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• ffmpeg installation on linux server

  7 juin 2015, par Aisha

  I was facing issues in converting files using ffmpeg there were errors coming like Unknown encoder ’lipvpx’ ’libopus’etc. I put the issue on stackoverflow people suggested me installing latest version of ffmpeg and rebuilding the libraries. i have 0.10.0 version of ffmpeg. I tried to reinstall from this link

  https://trac.ffmpeg.org/wiki/CompilationGuide/Centos

  but i am getting different errors during installation like

  :git clone git://github.com/project.git
  
   github.com[0: 207.97.227.239]: errno=Connection refused
  
   fatal: unable to connect a socket (Connection refused)

  i tried using https, it gets installed but when i tried to install ffmpeg and enable libraries but its showing an error like libfdk_aac not found, libopus not found, libmp3lame not found although i installed all of them first but still i am lost.

  I have wasted my two days on this issue. Please help

  Thanks

• 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.

• StackOverflowException with Process

  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 );
  
                      }
  
                  }