{"id":397,"date":"2022-01-31T18:17:34","date_gmt":"2022-01-31T10:17:34","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=397"},"modified":"2022-06-11T03:13:52","modified_gmt":"2022-06-10T19:13:52","slug":"ffmpeg%e5%91%bd%e4%bb%a4%e5%88%86%e6%9e%90-vn","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=397","title":{"rendered":"ffmpeg\u547d\u4ee4\u5206\u6790-vn"},"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 -vn -acodec copy output.mp4<\/code><\/p>\n\n\n\n<p>\u4e0a\u9762\u7684\u547d\u4ee4\u662f\u5355\u72ec\u62bd\u53d6\u6587\u4ef6\u4e2d\u7684\u97f3\u9891\u6d41\u5230 \u8f93\u51fa\u6587\u4ef6<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p><strong>\u547d\u4ee4\u884c\u53c2\u6570 -vn \u5b9a\u4e49\u5982\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffmpeg_opt.h 3569\u884c\n{ &quot;vn&quot;,OPT_VIDEO | OPT_BOOL  | OPT_OFFSET | OPT_INPUT | OPT_OUTPUT,{ .off = OFFSET(video_disable) },&quot;disable video&quot; },<\/code><\/pre>\n\n\n\n<p>\u4ece\u4e0a\u9762\u5b9a\u4e49\u53ef\u4ee5\u770b\u51fa\uff0c<strong>-vn<\/strong> \u4f1a\u89e3\u6790\u8d4b\u503c \u7ed9 OptionsContext \u7684 video_disable\u5b57\u6bb5\u3002<\/p>\n\n\n\n<p>OptionsContext \u7684 video_disable\u5b57\u6bb5 \u4f1a\u5728\u54ea\u91cc\u4f7f\u7528\u5462\uff1f\u8bf7\u770b\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1053\" height=\"691\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-11-1.png\" alt=\"\" class=\"wp-image-400\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0co-&gt;video_disable \u63a7\u5236\u4e86 new_video_stream() \u6ca1\u6709\u6267\u884c\uff0c\u5bfc\u81f4\u8f93\u51fa AVFormatContext\u6ca1\u6709 video \u6d41\u3002<\/p>\n\n\n\n<p>\u867d\u7136AVFormatContext\u6ca1\u6709 video \u6d41\uff0c\u4f46\u662f\u89c6\u9891\u6d41\u7684AVPacket \u8fd8\u662f\u4f1a\u4ece\u8f93\u5165\u6587\u4ef6\u8bfb\u53d6\u51fa\u6765\uff0c\u90a3\u8bfb\u53d6\u51fa\u6765\u7684 AVPacket \u4f1a\u5982\u4f55\u5904\u7406\u5462\uff1f<\/p>\n\n\n\n<p>\u5728\u300aFFmpeg \u6e90\u7801\u5206\u6790\u300b\u4e2d\u8bb2\u89e3\u8fc7\uff0c\u6709\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u6570\u7ec4 input_streams[] \uff0c\u6570\u7ec4\u91cc\u5b58\u50a8\u6240\u6709\u7684\u8f93\u5165\u6d41\u3002<\/p>\n\n\n\n<p>\u8bf7\u770b\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"803\" height=\"757\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-11-2.png\" alt=\"\" class=\"wp-image-401\"\/><\/figure>\n\n\n\n<p>\u5728 add_input_stream() \u91cc\u9762 \u521b\u5efa\u8f93\u5165\u6d41\u7684\u65f6\u5019\uff0c ist->discard \u9ed8\u8ba4\u662f 1 \uff08\u9ed8\u8ba4\u8bfb\u51fa\u6765\u7684AVPacket\u5168\u90e8\u4e22\u5f03\uff09\uff0c\u53ea\u6709\u6267\u884c\u4e86 new_video_stream() -> new_output_stream() \u7684\u65f6\u5019\u624d\u4f1a\u628a ist->discard \u8bbe\u7f6e\u6210 0\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>new_output_stream() \u51fd\u6570\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"858\" height=\"198\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-11-3.png\" alt=\"\" class=\"wp-image-402\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 \u5728 ffmpeg_opt.c 1559\u884c\uff0c\u6839\u636e\u8f93\u51fa\u6d41\u6765\u51b3\u5b9a\u8f93\u5165\u6d41\u7684 discard \u7684\u503c\u8981\u4e0d\u8981\u5f00\u542f\u3002<\/p>\n\n\n\n<p>\u8f93\u5165\u6d41\u7684 discard \u5982\u679c\u662f 1\uff0c\u4f1a\u5bfc\u81f4\u4ec0\u4e48\u7ed3\u679c\u5462\uff0c\u518d\u8bf7\u770b\u4e0b\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"745\" height=\"763\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-11-4.png\" alt=\"\" class=\"wp-image-398\"\/><\/figure>\n\n\n\n<p>-vn \u547d\u4ee4\u5206\u6790\u5b8c\u6bd5\u3002<\/p>\n\n\n\n<p><strong>\u603b\u7ed3\uff1a<\/strong><\/p>\n\n\n\n<p>vn \u5bfc\u81f4\u6ca1\u6709\u6267\u884c new_video_stream()\uff0c\u5bfc\u81f4 \u89c6\u9891\u8f93\u5165\u6d41\u7684 ist-&gt;discard \u4e00\u76f4\u662f1 \uff0cist-&gt;discard\u7b49\u4e8e1 \u518d\u5bfc\u81f4 process_input() \u7684\u65f6\u5019\u4e22\u5f03\u8bfb\u53d6\u51fa\u6765\u7684AVPacket\u3002<\/p>\n\n\n\n<p><strong>\u6269\u5c55\u77e5\u8bc6\uff1a<\/strong><\/p>\n\n\n\n<p>Qt creator \u91cc\u9762\u7684 data breakpoit \u7279\u522b\u597d\u7528\uff0c\u60f3\u77e5\u9053\u67d0\u4e2a\u53d8\u91cf\u5728\u54ea\u91cc\u88ab\u4fee\u6539\u4e86\uff0c\u7528 data breakpoit \u65ad\u70b9\u53d8\u91cf\u7684\u5730\u5740\uff0c\u4e0b\u6b21\u53d8\u91cf\u88ab\u4fee\u6539\u5c31\u53ef\u4ee5\u81ea\u52a8\u505c\u5728\u76f8\u5e94\u7684\u4ee3\u7801\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1026\" height=\"812\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-11-5.png\" alt=\"\" class=\"wp-image-399\"\/><\/figure>\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 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