code: def convert_to_opus(
      src_path, dst_path, *, bitrate, compression_level
  ):
      """Convert audio file with `ffmpeg` command."""
      command = [
          "ffmpeg",
          "-y",
          "-i",
          src_path,
          "-c:a",
          "libopus",
          "-b:a",
          bitrate,
      ]
      if compression_level is not None:
          command += ["-compression_level", str(compression_level)]
      command += [dst_path]
      print(" ".join(command))
      subprocess.run(command, check=True)
  
file_path: audio/test/torchaudio_unittest/assets/io/generate_opus.py
imports: import argparse
  import subprocess
  import scipy.io.wavfile
  import torch
label_desc: Use image node_id 2 for calling a global function with example usage: convert_to_opus(src_path, dst_path) without return types