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• StackOverflowException with Process in C#

  4 juin 2015, par user3633222

  I have a process, which runs in a console app. It runs forever.

  After a couple of days the app crashes with a StackOverflowException.

  The essence of the app is where I spin up a Process with FFMpeg.exe and creates a sceenshot of a video stream. It works very good but only for a few days at the time.

  I am pretty sure it has to do with the disposal of the FFMpeg or some internal Process stuff.

  Here is the code

  using ( Process ffmpegProcess = new Process() ) {
  
  
  
      //arguments for running ffmpeg
  
      ffmpegProcess.StartInfo.UseShellExecute = false;
  
      ffmpegProcess.StartInfo.CreateNoWindow = true;
  
      ffmpegProcess.StartInfo.RedirectStandardOutput = true;
  
  
  
      //specific for our screenshots
  
      ffmpegProcess.StartInfo.FileName = string.Concat( Environment.CurrentDirectory, Path.DirectorySeparatorChar, ffmpegProgramName );
  
  
  
      try {
  
          //todo: log this stopwatch somewhere perhaps
  
          processWatch.Start();
  
  
  
          //set arguments every time we want to create a new screen shot
  
          ffmpegProcess.StartInfo.Arguments = string.Format( @"-y -i {0}{1} -threads 0 -ss 00:00:01.000 -f image2 -s 620x349 -vframes 1 ../../web/{2}.jpg", server, streamPath, slug );
  
          ffmpegProcess.Start();
  
          ffmpegProcess.WaitForExit( 500 );
  
  
  
          Console.WriteLine( slug );
  
          Console.WriteLine( processWatch.Elapsed );
  
  
  
          processWatch.Reset();
  
          runCount++;
  
          cacheIndexer++;
  
  
  
          //lets see how many spins we've had!
  
          Console.WriteLine( string.Format( "SERVER CACHE INDEX : {0}", cacheIndexer ) );
  
          Console.WriteLine( string.Format( "RUN : {0}", runCount ) );
  
          Console.WriteLine( Environment.NewLine );
  
  
  
      } catch ( Exception ex ) {
  
          //Console.WriteLine( "Ex " + ex );
  
      }
  
  }

  The loop looks like this.

      public void RecurseTask() {
  
          /*
  
          You can try one of these, but you will se CPU usage go crazy and perhaps concurrency errors due IO blocking
  
  
  
          Parallel.ForEach( _videoStreamSlugs, ( e ) => _videoStreamScreenShots.GrabScreenShot( e ) );
  
  
  
          foreach ( var slug in _videoStreamSlugs ) {
  
              Task.Run( () => _videoStreamScreenShots.GrabScreenShot( slug ) );
  
          }
  
          */
  
  
  
          //we want to grab screen shots for every slug in out slug list!
  
          foreach ( var slug in _videoStreamSlugs ) {
  
              _videoStreamScreenShots.GrabScreenShot( slug );
  
          }
  
  
  
          //sleep for a little while
  
          Thread.Sleep( _recurseInterval );
  
  
  
          //A heavy clean up!
  
          //We do this, trying to avoid a stackoverflow excecption in the recursive method
  
          //Please inspect this if problems arise
  
          GC.Collect();
  
  
  
          //lets grab over again
  
          RecurseTask();
  
      }

  I added a GC.Collect out of curiosity to see if it made a difference.

  I am not doing a Windows Service.

• Pass both resolve and reject callbacks to the process pipe.

  24 avril 2013, par blueimp

  m js/jquery.fileupload.js
  

  Pass both resolve and reject callbacks to the process pipe.

• 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.