{"id":387,"date":"2022-01-31T18:11:57","date_gmt":"2022-01-31T10:11:57","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=387"},"modified":"2023-03-12T16:26:45","modified_gmt":"2023-03-12T08:26:45","slug":"ffmpeg%e5%91%bd%e4%bb%a4%e5%88%86%e6%9e%90-t","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=387","title":{"rendered":"ffmpeg\u547d\u4ee4\u5206\u6790-t"},"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 10 a2.mp4<\/code><\/p>\n\n\n\n<p><strong>-t 10<\/strong> \uff0c\u4ece\u5f00\u5934\u622a\u53d610\u79d2\u7684\u89c6\u9891\u6570\u636e\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 -t \u5b9a\u4e49\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg_opt.c 3404\u884c\n{ &quot;t&quot;, HAS_ARG | OPT_TIME | OPT_OFFSET | OPT_INPUT | OPT_OUTPUT,{.off = OFFSET(recording_time) },\n        &quot;record or transcode \\&quot;duration\\&quot; seconds of audio\/video&quot;,\n        &quot;duration&quot; },<\/code><\/pre>\n\n\n\n<p>\u4ece\u4e0a\u9762\u5b9a\u4e49\u53ef\u4ee5\u770b\u51fa\uff0c<strong>-t 10<\/strong> \u4f1a\u89e3\u6790\u8d4b\u503c \u7ed9 OptionsContext \u7684 recording_time \u5b57\u6bb5\u3002<\/p>\n\n\n\n<p>\u6211\u521a\u5f00\u59cb\u641c\u7d22\u7684\u65f6\u5019\uff0c\u4ee5\u4e3a\u662f check_recording_time() \u5b9e\u73b0\u4e86\u4e0a\u9762\u90a3\u6761\u547d\u4ee4\u7684\u65f6\u95f4\u9650\u5236\uff0c\u65ad\u70b9\u8c03\u8bd5\u4e0b\u6765\u53d1\u73b0\u4e0d\u662f\uff0c\u6839\u672c\u6ca1\u8dd1\u8fdb\u53bb check_recording_time()\u3002<\/p>\n\n\n\n<p>\u4e00\u6b65\u4e00\u6b65\u52a0\u65ad\u70b9\uff0c\u53d1\u73b0\u5230\u6700\u540e\u4e00\u5e27\u7684\u65f6\u5019 av_buffersrc_add_frame_flags() \u51fd\u6570\u6267\u884c\u4e4b\u540e\uff0cavfilter_graph_request_oldest() \u7acb\u5373\u8fd4\u56de\u4e86 AVERROR_EOF\uff0c\u8fd9\u4e2a\u5f88\u5947\u602a\u3002\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1436\" height=\"733\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg-cmd-8-1.jpg\" alt=\"\" class=\"wp-image-388\"\/><\/figure>\n\n\n\n<p>\u770bffmpeg\u7684\u6e90\u7801\uff0c\u51fd\u6570\u8bf4\u660e\uff0c\u53ea\u6709\u4f20\u9012\u8fdb av_buffersrc_add_frame_flags() \u51fd\u6570 \u7684AVFrame \u662fNULL\uff0c\u4e0b\u6b21\u8c03 avfilter_graph_request_oldest() \u624d\u4f1a\u8fd4\u56de AVERROR_EOF\u3002<\/p>\n\n\n\n<p>\u6700\u540e\u4e00\u5e27AVFrame \u660e\u660e\u4e0d\u662fNULL\uff0c\u5374\u4e5f\u5bfc\u81f4 avfilter_graph_request_oldest() \u8fd4\u56de\u4e86 AVERROR_EOF\u3002\u975e\u5e38\u5947\u602a\u3002<\/p>\n\n\n\n<p>\u80fd\u8ba9 filter \u94fe\u8fd4\u56de\u7ed3\u675f\uff0c\u8f93\u5165\u7684AVFrame \u53c8\u662f\u6b63\u5e38\u7684\uff0c\u6211\u601d\u7d22\u4e8630\u5206\u949f\uff0c\u90a3\u53ea\u80fd\u5728 \u521d\u59cb\u5316 filter\u90a3\u91cc\u641e\u4e86\u70b9\u4e8b\u60c5\u3002<\/p>\n\n\n\n<p>\u91cd\u65b0\u770b\u56de configure_input_video_filter() \u51fd\u6570\uff0c\u53d1\u73b0\u91cc\u9762\u679c\u7136\u7528\u4e86 recording_time \u8fd9\u4e2a\u53d8\u91cf\uff0c\u8bf7\u770b\u4e0b\u56fe\u3002<\/p>\n\n\n\n<p><strong>\u7ea0\u6b63\uff1a\u5e94\u8be5\u662f configure_output_video_filter \uff0c\u800c\u4e0d\u662f configure_input_video_filter<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"961\" height=\"820\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg-cmd-8-2.png\" alt=\"\" class=\"wp-image-389\"\/><\/figure>\n\n\n\n<p>\u603b\u7ed3\uff1a<\/p>\n\n\n\n<p>\u80fd\u8ba9 avfilter_graph_request_oldest() \u8fd4\u56de\u4e86 AVERROR_EOF\uff0c\u6709\u4e24\u79cd\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>1\uff0c\u4f20\u9012\u8fdb av_buffersrc_add_frame_flags() \u51fd\u6570 \u7684AVFrame \u662fNULL\u3002<\/p>\n\n\n\n<p>2\uff0c\u521d\u59cb\u5316filter \u7684\u65f6\u5019\u7528\u4e86 trim filter\uff0c\u65f6\u95f4\u88c1\u526a\u6ee4\u955c\uff0c\u5230\u65f6\u95f4\u4e86\uff0cavfilter_graph_request_oldest() \u4e5f\u4f1a\u8fd4\u56de\u4e86 AVERROR_EOF\u3002<\/p>\n\n\n\n<hr 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