code: public int getProcessExitCode()
      {
          // Make sure it's terminated
          try
          {
              ffmpeg.waitFor();
          }
          catch (InterruptedException ex)
          {
              LOG.warn("Interrupted during waiting on process, forced shutdown?", ex);
          }
          return ffmpeg.exitValue();
      }
docs: Return the exit code of the ffmpeg process
  If the process is not yet terminated, it waits for the termination
  of the process
  
  @return