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• Container does not reflect MediaReader setting

  8 mars 2014, par Mondain

  I would like my reader to be able to handle audio, when it does not start with the video ; hence the setting of "AddDynamicStreams". How do I get the container to recognize the setting of the reader from which it originated ? Is there a flag or some other property that I need to set ?

  String inputUrl = "rtmp://127.0.0.1:1935/myapp/mystream live=1 buffer=1";
  
  IMediaReader reader = ToolFactory.makeReader(inputUrl);
  
  reader.setCloseOnEofOnly(false);
  
  reader.setQueryMetaData(false);
  
  // we want dynamic addition of streams
  
  reader.setAddDynamicStreams(true);
  
  // this shows "true"
  
  log.debug("Reader can dynamically add streams: {}", reader.canAddDynamicStreams());
  
  // get the container
  
  IContainer container = reader.getContainer();
  
  // this shows "false"
  
  log.debug("Container can dynamically add streams: {}", container.canStreamsBeAddedDynamically());

• Securely using the PHP exec function

  19 janvier 2012, par siberiantiger

  I am writing a PHP script designed to run an executable file (ffmpeg.exe) via the exec() function. The problem is that I have read that using the exec() function can be a security risk and should be avoided if possible. I have been doing some research into how to run the exec() function securely, and the only thing that I keep coming across is to filter the command string with escapeshellcmd or escapeshellarg. What I want to know is if it is possible to further increase security when using the exec() function or if there is a secure alternative to exec(). Any help would be appreciated.

  Here is my code ;

  define('FFMPEG_LIBRARY', 'c:\\ffmpeg7\\ffmpeg\\bin\\ffmpeg ');
  
  $transcode_string = FFMPEG_LIBRARY." -i " . $srcFile . " -acodec libmp3lame -ab 64k -ar 22050 -ac 1 -vcodec libx264 -b:v 250k -r 30 -f flv -y " . $destFile;
  
  $transcode_string = escapeshellcmd($transcode_string);
  
  exec($transcode_string);

  $srcFile is basically the video for transcoding while $destFile is the output file I wish to create.

• Catch if the Java proccess crashed

  17 janvier 2012, par VSheyanov

  I run java process to convert video using ffmpeg.exe.

  Runtime rt = Runtime.getRuntime();
  
  String cmd = FFMPEGFULLPATH + " -y -i " + '"' + mpeg4File + '"' + " -vcodec libx264 -vsync 2 " + '"' + H264file + '"';
  
  
  
  Process pr = rt.exec(cmd);
  
  
  
  ThreadedTranscoderIO errorHandler = new ThreadedTranscoderIO(pr.getErrorStream(), "Error Stream");
  
  errorHandler.start();
  
  ThreadedTranscoderIO inputHandler = new ThreadedTranscoderIO(pr.getInputStream(), "Output Stream");
  
  inputHandler.start();
  
  
  
  try {
  
        pr.waitFor();
  
  } catch (InterruptedException e) {
  
        LiveApplication.logger.info("Some shit happens during convertation 2 ");
  
        throw new IOException("UseTranscoderBlocking - Run_FFMPEG - process interrupted " + e);                  
  
  }

  But when the process started, sometimes especially with big files, but not always i get this windows message :

  

  This happens only on Windows server 2008 and didn't happened on Windows 7.

  I have 2 questions :

  1. Why this process fails ?
  2. Can I catch this fail in Java, close
     this window and continue thread execution (maybe I'll restart this
     proccess).

  Thanks !