code: def check_ffmpeg(cls):
          
          try:
              from aeneas.ffmpegwrapper import FFMPEGWrapper
              input_file_path = gf.absolute_path(u"tools/res/audio.mp3", __file__)
              handler, output_file_path = gf.tmp_file(suffix=u".wav")
              converter = FFMPEGWrapper()
              result = converter.convert(input_file_path, output_file_path)
              gf.delete_file(handler, output_file_path)
              if result:
                  gf.print_success(u"ffmpeg         OK")
                  return False
          except:
              pass
          gf.print_error(u"ffmpeg         ERROR")
          gf.print_info(u"  Please make sure you have ffmpeg installed correctly")
          gf.print_info(u"  and that its path is in your PATH environment variable")
          return True
docs: Check whether ``ffmpeg`` can be called.
  
          Return ``True`` on failure and ``False`` on success.
  
          :rtype: bool