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• C# Process output redirected to console instead of stream

  18 juillet 2017, par w0ffen

  I am trying to use FFmpeg to get video data using the following code :

  var ffmpeg = new Process();
  
          ProcessStartInfo sInfo = new ProcessStartInfo();
  
  
  
          sInfo.FileName = @"C:\FFmpeg\ffmpeg.exe";
  
          sInfo.Arguments = string.Format("-i {0}", filePath);
  
          sInfo.UseShellExecute = false;
  
          sInfo.RedirectStandardOutput = true;
  
  
  
          ffmpeg.StartInfo = sInfo;
  
          ffmpeg.Start();
  
  
  
          string output = ffmpeg.StandardOutput.ReadToEnd();
  
  
  
          ffmpeg.WaitForExit();

  The process output goes through, but it is a console application, and the output gets redirected to the console window. Then, when I check the contents of output, it is empty, but ffmpeg’s output is displayed on the console window of the program I’m working on.

  How do I fix this ?

• javacv records the camera stream，the console prints warning all the time

  5 septembre 2017, par dtest

  When javacv records the camera stream, the following warning statement appears. The function is normal, but the console prints all the time. Is there any solution ?

  [swscaler @ 000000002b8cd2a0] deprecated pixel format used, make sure you  did set range correctly
  
  [swscaler @ 00000000342a4d80] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 00000000339f3920] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0000000030a29060] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002be31d60] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002bb06260] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0000000039c5af60] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 00000000342a4d80] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 00000000339f3920] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002b8cd2a0] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0000000039c5af60] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002b8cd2a0] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0000000030a29060] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0000000030a29060] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002be31d60] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002bb06260] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 000000002be31d60] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0000000039c5af60] deprecated pixel format used, make sure you did set range correctly

• How can i use ffmpeg to capture the entire desktop but without the console window of the ffmpeg ? [duplicate]

  1er novembre 2017, par Simonicop cooper

  This question already has an answer here :

  • Launching process in C# Without Distracting Console Window
    
    4 answers
    

  This is how i’m doing it in the command prompt :

  ffmpeg -f gdigrab -framerate 24 -i desktop -preset ultrafast -pix_fmt yuv420p out.mp4

  And in csharp code :

  using System;  
  
  using System.Collections.Generic;  
  
  using System.Linq;  
  
  using System.Text;  
  
  using System.Threading.Tasks;  
  
  using System.IO;  
  
  using System.Diagnostics;  
  
  
  
  namespace Ffmpeg_App  
  
  {  
  
      class Ffmpeg  
  
      {  
  
          Process process;  
  
  
  
          public void Start(string FileName, int Framerate)  
  
          {  
  
              process = new System.Diagnostics.Process();  
  
              process.StartInfo.FileName = @"D:\ffmpegx86\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
  
              process.EnableRaisingEvents = false;  
  
              process.StartInfo.WorkingDirectory = @"D:\ffmpegx86"; // The output directory  
  
              process.StartInfo.Arguments = @"-f gdigrab -framerate " + Framerate + " -i desktop -preset ultrafast -                                                                     pix_fmt yuv420p " + FileName;  
  
              process.Start();  
  
              process.StartInfo.UseShellExecute = false;  
  
              process.StartInfo.CreateNoWindow = false;  
  
              Close();  
  
          }  
  
  
  
          public void Close()  
  
          {  
  
              process.Close();  
  
          }  
  
      }  
  
  }  

  In form1 top :

  Ffmpeg fpeg = new Ffmpeg();

  Start button :

  private void Start_Click(object sender, EventArgs e)  
  
          {  
  
              fpeg.Start("test.mp4", 24);  
  
          }  

  Stop button :

  private void Stop_Click(object sender, EventArgs e)  
  
          {  
  
              fpeg.Close();  
  
          } 

  The problem is when i start recording it also recording first few seconds the console window of the ffmpeg too same when i stop the recording.

  How can i make in both cases using only command prompt or using with csharp that it will not show the console window of the ffmpeg ?

  Ffmpeg console window