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• libavfilter : vf_drawbox filter support draw box with detection bounding boxes in...

  14 mai 2021, par Ting Fu

  libavfilter : vf_drawbox filter support draw box with detection bounding boxes in side_data
  This feature can be used with dnn detection by setting vf_drawbox's
  
  option box_source=side_data_detection_bboxes, for example :
  
  ./ffmpeg -i face.jpeg -vf dnn_detect=dnn_backend=openvino:model=face-detection-adas-0001.xml :\
  
  input=data:output=detection_out:labels=face-detection-adas-0001.label,\
  
  drawbox=box_source=side_data_detection_bboxes -y face_detect.jpeg
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_drawbox.c

• Can I dynamically call a LGPL/GPL software in my closed-source application ? [closed]

  29 juin 2016, par marcgg

  I want to use a tool (ffmpeg) that is under GNU Lesser General Public License, version 2.1 GNU General Public License (GPL) version 2 for some components.

  To do so, I only call it in my software as such :

  System.Diagnostics.Process p = new System.Diagnostics.Process();
  
  p.StartInfo = new System.Diagnostics.ProcessStartInfo("lgplSoftware.exe", myParams);
  
  p.Start();

  I do not change it, I only use a built version of the software for windows.

  ---

  Wikipedia says :

  A key dispute related to the GPL is
  whether or not non-GPL software can be
  dynamically linked to GPL libraries.
  The GPL is clear in requiring that all
  derivative works of code under the GPL
  must themselves be under the GPL.
  While it is understood that static
  linking produces derivative works, it
  is not clear whether an executable
  that dynamically links to a GPL code
  should be considered a derivative work
  (see Weak Copyleft). The
  free/open-source software community is
  split on this issue. The FSF asserts
  that such an executable is indeed a
  derivative work if the executable and
  GPL code "make function calls to each
  other and share data structures,"
  with certain others agreeing (e.g.
  Jerry Epplin), while some (e.g.
  Linus Torvalds) agree that dynamic
  linking can create derived works but
  disagree over the circumstances.

  ---

  I am really confused by all this legal things. I would have made my project LGPL as well and released the source, but this is not up to me.

  So the question is : can I use it like I’m doing right now or will I be executed by an army of lawyers ?

• How to convert all types (audio*) to mp3 ? Using FFMPEG

  9 mars 2017, par Matheus Miranda

  It is possible to convert all audio to mp3 ?

  System.Diagnostics.Process proc = new System.Diagnostics.Process();
  
                      proc.EnableRaisingEvents = false;
  
                      proc.StartInfo.FileName = @"""C:\ffmpeg\bin\ffmpeg.exe""";
  
                      proc.StartInfo.Arguments = "-i C:\\Matheus\\Matheus_Project\\Matheus_Project\\App_Data\\" + User.Identity.Name + "\\" + fileNameAndType + " -acodec libmp3lame -ab 128k C:\\Matheus\\Matheus_Project\\Matheus_Project\\App_Data\\" + User.Identity.Name + "\\" + fileName + ".mp3";  /* use /y to overwrite if there it exists already or will fail */
  
                      proc.StartInfo.UseShellExecute = false;
  
                      proc.StartInfo.CreateNoWindow = false;
  
                      proc.StartInfo.RedirectStandardOutput = true;
  
                      proc.StartInfo.RedirectStandardError = true;
  
                      proc.Start();
  
  
  
                      var output = proc.StandardOutput.ReadToEnd();
  
                      string output_error = proc.StandardError.ReadToEnd();
  
  
  
                      proc.WaitForExit();
  
                      proc.Close();

  Example :

  • audio/x-m4a to mp3

  • audio/mp4 to mp3

  • audio/basic to mp3

  • audio/L24 to mp3

  • audio/mid to mp3

  • audio/x-aiff to mp3

  • audio/x-mpegurl to mp3

  • audio/vnd.rn-realaudio to mp3

  • audio/ogg to mp3

  • audio/vorbis to mp3

  • audio/vnd.wav to mp3

  Any idea ?