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• GDB crashes when trying to attach to ffmpeg process that is ran by ASP.NET Core app

  13 mars 2019, par Dory

  I have an ASP.NET Core app that runs on windows and activates ffmpeg_g.exe,
  I am trying to attach a gdb.exe to the ffmpeg process,
  at first, it seems to work :

  • the ffmpeg process seems paused (the video that ffmpeg produces is stopped)
  • gdb is able to read the debug symbols from ffmpeg
  • I can see all ffmpeg’s threads, and switch to the thread that I interested in.
    (using threads command and thread number)
  • I can see the backtrace (with bt command)
  • I can set breakpoints

  • but when I run continue command or step, ffmpeg crashes immediately :

    [Thread 24620.0x63c8 exited with code 4294967295]
    [Thread 24620.0x6284 exited with code 4294967295]
    [Inferior 1 (process 24620) exited with code 037777777777]

  things that are may be relevant :

  • the ffmpeg is built on Ubuntu and it does work by itself
  • I was able to attach to ffmpeg with gdb, and it works ok
    when I run ffmpeg by itself and not from the .net-core app
  • the app and the cmd window from which I run gdb, run "as administrator"
  • I tried all combinations of the app and gdb, run as administrator or regular user.
  • I use GDB that comes with mingw-w64
  • I tried to run many gdb commands to find a clue to this,
    some made only ffmpeg to crash, but, for example
    if I run info program command, it crashes both ffmpeg and GDB.

• Image path with wildcard not working when launching FFmpeg as process

  26 mai 2015, par Léon Pelletier

  In an Xamarin Android project, I’m launching FFmpeg as a process. Thus, I’m sending my parameters in a array that looks like :
  "-i", "img%d.png" ... etc

  When converting from an MP4 to images, it handles the wildcard properly. But when doing the reverse process, it complains about the img%d.png file being missing.

  Does it complains about the real file (img0.png) being missing, or is it trying to really find a file named img%d.png ?

      public Clip ConvertImagesToVideo(string imagePattern, string outPath, ShellCallback sc)
  
      {
  
          List<string> cmd = new List<string>();
  
  
  
          // ffmpeg -f image2 -i ffmpeg_temp/%05d.png -b 512 video2.mpg
  
  
  
          cmd.Add(_ffmpegBin); // ffmpeg
  
  
  
          cmd.Add("-f");
  
          cmd.Add("image2");
  
          cmd.Add("-i");
  
          cmd.Add(imagePattern);
  
  
  
          cmd.Add("-b");
  
          cmd.Add("512");
  
  
  
          Clip mediaOut = new Clip ();
  
  
  
          File fileOut = new File(outPath);
  
  
  
          mediaOut.path = fileOut.CanonicalPath;
  
  
  
          cmd.Add(mediaOut.path);
  
  
  
          execFFMPEG(cmd, sc);
  
  
  
          return mediaOut;
  
      }
  
  </string></string>

  The process is executed like so :

      private int execProcess(IList<string> cmds, ShellCallback sc, File fileExec)
  
      {
  
          ProcessBuilder pb = new ProcessBuilder(cmds);
  
          pb.Directory(fileExec);
  
  
  
          var cmdlog = new Java.Lang.StringBuilder();
  
  
  
          foreach (string cmd in cmds)
  
          {
  
              cmdlog.Append(cmd);
  
              cmdlog.Append(' ');
  
          }
  
  
  
          sc.ShellOut(cmdlog.ToString());
  
  
  
          pb.RedirectErrorStream (true);
  
  
  
          Process process = pb.Start();
  
  
  
          StreamGobbler errorGobbler = new StreamGobbler(this, process.ErrorStream, "ERROR", sc);
  
  
  
          StreamGobbler outputGobbler = new StreamGobbler(this, process.InputStream, "OUTPUT", sc);
  
  
  
          errorGobbler.run();
  
          outputGobbler.run();
  
  
  
          int exitVal = process.WaitFor();
  
  
  
          sc.ProcessComplete(exitVal);
  
  
  
          return exitVal;
  
  
  
      }
  
  </string>

  Note that I haven’t switched my code from Java.Lang to System yet so it stinks a bit. But all calls are working except this call with a wildcard. So I feel it may have to do with how Java processes are handling working directory, maybe.

• How to write a Batch/CMD file to check every 5mins if process stops then execute url ?

  10 septembre 2014, par user2068371

  So i use PHP to execute FFMPEG for video conversions and to save me manualy executing a URL to trigger the video conversions i figured it could be possible with a batch/cmd script.

  the process in question is named ffmpeg.exe

  And the url i need to execute is the following : website/index.php ?option=com_hwdmediashare&task=maintenance.process&format=raw&token=LOL

  I need to check if ffmpeg.exe is running every 5 minutes if not then execute that url or perhaps i am thinking it may be more simple to launch that url through php.exe itself.