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• C# Start Process on Mac - FFMPEG - Exit Code 1

  3 février 2016, par Ben Hayward

  I am trying to start a process on Mac and Windows (using Unity) to run FFMPEG to convert a video to a .ogv video. My code is as follows :

      string command = "ffmpeg -i '" + filepath + "'  -codec:v libtheora -qscale:v 10 -codec:a libvorbis -qscale:a 10 -y '"+workingDir+"/ogv_Video/"+System.IO.Path.GetFileNameWithoutExtension(filepath)+".ogv'";
  
      UnityEngine.Debug.Log("Command: "+command);
  
  
  
      try{
  
  
  
          System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo (workingDir+"/..", command);
  
          startInfo.CreateNoWindow = true;
  
          startInfo.RedirectStandardOutput = true;
  
          startInfo.RedirectStandardError = true;
  
          startInfo.UseShellExecute = false;
  
          startInfo.FileName =workingDir+"/ffmpeg";
  
  
  
          //Process.Start (startInfo);
  
          Process p = Process.Start(startInfo); 
  
          p.EnableRaisingEvents = true;
  
          string strOutput = p.StandardOutput.ReadToEnd(); 
  
          UnityEngine.Debug.Log ("Running..."+strOutput);
  
          p.WaitForExit(); 
  
  
  
          UnityEngine.Debug.Log ("Got here. "+strOutput);
  
          int exitCode = p.ExitCode;
  
          UnityEngine.Debug.Log ("Process exit code = "+exitCode);
  
      }
  
      catch(Exception e) {
  
          UnityEngine.Debug.Log ("An error occurred");
  
          UnityEngine.Debug.Log ("Error: "+e);
  
      }

  The command executes and does not through any exception. However, it terminates instantly and prints Exit Code 1 which is "Catchall for general errors" -this seems not too helpful !

  What am I doing wrong with my code, please ?

  You’ll notice that my code prints out the command in full. If I copy that command and paste it into the terminal, it runs absolutely fine.

• Elegant early exit from a spawned ffmpeg process in C

  21 octobre 2016, par jackson80

  I have a program where I build an ffmpeg command string to capture videos with options input through a gtk3 gui. Once I have all my options selected, I spawn a process with the ffmpeg command string. And I add a child watch to tell me when the process has completed.

    // Spawn child process 
  
    ret = g_spawn_async (NULL, argin, NULL, G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL, &pid1, NULL);
  
    if ( !ret )
  
    {
  
      g_error ("SPAWN FAILED");
  
      return;
  
    }
  
  
  
  /* Add watch function to catch termination of the process.  This function
  
     * will clean any remnants of process */
  
    g_child_watch_add (pid1, (GChildWatchFunc)cb_child_watch, widget );

  Executing ffmpeg from a terminal using a command line, the program will give an option to input a "q" at the terminal to end the ffmpeg process early.
  Is there any way to send a "q" to that spawned process to elegantly end the ffmpeg ? I’m fairly sure I could kill the process using the process id, but I would rather stop it using a mechanism that allows ffmpeg to gracefully exit..
  This is running Centos 7, kernel 4.7.5, ffmpeg version 3.0.2.
  Since I can still access the terminal where the ffmpeg output is displayed, I’ve tried typing a "q", but it has no effect on the process.

• How to make ffmpeg exit when Input is broken

  21 décembre 2016, par APIS

  I have written a bash script to keep a ffmpeg command up and running

  #!/bin/bash
  
  while :
  
      do
  
  
  
          echo `ffmpeg -re -i http://domain.com/index400.m3u8 -vcodec copy -acodec copy -f mpegts udp://127.0.0.1:10000?pkt_size=1316`
  
  done

  The problem is, sometimes the input is broken, yet ffmpeg does not exit when that happens so that it is restarted by the above script. Instead what happens is the same process is kept running eventhough it is not transferring any packet to the UDP address (output). And I need to manually go into the terminal and kill it (kill -9 #processID)

  I need a way to make ffmpeg kill its own process whenever the input is broken.

  Appreciate your help.