text: from os import listdir as ls
  from os.path import abspath
  from subprocess import run
  
  FFMPEG = r"C:\Another_apps\ffmpeg\bin\ffmpeg.exe"
  command = '{program} -i "{inp}" -acodec libmp3lame "{out}"'
  file_extension = '.aac'
  
  for file in ls('.'):
  	if file.endswith(file_extension):
  		file = file.replace(file_extension, '')
  		run(
  			command.format(
  				program = FFMPEG,
  				inp = abspath('./' + file + file_extension),
  				out = abspath('./' + file + '.mp3')
  			)
  		)