old_contents: """
  
  """
  import logging
  
  converter_logger = logging.getLogger("pydub.converter")
  
  def log_conversion(conversion_command):
      converter_logger.debug(u"subprocess.call({0})".format(repr(conversion_command)))
new_contents: """
  
  """
  import logging
  
  converter_logger = logging.getLogger("pydub.converter")
  
  def log_conversion(conversion_command):
      converter_logger.debug("subprocess.call(%s)", repr(conversion_command))
subject: fix ffmpeg debug logging