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• Why I can't decode h264 stream ?

  23 avril 2015, par Zhe Chen

  I am now working on decoding h264 stream sent by a device.

  The platform I use is Android and the library I use is ffmpeg. Now I have done all the preparation including successfully registering a codec and a codeccontext, put AVCDecoderConfigurationRecord in ’extradata’ of codeccontext filling with SPS/PPS parameters.

  However, when I decode packet data using av_decode_video2, the returned value is always -1094995529 which means invalid data I found in the source code of ffmpeg. I really have no idea what’s going wrong here.

  The data stream I am dealing with forms like this :

  [0x000167...][0x000168...][0x000161...][0x000161...]......[0x000161...][0x000167...][0x000168...]...... 

  Could anyone please kindly help me with this issue ? It’s driving me crazy right now.

  I have tried parsing the 0x61 packet with av_parser_parse2 according to some others’ posts but that didn’t work.

• 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.

• use ffmpeg in php on localhost

  27 novembre 2015, par Al-Kaiser

  hi guys i want to use ffmpeg in php
  i make it when i upload a new video make a new pic.jpg and he don’t do it
  this is my code

  <?php
  
  if(isset($_POST['submit'])){
  
      if ($_FILES['episode']['error']==0){
  
          $allowed =  array('mp4','avi' ,'mkv');
  
          $cat = $_POST['cat'];
  
          $name = $_POST['name'];
  
          $desc = $_POST['desc'];
  
          $tags = $_POST['tags'];
  
          $episodes = $_FILES['episode']['name'];
  
          $extension = explode('.', $episodes);
  
          $extension = end($extension);
  
          $random_name = rand();
  
          $temp = $_FILES["episode"]["tmp_name"];
  
          $ext = pathinfo($episodes, PATHINFO_EXTENSION);
  
              if(!in_array($ext,$allowed) ) {
  
                      echo"<code class="echappe-js">&lt;script&gt;$.jGrowl('sorry, check file its video', {sticky: false, theme: 'growl-warning', header: 'Warning!' });&lt;/script&gt;
  " ;
  
                  else
  
              $file = $random_name.".".$extension ;
  
              move_uploaded_file($temp,"../files/rawmedia/".$file) ;
  
              $ffmpeg = "D :\xampp\FFMPEG\bin\ffmpeg" ;
  
              $ge = 5 ;
  
              //$siz = "120x90" ;
  
              exec(’ffmpeg -i $temp -an -ss $ge ../files/rawmedia/image1.jpg’) ;
  
              //$add = $episode->add($cat,$name,$desc,$tags,$file) ;
  
              
  
          else
  
                      echo"&lt;script&gt;$.jGrowl('please add video', {sticky: false, theme: 'growl-warning', header: 'Warning!' });&lt;/script&gt;" ;
  
           ?>
  
  
  

  my code its work but he don’t make iamge1.jpg