code: def perform_command(self):
          
          if len(self.actual_arguments) < 2:
              return self.print_help()
          input_file_path = self.actual_arguments[0]
          output_file_path = self.actual_arguments[1]
  
          if not self.check_input_file(input_file_path):
              return self.ERROR_EXIT_CODE
          if not self.check_output_file(output_file_path):
              return self.ERROR_EXIT_CODE
  
          try:
              converter = FFMPEGWrapper(rconf=self.rconf, logger=self.logger)
              converter.convert(input_file_path, output_file_path)
              self.print_success(u"Converted '%s' into '%s'" % (input_file_path, output_file_path))
              return self.NO_ERROR_EXIT_CODE
          except FFMPEGPathError:
              self.print_error(u"Unable to call the ffmpeg executable '%s'" % (self.rconf[RuntimeConfiguration.FFMPEG_PATH]))
              self.print_error(u"Make sure the path to ffmpeg is correct")
          except OSError:
              self.print_error(u"Cannot convert file '%s' into '%s'" % (input_file_path, output_file_path))
              self.print_error(u"Make sure the input file has a format supported by ffmpeg")
  
          return self.ERROR_EXIT_CODE
docs: Perform command and return the appropriate exit code.
  
          :rtype: int