{"id":296,"date":"2022-01-31T16:59:07","date_gmt":"2022-01-31T08:59:07","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=296"},"modified":"2022-06-11T03:19:47","modified_gmt":"2022-06-10T19:19:47","slug":"ffmpeg%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-open_input_file","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=296","title":{"rendered":"ffmpeg\u6e90\u7801\u5206\u6790-open_input_file"},"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><strong>\u672c\u6587\u4e3b\u8981\u5206\u6790 <code class=\"prettyprint\" >open_input_file()<\/code> ` \u7684\u5185\u90e8\u903b\u8f91\uff0c\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"899\" height=\"433\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-1.png\" alt=\"\" class=\"wp-image-297\"\/><\/figure>\n\n\n\n<p><code class=\"prettyprint\" >open_input_file()<\/code> \u7684\u903b\u8f91\u5b9e\u9645\u4e0a\u662f\u975e\u5e38\u590d\u6742\u7684\uff0c\u4e0a\u9762\u7684\u56fe\u505a\u4e86\u4e00\u4e9b\u7b80\u5316\uff0c\u5982\u679c\u591a\u5757\u6d41\u7a0b\u90fd\u7c7b\u4f3c\u539f\u7406\uff0c\u53ea\u753b\u4e86\u5176\u4e2d\u4e00\u5757\u51fa\u6765\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >open_input_file()<\/code> \u7684\u903b\u8f91 \u592a\u590d\u6742\u4e86\uff0c\u5fc5\u987b\u518d\u8d34\u4e00\u4e0b\u4f2a\u4ee3\u7801\u56fe\u7247\u624d\u80fd\u66f4\u597d\u5730\u8bb2\u89e3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1245\" height=\"800\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-2.png\" alt=\"\" class=\"wp-image-298\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1245\" height=\"717\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-3.png\" alt=\"\" class=\"wp-image-299\"\/><\/figure>\n\n\n\n<p>\u63a5\u4e0b\u6765\u5bf9\u7740\u56fe\u7247\u7684\u4ee3\u7801\u884c\u6570\uff0c\u9010\u884c\u5206\u6790 <code class=\"prettyprint\" >open_input_file()<\/code> \u7684\u4e3b\u8981\u903b\u8f91\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u56fe\u7247<code class=\"prettyprint\" >1011~1018<\/code> \u884c\uff0c\u53ef\u4ee5\u770b\u5230\u8fd9\u4e9b\u4ee3\u7801\u90fd\u662f\u7c7b\u4f3c\u7684\uff0c\u5168\u90fd\u662f\u628a <code>OptionsContext::SpecifierOpt<\/code> \u5b58\u5230 <code>OptionsContext::OptionGroup::AVDictionary<\/code> \u3002\u4f8b\u5982\u628a <code>o-&gt;audio_sample_rate[o-&gt;nb_audio_sample_rate - 1].u.i<\/code> \u5b58\u50a8\u5230 <code>o-&gt;g-&gt;format_opts<\/code>\u3002\u4e4b\u524d\u8bf4\u8fc7 <code>OptionsContext<\/code> \u7684 <code>SpecifierOpt<\/code> \u662f\u6570\u7ec4\u7c7b\u578b\uff0c\u8fd9\u91cc\u53ea\u53d6\u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u6765\u8d4b\u503c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u67d0\u4e9b\u547d\u4ee4\u884c\u53c2\u6570\u5373\u4f7f\u5199\u4e86\u591a\u4e2a\uff0c\u53ea\u6709\u6700\u540e\u4e00\u4e2a\u751f\u6548\uff0c\u4f8b\u5982 <code>-ar 44100 -ar 48000<\/code> \u53ea\u670948000\u751f\u6548\u3002<code>o-&gt;g-&gt;format_opts<\/code> \u662f\u5bb9\u5668\u5c42\u53c2\u6570\uff0c\u57281026\u884c <code>avformat_open_input()<\/code> \u4f20\u9012\u8fdb\u53bb\u6253\u5f00\u6587\u4ef6\u3002\u5206\u6790\u5230\u8fd9\u91cc\uff0c\u662f\u4e0d\u662f\u6709\u79cd\u7115\u7136\u5927\u609f\u7684\u611f\u89c9\uff0c\u547d\u4ee4\u884c\u7684\u53c2\u6570 \u4f8b\u5982 <code>-pix_fmt yuv420p<\/code> \uff0c\u662f\u600e\u4e48\u4e00\u6b65\u4e00\u6b65\u4f20\u9012\u5230\u4ee3\u7801\u91cc\u9762\u7684\u3002<code>-pix_fmt yuv420p<\/code> \u5148\u7ecf\u8fc7 <code>split_command()<\/code>\u5b58\u5230\u4e86 OptionGroup::opts \u91cc\u9762\uff0c\u7136\u540e\u518d\u7ecf\u8fc7 <code>parse_optgroup()<\/code> \u5b58\u5230 <code>OptionsContext::SpecifierOpt* frame_pix_fmt<\/code> \u91cc\u9762\uff0c\u6700\u540e\u5b58\u8fdb <code>o-&gt;g-&gt;format_opts<\/code> \uff0c\u7136\u540e\u653e\u8fdb\u53bb <code>avformat_open_input()<\/code> \u3002<\/li><li>\u56fe\u7247<code>1020~1023<\/code> \u884c\uff0c\u8fd9\u91cc\u7528\u4e86\u4e00\u4e2a\u5b8f\u51fd\u6570\uff0c<code>MATCH_PER_TYPE_OPT()<\/code>\uff0c\u8fd9\u4e2a\u51fd\u6570\u5176\u5b9e\u5c31\u662f\u904d\u5386 <code>OptionsContext<\/code> \u7684 \u67d0\u4e2a<code>SpecifierOpt<\/code>\uff0c\u518d\u6b21\u63d0\u9192\u4e0b <code>OptionsContext::SpecifierOpt<\/code> \u662f\u4e00\u4e2a\u6570\u7ec4\u3002\u904d\u5386\u4f1a\u53d6\u7b2c\u4e00\u4e2a\u7b26\u5408\u6761\u4ef6\u7684 <code>SpecifierOpt<\/code>\u8fd4\u56de\u3002<code>1020~1023<\/code> \u884c \u904d\u5386\u7684<code>SpecifierOpt<\/code>\u662f <code>OptionsContext::codec_names<\/code> \uff0c\u6307\u5b9a\u7684<code>medietype<\/code>\u662f <code>&#039;v&#039;<\/code> \uff0c\u4e5f\u5c31\u662f\u547d\u4ee4\u884c\u7ecf\u5e38\u7528\u7684 <code>-xxx:v<\/code> \uff0c\u540e\u9762\u7684 <code>&#039;v&#039;<\/code> \u5c31\u662f\u5339\u914d\u6761\u4ef6\u3002<\/li><li>\u56fe\u7247<code>1026<\/code> \u884c\uff0c<code>err = avformat_open_input(&amp;ic, filename, file_iformat, &amp;o-&gt;g-&gt;format_opts);<\/code>\u4f20\u9012 <code>o-&gt;g-&gt;format_opts<\/code>\u6253\u5f00\u6587\u4ef6\u3002<\/li><li>\u56fe\u7247<code>1028~1051<\/code> \u884c\uff0c\u8fd9\u90e8\u5206\u4ee3\u7801\u662f\u5904\u7406 \u547d\u4ee4\u884c\u53c2\u6570 <code>-ss<\/code> \uff0c<code>-sseof<\/code>\u7684\uff0c\u5c31\u662f\u53ea\u53d6\u8f93\u5165\u6587\u4ef6\u7684\u524dn\u79d2\u6216\u8005\u540en\u79d2\u505a\u5904\u7406\uff0c\u8fd9\u91cc\u4f1a\u6d89\u53ca\u5230 seek \u64cd\u4f5c\u3002<\/li><li>\u56fe\u7247<code>1075<\/code> \u884c\uff0c<code>add_input_stream()<\/code>\uff0c\u6dfb\u52a0\u6587\u4ef6\u7684\u8f93\u5165\u6d41\u5230 \u5168\u5c40\u53d8\u91cf <code>input_streams<\/code>\uff0c\u8fd9\u4e2a\u51fd\u6570\u76f8\u5bf9\u590d\u6742\uff0c\u5728\u4e0b\u4e00\u6bb5\u843d\u8be6\u7ec6\u5206\u6790\u3002<\/li><li>\u56fe\u7247<code>1080~1100<\/code> \u884c\uff0c\u8fd9\u90e8\u5206\u4ee3\u7801 \u662f\u7533\u8bf7\u4e00\u4e2a <code>InputFile<\/code>\u53d8\u91cf\uff0c\u7136\u540e\u628a <code>OptionsContext<\/code> \u7684\u4e00\u4e9b\u53c2\u6570\u8d4b\u503c\u7ed9 <code>InputFile<\/code>\uff0c\u4e00\u4e2a <code>InputFile<\/code>\u5bf9\u5e94\u4e00\u4e2a\u8f93\u5165\u6587\u4ef6\u3002\u56e0\u4e3a\u8dd1\u5b8c <code>open_input_file()<\/code>\uff0c<code>OptionsContext<\/code> \u5c31\u4f1a\u91ca\u653e\u4e86\uff0c\u6240\u4ee5\u4e00\u4e9b\u53c2\u6570\u5fc5\u987b\u8d4b\u503c\u7ed9 <code>InputFile<\/code> \u65b9\u4fbf\u540e\u9762\u5904\u7406\u3002<code>InputFile<\/code> \u662f\u4e00\u4e2a\u65b0\u7684\u6570\u636e\u7ed3\u6784\u3002<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-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>\u81f3\u6b64\uff0copen_input_file \u7684\u4e00\u4e9b\u7b80\u5355\u903b\u8f91\u5df2\u7ecf\u5206\u6790\u5b8c\u4e86\uff0c\u63a5\u4e0b\u6765\u5206\u6790\u5185\u90e8\u51fd\u6570 <code class=\"prettyprint\" >add_input_stream()<\/code>\u3002<\/p>\n\n\n\n<p>\u8981\u7406\u89e3 <code class=\"prettyprint\" >add_input_stream()<\/code>\uff0c\u5fc5\u987b\u5148\u4e86\u89e3 2\u4e2a\u65b0\u7684\u6570\u636e\u7ed3\u6784\uff0c<code>InputFile<\/code>\uff0c<code>InputStream<\/code>\uff0c\u8bf7\u5148\u770b\u6e90\u7801\u81ea\u884c\u9605\u8bfb\u8fd9\u4e24\u4e2a\u7ed3\u6784\u4f53\u7684\u58f0\u660e\u3002<\/p>\n\n\n\n<p>\u4ee5\u547d\u4ee4\u884c<code class=\"prettyprint\" >ffmpeg -i a.mp4 b.flv<\/code> \u4e3a\u4f8b\uff0c\u8f93\u5165\u6587\u4ef6 <code>a.mp4<\/code> \u53ea\u6709\u4e24\u4e2a\u6d41\uff0c\u4e00\u4e2a\u97f3\u9891\uff0c\u4e00\u4e2a\u89c6\u9891\uff0c\u8dd1\u5b8c <code>open_input_file()<\/code> \u4e4b\u540e\u5f62\u6210\u7684\u6570\u636e\u5173\u7cfb\u56fe\u5982\u4e0b\uff0c<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1235\" height=\"652\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-4.png\" alt=\"\" class=\"wp-image-300\"\/><\/figure>\n\n\n\n<p>\u5982\u56fe\u6240\u793a\uff0c\u4ee3\u7801\u91cc\u6709\u4e24\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c<code class=\"prettyprint\" >input_files[]<\/code>\uff0c<code>input_streams[]<\/code>\u3002\u4ee3\u8868\u6709\u591a\u5c11\u4e2a\u8f93\u5165\u6587\u4f53\uff0c\u591a\u5c11\u4e2a\u8f93\u5165\u6d41\u3002\u6587\u4ef6\u4e0e\u6d41\u5206\u5f00\u5b58\u50a8\uff0c<code>InputStream<\/code> \u901a\u8fc7 <code>file_index<\/code> \u5b9a\u4f4d\u5230\u6240\u5c5e\u7684 <code>InputFile<\/code> \u7ed3\u6784<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"96\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-5.png\" alt=\"\" class=\"wp-image-301\"\/><\/figure>\n\n\n\n<p>\u63a5\u4e0b\u6765\u8d34\u4e0a <code class=\"prettyprint\" >add_input_stream()<\/code> \u7684\u4ee3\u7801\uff0c\u4ee3\u7801\u7ecf\u8fc7\u5220\u51cf\uff0c\u53ea\u4fdd\u7559\u4e3b\u5e72\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1017\" height=\"784\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-6.png\" alt=\"\" class=\"wp-image-302\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1021\" height=\"826\" src=\".\/wp-content\/uploads\/2022\/01\/ffmpeg_c-3-7.png\" alt=\"\" class=\"wp-image-303\"\/><\/figure>\n\n\n\n<p>\u63a5\u4e0b\u6765\uff0c\u5bf9\u7167\u56fe\u7247\u7684\u4ee3\u7801\uff0c\u9010\u884c\u5206\u6790 <code class=\"prettyprint\" >add_input_stream()<\/code> \u7684\u903b\u8f91\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u56fe\u7247<code class=\"prettyprint\" >727~734<\/code> \u884c\uff0c\u58f0\u660e\u4e00\u4e2a <code>InputStream<\/code> \uff0c\u628a\u4ed6\u4e22\u8fdb\u53bb\u5168\u5c40\u53d8\u91cf <code>input_streams[]<\/code> \uff0c\u7136\u540e\u505a\u4e00\u4e9b\u521d\u59cb\u5316\u8d4b\u503c\u3002<\/li><li>\u56fe\u7247<code>737~741<\/code> \u884c\uff0c\u8fd9\u5757\u4ee3\u7801\u8c03\u7528\u4e86\u4e00\u4e2a\u5b8f\u51fd\u6570 <code>MATCH_PER_STREAM_OPT()<\/code>\uff0c\u8fd9\u4e2a\u5b8f\u51fd\u6570\u8ddf\u524d\u9762\u7684 <code>MATCH_PER_TYPE_OPT()<\/code>\u975e\u5e38\u7c7b\u4f3c\uff0c\u90fd\u662f\u904d\u5386 <code>OptionsContext<\/code> \u7684 \u67d0\u4e2a<code>SpecifierOpt<\/code>\u6570\u7ec4\uff0c\u53ea\u4e0d\u8fc7 <code>MATCH_PER_STREAM_OPT()<\/code> \u6839\u636e stream \u6765\u5339\u914d\uff0c\u800c <code>MATCH_PER_TYPE_OPT()<\/code>\u6839\u636e type \u6765\u5339\u914d\u3002\u53ef\u4ee5\u770b\u5230\uff0c<code>add_input_stream()<\/code> \u91cc\u9762\u7528\u4e86\u5927\u91cf\u7684 <code>MATCH_PER_STREAM_OPT()<\/code>\uff0c\u5c31\u662f\u628a <code>OptionsContext<\/code> \u7684\u503c\u5339\u914d\u53d6\u51fa\u6765\uff0c\u8d4b\u503c\u7ed9 <code>InputStream<\/code>\u3002<\/li><li>\u56fe\u7247<code>748~846<\/code> \u884c\uff0c<code>avcodec_alloc_context3(ist-&gt;dec)<\/code> \u7533\u8bf7\u89e3\u7801\u5668context\uff0c<code>avcodec_parameters_to_context(ist-&gt;dec_ctx, par);<\/code>\u628a\u5bb9\u5668\u5c42\u89e3\u7801\u5668\u4fe1\u606f\u590d\u5236\u7ed9\u89e3\u7801\u5c42\u3002\u4e2d\u95f4\u7ecf\u8fc7\u4e00\u5927\u5806\u7684\u64cd\u4f5c\uff0c\u6700\u540e\u6267\u884c <code>avcodec_parameters_from_context(par, ist-&gt;dec_ctx);<\/code>\u628a\u89e3\u7801\u5c42\u53c2\u6570\uff0c\u66f4\u65b0\u56de\u53bb\u5bb9\u5668stream\u5c42\uff0c\u4e3a\u4ec0\u4e48\u8981\u66f4\u65b0\u56de\u53bb\u5462\uff1f\u4f30\u8ba1\u662f\u540e\u9762\u7528\u5230\u5427\u3002<\/li><\/ol>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >add_input_stream()<\/code>\u5176\u5b9e\u5e76\u6ca1\u6709\u592a\u590d\u6742\uff0c\u5c31\u5e72\u4e86\u4e24\u4ef6\u4e8b\u60c5\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u7533\u8bf7 \u65b0\u7684<code class=\"prettyprint\" >InputStream<\/code>\uff0c\u628a <code>OptionsContext<\/code> \u7684\u53c2\u6570\u4e22\u7ed9 <code>InputStream<\/code>\uff0c\u4e3b\u8981\u8c03 <code>MATCH_PER_STREAM_OPT()<\/code> \u6765\u5b9e\u73b0\u3002<\/li><li>\u7533\u8bf7\u89e3\u7801\u5668context\uff0c\u505a\u4e00\u4e9b\u53c2\u6570\u8d4b\u503c\u3002<\/li><\/ol>\n\n\n\n<p>\u81f3\u6b64\uff0c<code class=\"prettyprint\" >open_input_file()<\/code> \u5df2\u7ecf\u5206\u6790\u5b8c\u6bd5\uff0c\u7b2c\u56db\u7ae0\u5206\u6790 <code>open_output_file()<\/code>\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 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