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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.

• How do I use ffmpeg to create an audio-synced cut from a single file ?

  1er octobre 2017, par AlaShiban

  I have 1 large file (lets call it test.mp4), and I’d like to create a new file (out.mp4) that takes 3 segments that are 1 second apart :

  Seg1: 00:01:00 - 00:02:00
Seg2: 00:03:00 - 00:04:00
Seg3: 00:06:00 - 00:07:00

  And merge them into out.mp4

  I’ve tried various concat filters, or using the textfile.txt with instructions in it :

  file file-1.wav
duration 20.0

  But various methods produce glitchy video with the x264 codec (green artifacts, choppy out-of-sync audio)

  Cutting each segment into its own file and then merging is not applicable because that approach would produce thousands of files and seems quite slow processing wise.

  Does anyone have thoughts on how this can be done properly with ffmpeg ? Is there an alternative API/CLI tool I could use thats known to work better for these cases ?

• convert videos server side using ffmpeg

  22 janvier 2015, par Edward

  Good evening,

  I am looking for a way to convert any type of video format (avi, mp4, 3gp, ogg, etc..) to .flv, I currently use flowplayer and it only supports flv

  I have installed ffmpeg onto my server just fine, the issue is, when ever I upload any video formatted (for an example an .mp4) file I get the error "could not convert video file"

  How may I fix this issue ?

  what I am trying to accomplish with this, I want to upload videos of any format have ffmpeg convert it to lets say .flv and then have the video played through flowplayer