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• Revision 6522 : $GLOBALS[’liste_des_forums’] a disparu

  12 juin 2012, par kent1 — Log

  $GLOBALSliste_des_forums ? a disparu

• ffmpeg generate overlay complex filter for audio with background image

  8 janvier 2016, par user1793606

  I am experimenting with ffmpeg and would like to generate overlay complex filter for audio with background image. The code normally works, except for when adding -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a
  it crashes. I found the example code at https://trac.ffmpeg.org/wiki/Waveform Any help is appreciated.

  Command '['c:/ffmpeg/bin\\ffmpeg.exe', '-y', '-loop', '1', '-r', '1', '-i', 'temp\\bg.png', '-i', 'test.mp3', '-filter_complex', '[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]', '-map', '[v]', '-map', '0:a', '-c:v', 'libx264', '-preset', 'ultrafast', '-tune', 'stillimage', '-crf', '15', '-pix_fmt', 'yuv420p', '-strict', 'experimental', '-c:a', 'aac', '-b:a', '256k', '-shortest', '-threads', '0', 'done/test.mp4']'

  EDIT 1 :

  I tested this with the new verson : ffmpeg -y -i input.mp3 -i background.png -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a -c:v libx264 -c:a copy output.mp4

  It generates an output file, but only the waveform, no background included. My end goal is to generate the waveform over the background.

• ffmpeg from a C# app using Process class - user prompt not shown in standardError

  21 avril 2016, par DarwinIcesurfer

  I am writing an app to run ffmpeg using c#. My program redirects the standardError output to a stream so it can be parsed for progress information.

  During testing I have found a problem :

  If the output is shown in a command window rather than being redirected ffmpeg will display it’s normal headers followed by "file c :\temp\testfile.mpg already exists. overwrite [y]". If I click on the command window and press y the program continues to encode the file.

  If the StandardError is redirected to my handler and then printed to the console, I see the same header information that was displayed in the command window now printed to the console. except for the file...already exists prompt. If I click in the command window and press y the program continues to process the file.

  Is there a stream other than standardOutput or standardError that is used when the operator is prompted for information, or am I missing something else ?

  public void EncodeVideoWithProgress(string filename, string arguments, BackgroundWorker worker, DoWorkEventArgs e)
  
      {
  
  
  
          Process proc = new Process();
  
  
  
          proc.StartInfo.FileName = "ffmpeg";
  
          proc.StartInfo.Arguments = "-i " + " \"" + filename + "\" " + arguments;
  
  
  
          proc.StartInfo.UseShellExecute = false;
  
          proc.EnableRaisingEvents = true;
  
  
  
          proc.StartInfo.RedirectStandardError = true;
  
          proc.StartInfo.RedirectStandardOutput = false;
  
          proc.StartInfo.CreateNoWindow = false; //set to true for testing
  
  
  
          proc.ErrorDataReceived += new DataReceivedEventHandler(NetErrorDataHandler);
  
  
  
          proc.Start();
  
          proc.BeginErrorReadLine();
  
  
  
  
  
          StreamReader reader = proc.StandardOutput;
  
           string line;
  
           while ((line = reader.ReadLine()) != null)
  
          { Console.WriteLine(line); }
  
       proc.WaitForExit();
  
  }
  
  
  
  private static void NetErrorDataHandler(object sendingProcess,
  
                 DataReceivedEventArgs errLine)
  
      {
  
          if (!String.IsNullOrEmpty(errLine.Data))
  
          {
  
              Console.WriteLine(errLine.Data);
  
          }
  
      }