{"id":395,"date":"2022-01-31T18:15:33","date_gmt":"2022-01-31T10:15:33","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=395"},"modified":"2022-06-11T03:14:33","modified_gmt":"2022-06-10T19:14:33","slug":"ffmpeg%e5%91%bd%e4%bb%a4%e5%88%86%e6%9e%90-output_ts_offset","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=395","title":{"rendered":"ffmpeg\u547d\u4ee4\u5206\u6790-output_ts_offset"},"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>\u672c\u7cfb\u5217\u4e3b\u8981\u5206\u6790\u5404\u79cd ffmpeg \u547d\u4ee4\u53c2\u6570 \u5728\u4ee3\u7801\u91cc\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u3002a.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>\u547d\u4ee4\u5982\u4e0b\uff1a<code class=\"prettyprint\" >ffmpeg -i a.mp4 -t 5 -output_ts_offset 5 a2.flv<\/code><\/p>\n\n\n\n<p><strong>-output_ts_offset 5<\/strong> \uff0c\u8bbe\u7f6e\u8f93\u51fa\u6587\u4ef6\u7684\u6240\u6709\u6d41\u7684\u7b2c\u4e00\u5e27\u4f4d5\u79d2\uff0c\u540e\u7eed\u5e27\u4ece5\u79d2\u5f00\u59cb\u9012\u589e\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p><strong>\u547d\u4ee4\u884c\u53c2\u6570 -output_ts_offset \u5b9a\u4e49\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >options_table.h 92\u884c\n{&quot;output_ts_offset&quot;, &quot;set output timestamp offset&quot;, OFFSET(output_ts_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E}<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff0c\u672c\u6b21\u7684\u547d\u4ee4\u884c\u53c2\u6570\u4e0d\u5728 ffmpeg_opt.c \u91cc\u9762\u5b9a\u4e49\u4e86\uff0c\u800c\u662f\u5728 libavformat \u76ee\u5f55\u4e0b\u7684 options_table.h \u6587\u4ef6\u91cc\u9762\u3002<\/p>\n\n\n\n<p>\u5728\u524d\u9762\u6587\u7ae0\u300aFFmpeg\u6e90\u7801\u5206\u6790-\u547d\u4ee4\u884c\u300b\uff0c\u5206\u6790\u8fc7 \u547d\u4ee4\u884c\u53c2\u6570\u67e5\u627e option \u7684\u903b\u8f91\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\uff0c\u5728 cmdutil.c \u7b2c 803 \u884c\uff0c\u8c03\u7528 find_option(options, opt)\uff0c\u4f18\u9009\u67e5\u627e ffmepg_opt.c \u91cc\u9762\u5b9a\u4e49\u7684 options \u9009\u9879\u3002<\/p>\n\n\n\n<p>2\uff0c\u5728 ffmepg_opt.c \u5b9a\u4e49\u7684 options \u91cc\u627e\u4e0d\u5230 output_ts_offset \uff0c\u5c31\u4f1a\u8c03 opt_default(NULL, opt, argv[optindex])\uff0c\u4eceAVClass \u91cc\u9762\u67e5\u627e\uff0c\u4e5f\u5c31\u662f \u4ece options_table.h \u7684\u9009\u9879\u91cc\u67e5\u627e\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-alpha-channel-opacity\"\/>\n\n\n\n<p>\u67e5\u627e\u8fc7\u7a0b\u6e90\u7801\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1444\" height=\"815\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-10-1.png\" alt=\"\" class=\"wp-image-394\"\/><\/figure>\n\n\n\n<p>\u4ece opt_default() \u51fd\u6570\u53ef\u4ee5\u770b\u51fa\uff0c*<strong>fc = avformat_get_class()<\/strong> \uff0cAVFormat \u5bf9\u5e94\u7684 AVClass \u80fd\u627e\u5230 output_ts_offset \u8fd9\u4e2a\u53c2\u6570\u7684\u5b9a\u4e49\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >cmdutil.c 578\u884c\nif ((o = opt_find(&amp;fc, opt, NULL, 0,\n                     AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {\n    av_dict_set(&amp;format_opts, opt, arg, FLAGS); \/\/\u6ce8\u610f\u8fd9\u91cc\n    if (consumed)\n        av_log(NULL, AV_LOG_VERBOSE, &quot;Routing option %s to both codec and muxer layer\\n&quot;, opt);\n    consumed = 1;\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u91cd\u70b9\u4ee3\u7801\u662f <strong>av_dict_set(&amp;format_opts, opt, arg, FLAGS)<\/strong>\uff0c\u628a <strong>-output_ts_offset 60<\/strong> \u7684\u503c\u8bbe\u7f6e\u8fdb\u53bb <strong>format_opts<\/strong> \u8fd9\u4e2a\u5168\u5c40\u53d8\u91cf\u91cc\u9762\u4e86\u3002<\/p>\n\n\n\n<p>\u63a5\u4e0b\u6765\u518d\u770b\u770b format_opts \u8fd9\u4e2a\u5168\u5c40\u53d8\u91cf\u5728\u54ea\u91cc\u4f7f\u7528\u4e86\uff0c<\/p>\n\n\n\n<p>\u56e0\u4e3a <strong>-output_ts_offset 60<\/strong> \u662f\u4f5c\u7528\u4e8e\u8f93\u51fa\u6587\u4ef6\u7684\u53c2\u6570\uff0c\u6240\u4ee5\u57fa\u672c\u53ef\u4ee5\u731c\u5230\uff0c\u5c31\u5728 open_output_file() \u51fd\u6570\u91cc\u9762\u7528\u4e86 format_opts \uff0c\u6253\u5f00\u8f93\u51fa\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u628aformat_opts \u4f20\u9012\u8fdb\u53bb\u3002<\/p>\n\n\n\n<p>\u679c\u7136\uff0c\u5728 ffmpeg_opt.c 2146\u884c\uff0copen_output_file() \u51fd\u6570\u91cc\u9762\u6709\u8fd9\u6837\u4e00\u884c\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg_opt.c 2146\u884c\nav_dict_copy(&amp;of-&gt;opts, o-&gt;g-&gt;format_opts, 0);<\/code><\/pre>\n\n\n\n<p>\u628a o-&gt;g-&gt;format_opts \u8d4b\u503c \u7ed9 of-&gt;opts\u3002<\/p>\n\n\n\n<p>\u8bfb\u8005\u53ef\u80fd\u4f1a\u7591\u60d1\uff0c \u5168\u5c40\u53d8\u91cf format_opts \u662f\u600e\u4e48\u8f6c\u79fb\u5230 o-&gt;g-&gt;format_opts \u7684\uff0c\u8bf7\u770b\u4e4b\u524d\u7684\u6587\u7ae0 \u300aFFmpeg\u6e90\u7801\u5206\u6790-\u547d\u4ee4\u884c\u300b\uff0c\u8fd9\u91cc\u4e0d\u518d\u8bb2\u8ff0\u3002<\/p>\n\n\n\n<p>\u518d\u63a5\u7740\u627e of-&gt;opts \u7528\u5728\u54ea\u91cc\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg_opt.c 2559\u884c\n\/* open the file *\/\nif ((err = avio_open2(&amp;oc-&gt;pb, filename, AVIO_FLAG_WRITE, &amp;oc-&gt;interrupt_callback, &amp;of-&gt;opts)) &lt; 0) { \/\/\u6ce8\u610f\u8fd9\u91cc\n        print_error(filename, err);\n        exit_program(1);\n}<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 of-&gt;opts \u4f5c\u4e3a\u4e00\u4e2a\u53c2\u6570\uff0c\u4e22\u8fdb\u53bb avio_open2() api\u51fd\u6570\u91cc\u9762\u4e86\u3002<\/p>\n\n\n\n<p>\u603b\u7ed3\uff1a<\/p>\n\n\n\n<p>-output_ts_offset \u662fAVFormat \u5e93\u91cc\u9762\u7684\u4e00\u4e2a\u516c\u5171\u53c2\u6570\uff0c\u6240\u4ee5\u5728 \u8c03\u7528 avio_open2() \u7684\u65f6\u5019\uff0c\u628a output_ts_offset \u4f5c\u4e3a\u4e00\u4e2a AVDictionary \u4f20\u9012\u7ed9 avio_open2() \u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u547d\u4ee4\u751f\u6210\u7684 a2.flv \uff0c\u5982\u679c\u7528\u8fc5\u96f7\u64ad\u653e\u5668\u64ad\u653e\uff0c\u53ef\u4ee5\u64ad10s\uff0c\u5f53\u65f6\u7528ffpaly\u64ad\u653e\u53ea\u80fd\u64ad5s\uff0c\u89c6\u9891\u672c\u8eab\u662f5s\u7684\uff0c\u53ea\u662f\u7b2c\u4e00\u5e27pts \u8bbe\u7f6e\u6210\u4e86 5s\u3002<\/p>\n\n\n\n<p>\u4e2a\u4eba\u601d\u8003\uff1a<\/p>\n\n\n\n<p>\u8bb0\u5f97\u6211\u521a\u5f00\u59cb\u5b66 FFmpeg \u7684\u65f6\u5019\uff0c\u770b\u5230AVFrame\u6709\u4e2a pts\uff0c\u6211\u5c31\u5728\u60f3\u7b2c\u4e00\u5e27\u7684pts \u662f\u4e0d\u662f\u90fd\u662f0\u5462\uff1f\u56e0\u4e3a\u4f60\u6253\u5f00\u89c6\u9891\u80af\u5b9a\u8981\u7acb\u5373\u64ad\u653e\uff0c\u4f46\u662f\u8fd9\u4e2a\u7b2c\u4e00\u5e27\u7684pts \u53c8\u662f\u53ef\u4ee5\u624b\u52a8\u6539\u7684\uff0c\u56e0\u4e3a\u89c6\u9891\u6587\u4ef6\u5728\u4f60\u7684\u624b\u91cc\uff0c\u6539\u6570\u636e\u5f88\u5bb9\u6613\u3002<\/p>\n\n\n\n<p>\u90a3\u65f6\u5019\u6211\u5c31\u5728\u60f3\uff0c\u5982\u679c\u4e00\u4e2a\u89c6\u9891\u6587\u4ef6\uff0c\u4ed6\u7684\u7b2c\u4e00\u5e27\u7684pts\u662f 60 s\uff0c\u662f\u4e0d\u662f\u8bf4\u660e\u8fd9\u4e2a\u89c6\u9891\u6253\u5f00\u4e4b\u540e\uff0c\u8981\u8fc7 60s \u624d\u80fd\u64ad\u653e\u7b2c\u4e00\u5e27\uff0c60s \u4e4b\u524d\u64ad\u653e\u5668\u8981\u4e00\u76f4\u9ed1\u5c4f\u3002\u6807\u51c6\u5b9e\u73b0\u662f\u4e0d\u662f\u5e94\u8be5\u8fd9\u6837\u5b50\u3002<\/p>\n\n\n\n<p>\u4eca\u5929\u770b\u5230 ffmpeg \u7684\u547d\u4ee4\u53c2\u6570 output_ ts_ offset \u53ef\u4ee5\u6307\u5b9a \u7b2c\u4e00\u5e27pts\uff0c\u5b9e\u9645\u6d4b\u8bd5\u4e86\u4e0b\u3002\u5176\u5b9e\u539f\u6765\u6839\u672c\u5c31\u6ca1\u6709\u4ec0\u4e48\u6807\u51c6\u7684\u64ad\u653e\u5668\u5b9e\u73b0\uff0c\u4e00\u5b9a\u8981\u5982\u4f55\u5982\u4f55\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>\u5728\u8fc5\u96f7\u64ad\u653e\u5668\u4e0b\uff0c\u6211\u90a3\u4e2a\u7b2c\u4e00\u5e27\u662f60s\u7684\u89c6\u9891\uff0c\u524d\u976260s\u786e\u5b9e\u662f\u9ed1\u5c4f\u7684\u3002\u6211\u7684\u89c6\u9891\u53ea\u670910s\uff0c\u6240\u4ee5\u8fc5\u96f7\u64ad\u653e\u5668\u8fdb\u5ea6\u6761\u662f 60+ 10s\uff0c\u4e00\u517170s\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u6211\u7528 ffplay \u64ad\u653e\uff0c\u76f4\u63a5\u5f00\u59cb\u64ad\u653e\u4e86\uff0c\u6839\u672c\u6ca1\u6709\u9ed1\u5c4f\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u867d\u7136\u6709 pts \u8fd9\u4e2a\u4e00\u4e2a\u4e1c\u897f\uff0c\u4f46\u4ed6\u7684\u503c\u662f\u53ef\u4ee5\u968f\u4fbf\u6539\uff0c\u800c\u4e14\u5bf9\u4e8e\u64ad\u653e\u5668\u800c\u8a00\uff0c\u64ad\u653e\u5668\u60f3\u600e\u4e48\u89e3\u91ca\u5c31\u600e\u4e48\u89e3\u91ca\u3002\u6ca1\u4ec0\u4e48\u6807\u51c6\u4e0d\u6807\u51c6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002 \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 \u672c\u7cfb\u5217\u4e3b\u8981\u5206\u6790\u5404\u79cd ff [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,17],"tags":[],"class_list":["post-395","post","type-post","status-publish","format-standard","hentry","category-ffmpeg","category-ffmpeg-cmds"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ffmpeg\u547d\u4ee4\u5206\u6790-output_ts_offset - \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=395\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ffmpeg\u547d\u4ee4\u5206\u6790-output_ts_offset - \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 \u672c\u7cfb\u5217\u4e3b\u8981\u5206\u6790\u5404\u79cd ff [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.xianwaizhiyin.net\/?p=395\" \/>\n<meta property=\"og:site_name\" content=\"\u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-31T10:15:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-10T19:14:33+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/.\/wp-content\/uploads\/2022\/01\/cmd-10-1.png\" \/>\n<meta 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