{"id":1366,"date":"2016-09-09T17:30:15","date_gmt":"2016-09-09T09:30:15","guid":{"rendered":"http:\/\/www.strongd.net\/?p=1366"},"modified":"2016-09-09T17:30:15","modified_gmt":"2016-09-09T09:30:15","slug":"%e4%bd%bf%e7%94%a8-ffmpeg-%e7%bc%a9%e6%94%be%e3%80%81%e8%a3%81%e5%89%aa%e3%80%81%e5%89%aa%e8%be%91%e8%a7%86%e9%a2%91","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=1366","title":{"rendered":"\u4f7f\u7528 ffmpeg \u7f29\u653e\u3001\u88c1\u526a\u3001\u526a\u8f91\u89c6\u9891"},"content":{"rendered":"<header class=\"entry-header\">\n<h1 class=\"entry-title\">\u4f7f\u7528 ffmpeg \u7f29\u653e\u3001\u88c1\u526a\u3001\u526a\u8f91\u89c6\u9891<\/h1>\n<\/header>\n<div class=\"entry-content\">\n<p>\u6211\u4eec\u5e73\u65f6\u4f7f\u7528\u624b\u673a\u62cd\u6444\u7684\u89c6\u9891\u4e00\u822c\u90fd\u57281080p\u53ca\u4ee5\u4e0a\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6bd4\u5982\u5171\u4eab\u7ed9\u670b\u53cb\u7b49\uff0c\u53ef\u80fd\u9700\u8981\u5904\u7406\u4e00\u4e0b\u4f1a\u6bd4\u8f83\u65b9\u4fbf\u3002\u4e0b\u9762\u5217\u51fa\u51e0\u4e2a ffmpeg \u5e38\u7528\u7684\u5904\u7406\u89c6\u9891\u65b9\u6cd5\uff08\u5982\u679c\u53ea\u9700\u8981\u683c\u5f0f\u8f6c\u6362\uff0c\u53ef\u4ee5\u53c2\u8003\u6211\u4e4b\u524d\u7684\u4e00\u7bc7\u6587\u7ae0<a href=\"http:\/\/www.strongd.net\/?p=1364\">\u300a\u4f7f\u7528H264\u7f16\u7801\u8f6c\u6362\u89c6\u9891\u300b<\/a>\uff09<\/p>\n<h2>\u7f29\u5c0f\u89c6\u9891<\/h2>\n<p>\u5047\u8bbe\u539f\u59cb\u89c6\u9891\u5c3a\u5bf8\u662f 1080p\uff08\u5373 1920\u00d71080 px\uff0c16:9\uff09\uff0c\u4f7f\u7528\u4e0b\u9762\u547d\u4ee4\u53ef\u4ee5\u7f29\u5c0f\u5230 480p\uff1a<\/p>\n<pre lang=\"bash\">$ ffmpeg -i a.mov -vf scale=853:480 -acodec aac -vcodec h264 out.mp4<\/pre>\n<p>\u5404\u4e2a\u53c2\u6570\u7684\u542b\u4e49\uff1a<\/p>\n<ul>\n<li>-i a.mov \u6307\u5b9a\u5f85\u5904\u7406\u89c6\u9891\u7684\u6587\u4ef6\u540d<\/li>\n<li>-vf scale=853:480 vf \u53c2\u6570\u7528\u4e8e\u6307\u5b9a\u89c6\u9891\u6ee4\u955c\uff0c\u5176\u4e2d scale \u8868\u793a\u7f29\u653e\uff0c\u540e\u9762\u7684\u6570\u5b57\u8868\u793a\u7f29\u653e\u81f3 853\u00d7480 px\uff0c\u5176\u4e2d\u7684 853px \u662f\u8ba1\u7b97\u800c\u5f97\uff0c\u56e0\u4e3a\u539f\u59cb\u89c6\u9891\u7684\u5bbd\u9ad8\u6bd4\u4e3a 16:9\uff0c\u6240\u4ee5\u4e3a\u4e86\u8ba9\u76ee\u6807\u89c6\u9891\u7684\u9ad8\u5ea6\u4e3a 480px\uff0c\u5219\u5bbd\u5ea6 = 480 x 9 \/ 16 = 853<\/li>\n<li>-acodec aac \u6307\u5b9a\u97f3\u9891\u4f7f\u7528 aac \u7f16\u7801\u3002\u6ce8\uff1a\u56e0\u4e3a ffmpeg \u7684\u5185\u7f6e aac \u7f16\u7801\u76ee\u524d\uff08\u5199\u8fd9\u7bc7\u6587\u7ae0\u65f6\uff09\u8fd8\u662f\u8bd5\u9a8c\u9636\u6bb5\uff0c\u6545\u4f1a\u63d0\u793a\u6dfb\u52a0\u53c2\u6570 \u201c-strict -2\u201d \u624d\u80fd\u7ee7\u7eed\uff0c\u5c3d\u7ba1\u6dfb\u52a0\u5373\u53ef\u3002\u53c8\u6216\u8005\u4f7f\u7528\u5916\u90e8\u7684 libfaac\uff08\u9700\u8981\u91cd\u65b0\u7f16\u8bd1 ffmpeg\uff09\u3002<\/li>\n<li>-vcodec h264 \u6307\u5b9a\u89c6\u9891\u4f7f\u7528 h264 \u7f16\u7801\u3002\u6ce8\uff1a\u76ee\u524d\u624b\u673a\u4e00\u822c\u89c6\u9891\u62cd\u6444\u7684\u683c\u5f0f\uff08\u5c01\u88c5\u683c\u5f0f\u3001\u6587\u4ef6\u683c\u5f0f\uff09\u4e3a mov \u6216\u8005 mp4\uff0c\u8fd9\u4e24\u8005\u7684\u97f3\u9891\u7f16\u7801\u90fd\u662f aac\uff0c\u89c6\u9891\u90fd\u662f h264\u3002<\/li>\n<li>out.mp4 \u6307\u5b9a\u8f93\u51fa\u6587\u4ef6\u540d<\/li>\n<\/ul>\n<p>\u4e0a\u9762\u7684\u53c2\u6570 scale=853:480 \u5f53\u4e2d\u7684\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u5b9e\u9645\u5e94\u7528\u573a\u666f\u4e2d\u901a\u5e38\u53ea\u9700\u6307\u5b9a\u4e00\u4e2a\uff0c\u6bd4\u5982\u6307\u5b9a\u9ad8\u5ea6\u4e3a 480 \u6216\u8005 720\uff0c\u81f3\u4e8e\u5bbd\u5ea6\u5219\u53ef\u4ee5\u4f20\u5165 \u201c-1\u201d \u8868\u793a\u7531\u539f\u59cb\u89c6\u9891\u7684\u5bbd\u9ad8\u6bd4\u81ea\u52a8\u8ba1\u7b97\u800c\u5f97\u3002\u5373\u53c2\u6570\u53ef\u4ee5\u5199\u4e3a\uff1ascale=-1:480\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5 scale=480:-1<\/p>\n<h2>\u00a0\u88c1\u526a\u89c6\u9891<\/h2>\n<p>\u6709\u65f6\u53ef\u80fd\u53ea\u9700\u8981\u89c6\u9891\u7684\u6b63\u4e2d\u4e00\u5757\uff0c\u800c\u4e24\u5934\u7684\u5185\u5bb9\u4e0d\u9700\u8981\uff0c\u8fd9\u65f6\u53ef\u4ee5\u5bf9\u89c6\u9891\u8fdb\u884c\u88c1\u526a\uff08crop\uff09\uff0c\u6bd4\u5982\u6709\u4e00\u4e2a\u7ad6\u5411\u7684\u89c6\u9891 1080 x 1920\uff0c\u5982\u679c\u6307\u5411\u4fdd\u7559\u4e2d\u95f4 1080\u00d71080 \u90e8\u5206\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u547d\u4ee4\uff1a<\/p>\n<pre lang=\"bash\">$ ffmpeg -i a.mov -strict -2 -vf crop=1080:1080:0:420 out.mp4<\/pre>\n<p>\u5176\u4e2d\u7684 crop=1080:1080:0:420 \u624d\u88c1\u526a\u53c2\u6570\uff0c\u5177\u4f53\u542b\u4e49\u662f crop=width:height:x:y\uff0c\u5176\u4e2d width \u548c height \u8868\u793a\u88c1\u526a\u540e\u7684\u5c3a\u5bf8\uff0cx:y \u8868\u793a\u88c1\u526a\u533a\u57df\u7684\u5de6\u4e0a\u89d2\u5750\u6807\u3002\u6bd4\u5982\u5f53\u524d\u8fd9\u4e2a\u793a\u4f8b\uff0c\u6211\u4eec\u53ea\u9700\u8981\u4fdd\u7559\u7ad6\u5411\u89c6\u9891\u7684\u4e2d\u95f4\u90e8\u5206\uff0c\u6240\u4ee5 x \u4e0d\u7528\u504f\u79fb\uff0c\u6545\u4f20\u51650\uff0c\u800c y \u5219\u9700\u8981\u5411\u4e0b\u504f\u79fb\uff1a(1920 \u2013 1080) \/ 2 = 420<\/p>\n<p>\u89c6\u9891\u7f29\u653e\u548c\u88c1\u526a\u662f\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\u7684\uff0c\u5982\u4e0b\u547d\u4ee4\u5219\u4e3a\u5c06\u89c6\u9891\u7f29\u5c0f\u81f3 853\u00d7480\uff0c\u7136\u540e\u88c1\u526a\u4fdd\u7559\u6a2a\u5411\u4e2d\u95f4\u90e8\u5206\uff1a<\/p>\n<pre lang=\"bash\">$ ffmpeg -i IMG_4940.MOV -strict -2 -vf scale=853:480,crop=480:480:186:0 out.mp4<\/pre>\n<h2>\u526a\u8f91\u89c6\u9891<\/h2>\n<p>\u5982\u679c\u6709\u4e00\u6bb5\u5f88\u957f\u7684\u89c6\u9891\u53ea\u9700\u4fdd\u7559\u5176\u4e2d\u7684\u4e00\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u547d\u4ee4\u5bf9\u89c6\u9891\u8fdb\u884c\u526a\u8f91\u3002<\/p>\n<pre lang=\"bash\">$ ffmpeg -i a.mov -ss 00:00:21 -t 00:00:10 -acodec aac -vcodec h264 -strict -2 out.mp4<\/pre>\n<p>\u5176\u4e2d -ss 00:00:21 \u8868\u793a\u5f00\u59cb\u526a\u8f91\u7684\u4f4d\u7f6e\uff08\u65f6\u95f4\u70b9\uff09\uff0c-t 00:00:10 \u8868\u793a\u526a\u8f91\u7684\u957f\u5ea6\uff0c\u5373 10 \u79d2\u949f\u3002<\/p>\n<p>\u5f53\u7136\u4e00\u6bb5\u89c6\u9891\u662f\u53ef\u4ee5\u5728\u4e00\u4e2a\u547d\u4ee4\u91cc\u540c\u65f6\u8fdb\u884c\u526a\u8f91\u3001\u7f29\u653e\u3001\u88c1\u526a\u7684\uff0c\u53ea\u9700\u628a\u76f8\u5173\u7684\u53c2\u6570\u5408\u5728\u4e00\u8d77\u5373\u53ef\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528 ffmpeg \u7f29\u653e\u3001\u88c1\u526a\u3001\u526a\u8f91\u89c6\u9891 \u6211\u4eec\u5e73\u65f6\u4f7f\u7528\u624b\u673a\u62cd\u6444\u7684\u89c6\u9891\u4e00\u822c\u90fd\u57281080p\u53ca\u4ee5\u4e0a\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6bd4\u5982\u5171\u4eab\u7ed9\u670b\u53cb\u7b49\uff0c\u53ef\u80fd\u9700\u8981\u5904\u7406\u4e00\u4e0b\u4f1a\u6bd4\u8f83\u65b9\u4fbf\u3002\u4e0b\u9762\u5217\u51fa\u51e0\u4e2a ffmpeg \u5e38\u7528\u7684\u5904\u7406\u89c6\u9891\u65b9\u6cd5\uff08\u5982\u679c\u53ea\u9700\u8981\u683c\u5f0f\u8f6c\u6362\uff0c\u53ef\u4ee5\u53c2\u8003\u6211\u4e4b\u524d\u7684\u4e00\u7bc7\u6587\u7ae0\u300a\u4f7f\u7528H264\u7f16\u7801\u8f6c\u6362\u89c6\u9891\u300b\uff09 \u7f29\u5c0f\u89c6\u9891 \u5047\u8bbe\u539f\u59cb\u89c6\u9891\u5c3a\u5bf8\u662f 1080p\uff08\u5373 1920\u00d71080 px\uff0c16:9\uff09\uff0c\u4f7f\u7528\u4e0b\u9762\u547d\u4ee4\u53ef\u4ee5\u7f29\u5c0f\u5230 480p\uff1a $ ffmpeg -i a.mov -vf scale=853:480 -acodec aac -vcodec h264 out.mp4 \u5404\u4e2a\u53c2\u6570\u7684\u542b\u4e49\uff1a -i a.mov \u6307\u5b9a\u5f85\u5904\u7406\u89c6\u9891\u7684\u6587\u4ef6\u540d -vf scale=853:480 vf \u53c2\u6570\u7528\u4e8e\u6307\u5b9a\u89c6\u9891\u6ee4\u955c\uff0c\u5176\u4e2d scale \u8868\u793a\u7f29\u653e\uff0c\u540e\u9762\u7684\u6570\u5b57\u8868\u793a\u7f29\u653e\u81f3 853\u00d7480 px\uff0c\u5176\u4e2d\u7684 853px \u662f\u8ba1\u7b97\u800c\u5f97\uff0c\u56e0\u4e3a\u539f\u59cb\u89c6\u9891\u7684\u5bbd\u9ad8\u6bd4\u4e3a 16:9\uff0c\u6240\u4ee5\u4e3a\u4e86\u8ba9\u76ee\u6807\u89c6\u9891\u7684\u9ad8\u5ea6\u4e3a 480px\uff0c\u5219\u5bbd\u5ea6 = 480 x 9 \/ 16 = 853 -acodec aac \u6307\u5b9a\u97f3\u9891\u4f7f\u7528 aac \u7f16\u7801\u3002\u6ce8\uff1a\u56e0\u4e3a ffmpeg \u7684\u5185\u7f6e aac &hellip; <a href=\"https:\/\/www.strongd.net\/?p=1366\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">\u4f7f\u7528 ffmpeg \u7f29\u653e\u3001\u88c1\u526a\u3001\u526a\u8f91\u89c6\u9891<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[77],"class_list":["post-1366","post","type-post","status-publish","format-standard","hentry","category-linux","tag-ffmpeg"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1366"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1366\/revisions"}],"predecessor-version":[{"id":1367,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1366\/revisions\/1367"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}