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• C# ffmpeg not working

  24 février 2018, par ViVi

  I am trying to convert an mp3 file into a flac file using ffmpeg for c#.
  I downloaded the ffmpeg.exe and placed it inside the bin/debug folder of my project.

  My input folder is testmp3 and output folder is testmp3OUTPUT. These folders are located within the debug folder itself. testmp3 folder got mp3 files.

  This is the code I am using :

  string inputfile = @"..\\testmp3\\349.mp3";
  
  string outputfile = @"..\\testmp3OUTPUT\\349.flac";
  
  Process myProcess = new Process();
  
  ProcessStartInfo p = new ProcessStartInfo();
  
  string sArgs = string.Format(" -i {0} -f wav - | neroAacEnc -ignorelength -q 0.5 -if - -of {1}", inputfile, outputfile);
  
  p.FileName = "ffmpeg.exe";
  
  p.CreateNoWindow = true;
  
  p.RedirectStandardOutput = true;
  
  //p.WindowStyle = ProcessWindowStyle.Normal
  
  p.UseShellExecute = false;
  
  p.Arguments = sArgs;
  
  myProcess.StartInfo = p;
  
  myProcess.Start();
  
  myProcess.WaitForExit();
  
  //Write details about call 
  
  myProcess.StandardOutput.ReadToEnd();

• opencv codecs not found or not working on windows

  5 janvier 2016, par fbence

  I’m using opencv3.0 with python3.4. The program runs as expected on linux.

  The following line gives me an error :

  self.vWriter_independent = cv2.VideoWriter(output + "_independent.avi", cv2.VideoWriter_fourcc('X','2','6','4'), framerate, self.frameSizeOW, True)
  
  
  
  
  
  Could not find encoder for codec id 28: Encoder not found

  If I use -1 instead of the FOURCC I can choose vfw x264 codec by hand, but it also creates empty videos. I tried downloading openh264.dll and placing it beside the opencv_ffmpeg300.dll-s, but still no luck. I also tried deleting the ffmpeg dll-s, but no luck there either.

  Does anybody have any idea, what could be the issue ?

• ffmpeg frame rate per second (fps) not working ? [migrated]

  7 février 2014, par plancherel

  I'm generating .png files and then creating a movie of them. The command that I'm using is :

  ffmpeg -r fps -i im%d.png -y movie.mp4

  This command works fine when fps = 1,6 or 10. However, it fails when fps=2.

  It builds and mp4 file ; however, the images are not displayed. Before anyone asks, yes, I'm generating the right number of .png files before each ffmpeg call. For example, if my movie should be 9 seconds long at 10 fps then I have 90 png files. When my movie is 2 fps, then I have 18 image files.

  Could someone please help me ?

  Also, I did try this and it didn't work either

  ffmpeg -r fps -i im%d.png -r 18/9 -y movie.mp4