Recherche avancée

Sur d’autres sites (5487)

• 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.

• Redirect output from ffmeg to openssl

  23 janvier 2017, par Ahmed Mkadem

  I’m using ubuntu and I’m trying to record a video using ffmpeg and encrypt it with AES using openssl.I want to begin the encryption and the record in parallel (bytes coming from ffmeg redirected to openssl to be encrypted and obtain at the end an encrypted video) but I have no idea how to do this, can pipelines help in this case ?

• ffmpeg batch convert from working Linux code to Windows

  30 mai 2016, par iisac

  I have this code on my Linux :

  for i in ./*.mkv; do \
  
  ffmpeg -i "$i" -c:v libvpx-vp9 -pass 1 -b:v 5M -threads 8 -speed 4 \
  
    -tile-columns 6 -frame-parallel 1 \
  
    -an -y -f webm /mnt/TemppiKovo/HEVC_perseily && \
  
  
  
  ffmpeg -i "$i" -c:v libvpx-vp9 -pass 2 -pix_fmt yuv420p -b:v 5M -threads 8 -speed 1 \
  
    -tile-columns 6 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 \
  
    -c:a libopus -b:a 320k -f webm "${i%.mkv}-VP9.webm"
  
  
  
  done

  How do I do exactly the same on Windows ?