assign_metadata.py

from yt_dlp import YoutubeDL
from mutagen.easymp4 import EasyMP4
import os

ydl = YoutubeDL()
# List files
files = os.listdir()

# Filter out non-m4a files
files = [f for f in files if f.endswith(".m4a")]

for file in files:
    yt_id = file.split(".")[0]
    # Get metadata

    info = ydl.extract_info(yt_id, download=False)

    m4a = EasyMP4(file)
    m4a["title"] = info.get("title")
    m4a["artist"] = (
        info.get("uploader") or info.get("channel") or info.get("uploader_id")
    )
    m4a.save()