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• How to compile ffmpeg for qt use in windows

  13 avril 2016, par Himiko

  I want to use ffmpeg libs for programming in QT. And I want to ask is that

  1、How can I compile ffmpeg into *.lib files in windows ?

  2、Or how can I use the compiled *.dll files which are released officially in qt. Which way is better ?
  Thank you very much.

• Transcoding a video from GoToMeeting WMV to MP4 using FFMPEG on Windows locks up dos window [migrated]

  22 août 2011, par Ryan

  I've been tasked with converting some pre-recorded GoToMeeting videos from wmv to mp4 format. I've got the GoToMeeting transcoder app available from Citrix (g2mtranscoder.exe) that takes the source wmv and makes it so that ffmpeg can work with the wmv. The problem I have is when I then try and take that wmv and transcode it to mp4.

  I'm using the latest pre-compiled static version of ffmpeg for Windows from here http://ffmpeg.zeranoe.com/builds/

  Here is the command line I'm using to begin the conversion :

  "C:\ffmpeg\ffmpeg.exe" -i "999_1366_768_g2m_transcoded.wmv" -f "mp4" -b "1000k" -r "30" -ab "128k" -ar "22050" -s "1366x768" -strict "experimental" -y "999.mp4"

  Here is FFMPEG's output. The last line is where the dos window seems to stop executing/locks up (when I say lock up I mean just the dos window is locked up, not the entire machine) :

  ffmpeg version N-31932-g41bf67d, Copyright (c) 2000-2011 the FFmpeg developers built on Aug 16 2011 18:54:12 with gcc 4.6.1
  
  configuration: --enable-gpl --enable-version3 --enable-memalign-hack --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil    51. 12. 0 / 51. 12. 0
  
    libavcodec   53. 10. 0 / 53. 10. 0
  
    libavformat  53.  7. 0 / 53.  7. 0
  
    libavdevice  53.  3. 0 / 53.  3. 0
  
    libavfilter   2. 31. 1 /  2. 31. 1
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [asf @ 01BBB600] max_analyze_duration 5000000 reached at 5194000
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 59.92 (719/12)
  
  Input #0, asf, from 'D:\Inetpub\g2m\Transcoding\999_1366_768_g2m_transcoded.wmv':
  
    Metadata:
  
      WMFSDKVersion   : 10.00.00.4007
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 4403
  
      Buffer Average  : 1470
  
      WM/ToolVersion  : 4.8 Build 723
  
      WM/ToolName     : GoToMeeting
  
      BitRateFrom the writer: 1553
  
      Audio samples   : 6221
  
      Video samples   : 3455
  
      recording time  : Mon, 22 Aug 2011 11:48:42 Eastern Daylight Time
  
    Duration: 00:38:30.71, start: 0.000000, bitrate: 160 kb/s
  
      Stream #0.0: Audio: wmav2, 44100 Hz, 1 channels, s16, 48 kb/s
  
      Stream #0.1: Video: wmv3 (Main), yuv420p, 1366x768, 2154 kb/s, 59.92 tbr, 1k tbn, 1k tbc
  
  [buffer @ 01BBC120] w:1366 h:768 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  Output #0, mp4, to '\\nas4\FMS_APPLICATIONS\SVC\sk12\webinars\999.mp4':
  
    Metadata:
  
      WMFSDKVersion   : 10.00.00.4007
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 4403
  
      Buffer Average  : 1470
  
      WM/ToolVersion  : 4.8 Build 723
  
      WM/ToolName     : GoToMeeting
  
      BitRateFrom the writer: 1553
  
      Audio samples   : 6221
  
      Video samples   : 3455
  
      recording time  : Mon, 22 Aug 2011 11:48:42 Eastern Daylight Time
  
      encoder         : Lavf53.7.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 1366x768, q=2-31, 1000 kb/s, 30 tbn, 30 tbc
  
      Stream #0.1: Audio: aac, 22050 Hz, 1 channels, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press [q] to stop, [?] for help
  
  frame=  149 fps= 63 q=23.5 size=    1103kB time=00:00:04.96 bitrate=1818.6kbits/s dup=144 drop=0

  Does anyone have any idea why it's locking up the dos window and essentially failing to convert the file to mp4 ? I had a friend test it on a linux box and he was able to convert the video just fine.

  Thanks

• FFMPEG Does not work on Windows Server 2008

  25 août 2011, par Khaldoun

  I have an ASP.NET MVC Web Site ,the user can upload a video and When Done It finish uploading I show him an image extracted from the Video,
  To do this I used the FFMPEG exe to get a frame.
  Everthing works well in the developement machine , when I use the test environement it does not work !!
  I've given the read/write and execute permissions to following folders :
  1. videos(folder that store uploaded video files)
  2. thumbnails (folder that store the thumbnails of videos, captured by ffmpeg)
  3.ffmpeg.exe file at root and given read/write execute permissions to that file also.
  but it does not work.

   var _converter = new ImageConvertor(@System.Configuration.ConfigurationManager.AppSettings["FFmpegExec"].ToString());
  
              _converter.WorkingPath = Server.MapPath("~/VideoSamples");
  
              OutputPackage oo = _converter.ConvertToFLV(videoFilepath);
  
              FileStream outStream = System.IO.File.OpenWrite(Path.Combine(Server.MapPath("~/VideoSamples"), id.ToString() + ".flv"));
  
              oo.VideoStream.WriteTo(outStream);

  This Code Works on developement env but not in test env !!!
  Any Ideas Please