Multi-threaded python script to convert all flac files to mp3 V0 while keeping the directory structure

flac2mp3_V0.py

import os
from shutil import copyfile
import pathlib
from multiprocessing import Pool, Value

SRC = "/mnt/Data1/Music"
DST = "/mnt/Data1/Music [V0]"

to_convert = []
counter = Value("d")


def convert(path):
    global counter
    destination = DST + path[len(SRC):]
    destination = os.path.splitext(destination)[0] + ".mp3"

    pathlib.Path(os.path.split(destination)[0]).mkdir(parents=True, exist_ok=True)

    if not os.path.exists(destination):
        os.system("ffmpeg -i \"" + path + "\" -c:a libmp3lame -q:a 0 -y \"" + destination + "\" -loglevel panic")
        print("[%.2f%%] - " % (counter.value / len(to_convert) * 100) + destination)
    counter.value += 1


def recursive_convert(path):

    for item in os.listdir(path):
        full_path = path + os.sep + item
        if os.path.isdir(full_path):
            recursive_convert(full_path)
        else:
            if os.path.splitext(item)[1] in [".mp3", ".flac", ".m4a", ".ape"]:
                to_convert.append(full_path)


recursive_convert(SRC)
print("Converting " + str(len(to_convert)) + " files...")

pool = Pool(processes=4)
pool.map(convert, to_convert)