<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def check_ffmpeg(cls):
 """ Check whether ``ffmpeg`` can be called. Return ``True`` on failure and ``False`` on success. :rtype: bool """

        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