\u7801\u5668\uff0c\u662f flush \u89e3\u7801\u5668\u3002<code>avpkt.size != 0<\/code> \u4ee3\u8868\u6b63\u5e38 <code>pakcet<\/code> \u53d1\u9001\u7ed9\u89e3\u7801\u5668\u3002<\/li><\/ul><\/li><li><code>got_output<\/code> \u4ee3\u8868\u89e3\u7801\u5668\u6709\u6ca1\u8f93\u51faframe\u3002\u6709\u65f6\u5019\u8981\u8f93\u5165\u591a\u4e2a <code>pakcet<\/code> \u624d\u80fd\u89e3\u7801\u51fa <code>frame<\/code>\u3002<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u9762\u6700\u91cd\u8981\u7684\u5c31\u662f <code class=\"prettyprint\" >decode_video()<\/code> , <code>decode()<\/code> \u8fd9\u4e24\u4e2a\u51fd\u6570\u7684\u4f20\u53c2\u8ddf\u8fd4\u56de\u503c\uff0c\u5176\u4ed6\u7684\u4ee3\u7801\u90fd\u662f\u4e00\u4e9b\u53c2\u6570\u8d4b\u503c\uff0c\u6570\u636e\u7edf\u8ba1\uff0c\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u4e0b\u9762\u7684\u6d41\u7a0b\u56fe\u4e3b\u8981\u4ee5 <code class=\"prettyprint\" >pkt<\/code> \u4f20\u53c2\uff0c<code>repeating<\/code> \u5206\u652f\u4e3a\u4e3b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1321\" height=\"682\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-10-2.png\" alt=\"\" class=\"wp-image-343\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u6d41\u7a0b\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u5728\u5904\u7406\u6587\u4ef6\u672b\u5c3e\u7684\u65f6\u5019\uff0c <code class=\"prettyprint\" >process_input_packet()<\/code> \u7684\u53c2\u6570 <code>pkt = null<\/code>\uff0c\u4f46\u53ea\u6267\u884c\u4e86\u4e00\u6b21 <code>avcodec_receive_frame()<\/code> \u5c31\u8df3\u51fawhile\u5faa\u73af\uff0c\u6ca1\u6709\u8bbe\u7f6e <code>reapting<\/code> \u7ee7\u7eed\uff0c\u6240\u4ee5\u89e3\u7801\u5668\u53ef\u80fd\u8fd8\u6709frame\u672a\u8bfb\u51fa\u6765\uff0c\u6240\u4ee5\u53ef\u80fd\u4f1a\u8c03\u7528\u591a\u6b21 process_input_packet() \u4f20\u9012 <code>pkt = null<\/code>\uff0c\u76f4\u5230<code>avcodec_receive_frame()<\/code> \u8fd4\u56de EOF\uff0c\u624d\u7b97\u8bfb\u5b8c\u5168\u90e8\u7684 frame\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >decode_video()<\/code> \u7684\u51fd\u6570\u8c03\u7528\u6d41\u7a0b\u56fe\u5982\u4e0b\uff0c\u4e0b\u9762\u5f00\u59cb\u8bb2\u89e3 <code>send_frame_to_filters()<\/code> \u51fd\u6570\u7684\u5185\u90e8\u5b9e\u73b0\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"989\" height=\"583\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-10-3.png\" alt=\"\" class=\"wp-image-344\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >send_frame_to_filters()<\/code> \u91cc\u9762\u7684\u4ee3\u7801\uff0c\u975e\u5e38\u7b80\u5355\u3002\u5c31\u662f\u5f80 <code>InputStream<\/code> \u5173\u8054\u7684\u591a\u4e2a <code>InputFilter<\/code> \u53d1\u9001 <code>frame<\/code>\uff0c\u4f46\u662f\u7531\u4e8e\u672c\u6587\u4f7f\u7528\u7684\u547d\u4ee4 <code>InputStream<\/code> \u6ca1\u6709\u591a\u4e2a filter\uff0c \u6240\u4ee5\u76f8\u5f53\u4e8e\u76f4\u63a5\u6267\u884c <code>ifilter_send_frame()<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >ifilter_send_frame()<\/code> \u7684\u5185\u90e8\u903b\u8f91\u4e5f\u6bd4\u8f83\u7b80\u5355\uff0c\u901a\u8fc7\u5bf9\u6bd4 <code>InputFilter<\/code> \u8ddf <code>AVFrame<\/code> \u7684\u683c\u5f0f\uff0c\u91c7\u6837\u7387\uff0c\u5bbd\u9ad8\u7b49\u53c2\u6570\uff0c\u5224\u65ad\u9700\u4e0d\u9700\u8981\u91cd\u65b0\u521d\u59cb\u5316 <code>filtergraph<\/code>\u3002\u5982\u679c\u9700\u8981\u5c31\u6267\u884c <code>ifilter_parameters_from_frame()<\/code> \uff0c\u628a <code>frame<\/code> \u7684\u53c2\u6570 \u8d4b\u503c\u7ed9 <code>InputFilter<\/code>\u3002\u7136\u540e\u8c03\u7528 <code>configure_filtergraph()<\/code> \u521d\u59cb\u51fa filtergraph\uff0c\u6ca1\u8c03\u7528 <code>ifilter_parameters_from_frame()<\/code> \u4e4b\u524d\uff0c<code>InputFilter<\/code> \u5927\u90e8\u5206\u53c2\u6570\u662f\u7a7a\uff0c\u6240\u4ee5 <code>need_reinit<\/code> \u80af\u5b9a\u662f1\u3002<code>configure_filtergraph()<\/code> \u8fd9\u4e2a\u51fd\u6570\u7279\u522b\u91cd\u8981\uff0c\u5c31\u662f\u5728\u8fd9\u91cc\u628a <code>InputStream::filters<\/code> \u8ddf <code>OutputStream::filter<\/code> LINK \u8d77\u6765\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u4ed4\u7ec6 \u5206\u6790 <code class=\"prettyprint\" >configure_filtergraph()<\/code> \u7684\u5185\u90e8\u903b\u8f91\u3002\u8d34\u4e0a\u4ee3\u7801\u56fe\uff0c\u91cd\u70b9\u4ee3\u7801\u7528\u7ea2\u7b14\u5708\u51fa\u6765\u4e86\uff0c\u6ca1\u6709\u5708\u51fa\u6765\u7684\u662f\u4e0d\u4f1a\u6267\u884c\u6216\u8005\u662f\u68c0\u6d4b\u7c7b\u578b\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"924\" height=\"806\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-10-4.png\" alt=\"\" class=\"wp-image-345\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"762\" height=\"535\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-10-5.png\" alt=\"\" class=\"wp-image-340\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d41\u7a0b\u56fe\u8ddf\u4ee3\u7801\u76f8\u5bf9\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\uff0c\u4e3b\u8981\u662f <code class=\"prettyprint\" >avfilter_graph_parse2()<\/code> \u51fd\u6570\u540e\u9762\u7684\u4e24\u4e2a\u53d8\u91cf <code>inputs<\/code> \uff0c<code>outputs<\/code>\u3002\u5b9e\u9645\u4e0a\u8fd9\u4e24\u4e2a\u53d8\u91cf\u76f8\u5f53\u4e8e\u4e00\u4e2afilter\u5934\u5c3e\u8fde\u63a5\u5668\u3002\u753b\u4e2a\u6d41\u7a0b\u56fe\u4fbf\u4e8e\u7406\u89e3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"984\" height=\"157\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-10-6.png\" alt=\"\" class=\"wp-image-341\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230 <code class=\"prettyprint\" >configure_filtergraph()<\/code> \u628a <code>InputFilter<\/code> \u8ddf <code>OutputFilter<\/code> \u5173\u8054\u4e86\u5728\u4e00\u8d77\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >configure_input_filte()<\/code> \u7684\u903b\u8f91\u4e5f\u76f8\u5bf9\u7b80\u5355\uff0c\u5c31\u662f\u628a <code>InputFilter::filter<\/code> \u521d\u59cb\u5316 \u4e3a <code>buffer filter<\/code>, \u7136\u540e Link \u5230 <code>inputs[0]-&gt;filter_ctx<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >configure_output_filte()<\/code>\u628a <code>OutputFilter::filter<\/code> \u521d\u59cb\u5316 \u4e3a <code>buffersink filter<\/code>\uff0c \u7136\u540e Link \u5230 <code>outputs[0]-&gt;filter_ctx<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >decode_audio()<\/code> \u7684\u903b\u8f91\u8ddf <code>decode_video()<\/code> \u7c7b\u4f3c\uff0c\u5c31\u4e0d\u518d\u5206\u6790\u4e86<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a9\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\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],"tags":[],"class_list":["post-346","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-decode_video - \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\" 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