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• Saving Standard Output in memory instead of a file in C#

  19 décembre 2016, par Shawn W

  There is no online tutorial or even a book, for handling Standard Output with C#.

  I want to save standard output in a variable (memory) instead of a file in Shell Execution.

  This for storing thumbnail image from a video file with ffmpeg.

  The below is my code.

  public static void GetThumbnail(string video, string thumbnail, string ffdir)
  
  {
  
      var cmd = " -ss 00:01:00.000 -i " + '"' + video + '"' + " -vcodec rawvideo -vframes 1 -an -f rawvideo -s 320x240 pipe:1 ";
  
  
  
  
  
      var startInfo = new ProcessStartInfo
  
      {
  
          WindowStyle = ProcessWindowStyle.Normal,
  
          FileName = ffdir + "\\ffmpeg.exe ",
  
          Arguments = cmd,
  
          RedirectStandardOutput = true,
  
          UseShellExecute = false
  
      };
  
  
  
      var process = new Process
  
      {
  
          StartInfo = startInfo
  
      };
  
  
  
      process.OutputDataReceived += ProcessOnOutputDataReceived;
  
      process.ErrorDataReceived += ProcessOnOutputDataReceived;
  
  
  
      process.Start();
  
  
  
      process.WaitForExit(1000);
  
  }
  
  
  
  private static void ProcessOnOutputDataReceived(object sender, DataReceivedEventArgs dataReceivedEventArgs)
  
  {
  
      ....
  
  }

  But it does not enter to the event handler function (ProcessOnOutputDataReceived) when GetThumbnail function launched.

  Is there any clue to solve this problem ?

  I referred the question and answer here :
  getting mulitple images from a single stream piped from ffmpeg stdout

  But it does not help. It seems that the code for previous .NET versions.

• FFmpeg - Can't redirect standard output stream

  4 janvier 2017, par Ryan Vancity Gosling

  I’m running FFmpeg throught my C# application to encode an video. To try an get the progress of the video, I’ve redirected the output but there seems to be no output. I tried the same with FFProbe and it worked perfectly. Just doesn’t work for FFmpeg.

   var FFmpeg = new Process
  
          {
  
              StartInfo = new ProcessStartInfo
  
              {
  
                  FileName = Directory.GetCurrentDirectory() + "\\FFmpeg\\ffmpeg.exe",
  
                  Arguments = CurrentArgs,
  
                  UseShellExecute = false,
  
                  RedirectStandardOutput = true,
  
                  CreateNoWindow = false
  
              }
  
          };
  
          FFmpeg.Start();
  
  
  
          string line;
  
          int i = 0;
  
          while (!FFmpeg.StandardOutput.EndOfStream)
  
          {
  
              i = i + 1;
  
          }

  And the weird thing is that I have the console window enabled on my WPF project and the output is shown although there isnt any code to write it to the console. And the loop is not iterating. The FFProbe output didn’t show up on console like this.

  Can someone help me. I need to get a percentage of the FFmpeg encoding process.

• avformat : add MIDI Sample Dump Standard demuxer

  20 janvier 2017, par Paul B Mahol

  avformat : add MIDI Sample Dump Standard demuxer
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] Changelog
  • [DH] doc/general.texi
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/sdsdec.c
  • [DH] libavformat/version.h