code: def video_to_audio(file_path):
      file_dir, filename_ext = os.path.split(file_path)
      output_dir = f"{str(file_dir)}_wav"
      os.makedirs(output_dir, exist_ok=True)
      filename = filename_ext.split(".")[0]
      if nlp2.is_file_exist(f"{file_dir}/{filename}.mp4"):
          in1 = ffmpeg.input(f"{file_dir}/{filename}.mp4")
          a1 = in1.audio
          out = ffmpeg.output(
              a1,
              f"{output_dir}/{filename}.wav",
              acodec="pcm_s16le",
              ac=1,
              ar="16k",
              vn=None,
          )
          out.run()
  
imports: import argparse
  import os
  import ffmpeg
  import nlp2
  from tqdm import tqdm
  from tqdm.contrib.concurrent import process_map
label_desc: Use image node_id 1 for calling a global function with example usage: video_to_audio(file_path) without return types