{"id":3246,"date":"2015-12-12T10:35:23","date_gmt":"2015-12-12T02:35:23","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=3246"},"modified":"2015-12-12T10:36:10","modified_gmt":"2015-12-12T02:36:10","slug":"ffmpeg-%e4%bd%bf%e7%94%a8-ffmpeg-%e5%b0%86-mjpeg-%e6%a0%bc%e5%bc%8f%e8%bd%ac%e6%8d%a2%e4%b8%ba-h-264-%e6%a0%bc%e5%bc%8f%e7%9a%84-mp4","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=3246","title":{"rendered":"[FFMPEG] \u4f7f\u7528 FFMPEG \u5c06 MJPEG \u683c\u5f0f\u8f6c\u6362\u4e3a H.264 \u683c\u5f0f\u7684 MP4"},"content":{"rendered":"<p>\u8fd9\u51e0\u5929\uff0c\u7528RVMedia\u7684\u4ece\u6444\u50cf\u5934\u6293\u53d6\u89c6\u9891\uff0c\u4f46RVMedia 4.0.2 \u53ea\u652f\u6301\u5f55\u5236\u6210 MJPEG \u683c\u5f0f\uff0c\u800c MJPEG \u7684\u683c\u5f0f\u662f\u4ee5JPEG \u683c\u5f0f\u5b58\u8d2e\u7684\u56fe\u7247\u5e8f\u5217\uff0c\u53ea\u662f\u5728\u524d\u9762\u52a0\u4e0a\u4e86\u4e00\u4e2a MIME \u4fe1\u606f\uff0c\u5176\u683c\u5f0f\u53c2\u8003\u00a0<a href=\"http:\/\/blog.chinaunix.net\/uid-22670933-id-1771591.html\">http:\/\/blog.chinaunix.net\/uid-22670933-id-1771591.html<\/a>\u3002\u91cc\u9762\u6ca1\u6709\u89c6\u9891\u7684\u65f6\u95f4\u4fe1\u606f\uff0c\u4e5f\u5c31\u6ca1\u6709\u5e27\u901f\u7387\u7684\u4fe1\u606f\uff0c\u6240\u4ee5\uff0c\u6709\u4e9b\u4e1c\u897f\u5c31\u9700\u8981\u81ea\u5df1\u505a\u4e00\u4e9b\u5de5\u4f5c\u6765\u5904\u7406\uff0c\u4fdd\u8bc1\u8f6c\u7801\u6210 H.264 \u7684 MP4 \u89c6\u9891\u6ca1\u6709\u201c\u88ab\u52a0\u901f\u201d\u3002<\/p>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u8981\u5728\u5f55\u5236\u89c6\u9891\u65f6\uff0c\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u8ba1\u6570\uff0c\u8bb0\u5f55\u89c6\u9891\u5f55\u5236\u7684\u65f6\u95f4\u548c\u5f55\u5236\u7684\u603b\u5e27\u6570\uff08\u53ef\u4ee5\u5728OnGetImage\u4e8b\u4ef6\u91cc\u8ba1\u6570\uff0c\u6bcf\u5e27\u90fd\u4f1a\u89e6\u53d1\u5b83\u4e00\u6b21\uff09\uff0c\u7136\u540e\u6839\u636e\u5b83\u8ba1\u7b97\u51fa\u4e00\u4e2a\u5e73\u5747\u7684\u5e27\u901f\u7387\uff08\u603b\u5e27\u6570\/\u603b\u65f6\u95f4\uff09\u3002<\/p>\n<p>\u7136\u540e\uff0c\u7136\u540e\u8c03\u7528 FFMPEG \u7684\u547d\u4ee4\u884c\u53c2\u6570\u8fdb\u884c\u8f6c\u7801\uff0c\u6216\u8005\u662f\u76f4\u63a5\u8c03\u7528\u76f8\u5e94\u7684\u52a8\u6001\u94fe\u63a5\u5e93\u8f6c\u7801\uff0c\u672c\u4eba\u8f83\u61d2\uff0c\u6240\u4ee5\u7528\u547d\u4ee4\u884c\u53c2\u6570\u6765\u8c03\u7528\uff0c\u4f7f\u7528\u4e86 TDOSCommand \u8fd9\u4e2a\u7ec4\u4ef6\u3002\u8fd9\u4e2a\u7ec4\u4ef6\u8981\u5728 Delphi 10 \u7b49\u7248\u672c\u4e2d\u4f7f\u7528\u7684\u8bdd\uff0c\u9700\u8981\u7b80\u5355\u505a\u4e00\u70b9\u70b9\u4fee\u6539\uff0c[0..MaxInt] of Char \u6539\u4e3a [0..0] of Char \u5c31\u53ef\u4ee5\u4e86\uff0c\u5269\u4e0b\u7684\u90fd\u4e0d\u9700\u8981\u53d8\u52a8\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u4e00\u6bb5\u5177\u4f53\u7684\u8f6c\u6362\u5b9e\u73b0\u4ee3\u7801\uff0c\u4f9b\u5927\u5bb6\u53c2\u8003\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">var\r\n  ADosCmd: TDosCommand;\r\n  AUsedTime: Cardinal;\r\n  AFrameRate: Integer;\r\nbegin\r\n  AUsedTime := GetTickCount - FCaptureStartTime;\r\n  AFrameRate := FCapturedFrames * 1000 div AUsedTime;\r\n  DeleteFile(TempFileName + '.mp4');\r\n  ADosCmd := TDosCommand.Create(nil);\r\n  ADosCmd.CommandLine := 'ffmpeg -framerate ' + IntToStr(AFrameRate) + ' -i ' +\r\n    ExtractFileName(TempFileName + '.mjpeg') + ' -vcodec h264 ' +\r\n    ExtractFileName(TempFileName + '.mp4');\r\n  ADosCmd.ShowWindow := swHide;\r\n  ADosCmd.Execute;\r\n  while ADosCmd.Active do\r\n  begin\r\n    Sleep(50);\r\n    Application.ProcessMessages;\r\n  end;\r\n  FreeAndNil(ADosCmd);\r\n  DeleteFile(TempFileName+'.mjpeg');\r\nend;<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u51e0\u5929\uff0c\u7528RVMedia\u7684\u4ece\u6444\u50cf\u5934\u6293\u53d6\u89c6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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