class_docstr: A class to write an AudioClip into an audio file.
  
  Parameters
  ----------
  
  filename
    Name of any video or audio file, like ``video.mp4`` or ``sound.wav`` etc.
  
  size
    Size (width,height) in pixels of the output video.
  
  fps_input
    Frames per second of the input audio (given by the AUdioClip being
    written down).
  
  codec
    Name of the ffmpeg codec to use for the output.
  
  bitrate:
    A string indicating the bitrate of the final video. Only
    relevant for codecs which accept a bitrate.
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code: def __del__(self):
      # If the garbage collector comes, make sure the subprocess is terminated.
      self.close()
  
file_path: moviepy/moviepy/audio/io/ffmpeg_audiowriter.py
imports: import subprocess
  import proglog
  from moviepy.config import FFMPEG_BINARY
  from moviepy.decorators import requires_duration
  from moviepy.tools import cross_platform_popen_params
label_desc: Use image node_id 4 for calling the FFMPEG_AudioWriter obj's underlying member method code with example usage: obj.__del__() without return types