script to convert .flac files to .opus

convert.py

#!/usr/bin/env python3

import os
from multiprocessing import Pool, cpu_count
from pathlib import Path
import subprocess

REMOVE = True
BITRATE = "144"
EXTENSIONS = [ ".flac" ]

def main():
    to_convert = dir_tree("./")

    workers = max(1, cpu_count() - 1)
    with Pool(workers) as pool:
        pool.map(convert, to_convert)

def is_convertable(file_name: str) -> bool:
    return Path(file_name).suffix in EXTENSIONS

def dir_tree(root_path: str):
    to_convert: list[Path] = []

    for root, _, files in os.walk(root_path):
        to_convert += [
            Path(os.path.join(root, file))
            for file in files
            if is_convertable(file)
        ]

    return to_convert


def convert(file: Path):
    print(f"Processing {file.stem}")
    folder = file.parent.absolute().as_posix()
    new_file = f"{folder}/{file.stem}.opus"
    subprocess.run(["opusenc", "--bitrate", f"{BITRATE}", "--quiet", file, new_file])

    if REMOVE:
        file.unlink()

if __name__ == '__main__':
    main()