{"id":2913,"date":"2012-11-04T13:27:19","date_gmt":"2012-11-04T05:27:19","guid":{"rendered":"http:\/\/blog.dword1511.info\/?p=2913"},"modified":"2016-03-31T00:21:06","modified_gmt":"2016-03-30T16:21:06","slug":"%e7%94%a8-ffmpeg-%e5%ae%9e%e7%8e%b0%e8%a7%86%e9%a2%91%e7%b2%be%e7%a1%ae%e5%88%86%e6%ae%b5","status":"publish","type":"post","link":"http:\/\/blog.dword1511.info\/?p=2913","title":{"rendered":"\u7528 ffmpeg \u5b9e\u73b0\u89c6\u9891\u7cbe\u786e\u5206\u6bb5"},"content":{"rendered":"

ffmpeg<\/em> \u8fd9\u73a9\u610f\u633a\u6df7\u86cb\u7684\uff0c\u5bf9\u4e8e\u5927\u90e8\u5206\u7f16\u7801\u9009\u65f6\u90fd\u7cbe\u786e\u4e0d\u5230\u79d2\uff08\u4e00\u822c\u53ea\u80fd\u5728 I-Frame \u5904\u5206\u5272\uff09\u3002\u4e8e\u662f\uff0c\u5982\u679c\u60f3\u8981\u7cbe\u786e\u4e00\u4e9b\u7684\u8bdd\uff0c\u8fd8\u5f97\u505a\u4e9b\u989d\u5916\u7684\u5de5\u4f5c\u3002<\/p>\n

<\/p>\n

\u4ee5\u4e0b\u9ed8\u8ba4\u8f93\u5165\u6587\u4ef6\u662f in.avi \uff0c\u8f93\u51fa\u6587\u4ef6\u662f out.avi \uff0c\u5176\u4f59\u4e3a\u4e34\u65f6\u6587\u4ef6\u3002<\/p>\n

    \n
  1. \u9996\u5148\u5148\u5927\u81f4\u622a\u53d6\u4f60\u8981\u7684\u90a3\u4e00\u6bb5\u89c6\u9891\uff0c\u6ce8\u610f\u5728\u5f00\u5934\u548c\u7ed3\u5c3e\u7559\u5927\u6982 10 \u79d2\u949f\u7684\u4f59\u91cf\u3002
    \n~$<\/span> ffmpeg -ss [START_TIME – 10]<\/em><\/span> -i in.avi -vcodec copy -acodec copy -t [DURATION + 20]<\/em><\/span> pre.avi<\/span>
    \n\u53e6\u5916\u518d\u7f57\u55e6\u4e00\u53e5\uff0cffmpeg \u652f\u6301\u7684\u65f6\u95f4\u683c\u5f0f\u6709 123.4<\/span> \u8fd9\u6837\u7684\u79d2\u949f\u683c\u5f0f\u548c 0:00:05.6<\/span> \u8fd9\u6837\u7684\u65f6\u95f4\u683c\u5f0f\uff0c\u4e24\u79cd\u683c\u5f0f\u90fd\u53ef\u4ee5\u4e0d\u5e26\u5c0f\u6570\u90e8\u5206\u3002
    \n\u6ce8\u610f\u8fd9\u4e2a\u6b65\u9aa4\u4e07\u4e07\u4e0d\u80fd\u7701\uff0c\u4f59\u91cf\u4e5f\u4e0d\u80fd\u7559\u5f97\u8fc7\u5927\uff0c\u5426\u5219\u5f53\u5fc3\u6267\u884c\u6b65\u9aa4 3<\/em> \u7684\u65f6\u5019 ffmpeg<\/em> \u7684 buffer \u628a\u4f60\u7684\u5185\u5b58\u5e72\u7206\u3002<\/strong><\/li>\n
  2. \u7136\u540e\u628a\u89c6\u9891\u8f6c\u6362\u6210\u5e27\u4e0e\u5e27\u4e4b\u95f4\u4e0d\u76f8\u5173\u7684\u7f16\u7801\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u53d7\u5230\u53ea\u80fd\u5728 I-Frame \u5904\u5206\u5272\u7684\u9650\u5236\u4e86\uff0c\u540c\u65f6\u4e3a\u4e86\u4fdd\u9669\u8d77\u89c1\u97f3\u9891\u90e8\u5206\u4e5f\u8f6c\u6210 PCM<\/strong> \u3002\u8fd9\u91cc\u4f1a\u7528\u5230 Motion JPEG<\/strong> \u7f16\u7801\uff0c\u4e4b\u6240\u4ee5\u4e0d\u7528 rawvideo<\/em> \u5012\u4e0d\u662f\u56e0\u4e3a\u6587\u4ef6\u4f53\u79ef\u592a\u5927\u4e86\uff0c\u800c\u662f\u56e0\u4e3a\u65e0\u8bba\u662f ffmpeg<\/em> \u8fd8\u662f mplayer<\/em>\/mencoder<\/em> \u5728\u5904\u7406\u8fd9\u8d27\u7684\u65f6\u5019\u90fd\u4f1a\u51fa\u73b0\u4e25\u91cd\u7684\u97f3\u753b\u4e0d\u540c\u6b65\u3002<\/strong>
    \n~$<\/span> ffmpeg -i pre.avi -vcodec mjpeg -qscale 1 -acodec pcm_s16le pre.mov<\/span><\/li>\n
  3. \u7136\u540e\u9009\u6bb5\u5e76\u4e14\u538b\u5236\u3002\u6ce8\u610f\u8fd9\u4e24\u6b65\u6700\u597d\u4e00\u8d77\u505a\uff0c\u56e0\u4e3a\u5982\u679c\u7528 copy<\/em> \u7684 a\/vcodec \u6765\u505a\u7684\u8bdd\uff0c\u5f88\u5bb9\u6613\u51fa\u73b0\u4e00\u4e9b\u5947\u602a\u7684\u73b0\u8c61\u3002<\/strong>
    \n~$<\/span> ffmpeg -i pre.mov -ss [START_TIME, about 10 secs]<\/em><\/span>\u00a0-pix_fmt yuv420p -vcodec libx264 -crf 23 -acodec libvo_aacenc -ab 128k -t [DURATION]<\/em><\/span> out.avi<\/span><\/li>\n
  4. \u5b8c\u6210\u540e\u7528 mplayer \u786e\u8ba4\u4e00\u4e0b\uff0c\u5982\u679c\u51fa\u73b0\u6b8b\u75be\u6216\u8005\u6ca1\u9609\u5e72\u51c0\u7684\u73b0\u8c61\u5c31\u9700\u8981\u5c0f\u5fc3\u5730\u8c03\u6574\u65f6\u95f4\u4e0a\u7684\u53c2\u6570\uff0c\u91cd\u590d\u6b65\u9aa4 3<\/em> \uff0c\u76f4\u5230\u6ee1\u610f\u3002
    \n\u4f60\u53ef\u4ee5\u5728 mplayer \u91cc\u9762\u6309\u4f4f<\/strong>\u952e\u76d8\u4e0a\u7684\u201c\u2190\u201d<\/em>\u952e\u6765\u68c0\u89c6\u7b2c\u4e00\u5e27\u3002\u6700\u540e\u522b\u5fd8\u4e86\u5220\u6389\u4e24\u4e2a\u4e34\u65f6\u6587\u4ef6\u3002<\/li>\n<\/ol>\n

    (END)<\/p>\n","protected":false},"excerpt":{"rendered":"

    ffmpeg \u8fd9\u73a9\u610f\u633a\u6df7\u86cb\u7684\uff0c\u5bf9\u4e8e\u5927\u90e8\u5206\u7f16\u7801\u9009\u65f6\u90fd\u7cbe\u786e\u4e0d\u5230\u79d2\uff08\u4e00\u822c\u53ea\u80fd\u5728 I-Frame \u5904\u5206\u5272\uff09\u3002\u4e8e\u662f\uff0c\u5982\u679c … \u7ee7\u7eed\u9605\u8bfb\u7528 ffmpeg \u5b9e\u73b0\u89c6\u9891\u7cbe\u786e\u5206\u6bb5<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[14],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=\/wp\/v2\/posts\/2913"}],"collection":[{"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2913"}],"version-history":[{"count":11,"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=\/wp\/v2\/posts\/2913\/revisions"}],"predecessor-version":[{"id":4764,"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=\/wp\/v2\/posts\/2913\/revisions\/4764"}],"wp:attachment":[{"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2913"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2913"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.dword1511.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2913"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}