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• Only 1 process is showing activity parallel foreach

  18 janvier 2018, par TheHappyGuy

  So I am using a Parallel.Foreach because I want to start 4 unique processes that does essentially the same thing. Watermarks a video.

  How it should work is that it should open 4 ffmpeg.exe and pass an argument to each window so it watermarks 4 videos at a time.
  However.. That’s not what is happening, It opens 4 processes but only 1 is active. Not sure if it’s trying to use the same one 4 times or what ever it could be but I need help.

  When I close the working process, the 3 non working ones are still there until I manually close them down.
  Here is a visual representation

  

  Here is a second image showing what happends when closing the working one

  

  Here is the code :

  public void Watermark()
  
      {
  
          Console.WriteLine("Please enter the directory with the mp4 files: ");
  
          string EntryPath = Console.ReadLine();
  
  
  
          //Console.WriteLine("Please enter the directory with the mp4 files: ");
  
          //string OutputPath = Console.ReadLine();
  
  
  
          var psi = new ProcessStartInfo();
  
          psi.WindowStyle = ProcessWindowStyle.Hidden;
  
          psi.FileName = "ffmpeg.exe";
  
          int i = 0;
  
  
  
          var videos = Directory.EnumerateFiles(EntryPath, "*.mp4");
  
          Parallel.ForEach(videos, new ParallelOptions { MaxDegreeOfParallelism = 4 },
  
              vid =>
  
              {
  
                  try
  
                  {
  
                      //Maybe those processes are trying to work on the same file and can't access it?
  
                      //It's probably better to use the event Exited than WaitForExit
  
                      psi.Arguments = $"-i {vid} -i watermarker.png -threads 4 -filter_complex \"overlay = 275:350\" C:\\Users\\Developer\\Desktop\\Eh\\Watermarked{i}.mp4";
  
                      var p = Process.Start(psi);
  
                      p.WaitForExit();
  
  
  
                      Console.WriteLine($"{vid} is watermarked");
  
                      i++;
  
                  }
  
                  catch (Exception)
  
                  {
  
                      Console.ForegroundColor = ConsoleColor.Red;
  
                      Console.WriteLine("Error parsing that file");
  
                      Console.ForegroundColor = ConsoleColor.White;
  
                  }
  
  
  
              });
  
          Console.ReadLine();
  
  
  
      }

• Difference between DirectShowSource() and FFmpegSource2() in AviSynth

  29 mars 2024, par MarianD

  For non .avi A/V sources (as .mp3, .mp4, etc.) there are (at least) 2 possibilities for reading those media files in AviSynth (in Windows) :

  



  

  • The built-in media filter DirectShowSource(), using Microsoft's DirectShow media architecture.

  


  • The AviSynth Plugin FFmpegSource2() alias FFMS2() using FFmpeg and nothing else.

  


  



  What are advantages and disadvantages of them ?
  
Which is more reliable, frame / sample accurate, etc.?

  


• tests/checkasm/float_dsp : Increase allowed difference for float_dsp.vector_dmul

  29 octobre 2017, par Michael Niedermayer

  tests/checkasm/float_dsp : Increase allowed difference for float_dsp.vector_dmul
  Tested for 10000 iterations on x86-32
  Fixes : Ticket6848
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] tests/checkasm/float_dsp.c