Mismo código, solo se reemplazo el recurso de descarga

download-audio-only.py

import youtube_dl

ydl_opts = {
    "format":
    "bestaudio",
    "outtmpl":
    "%(title)s.%(ext)s",
    "postprocessors": [{
        "key": "FFmpegExtractAudio",
        "preferredcodec": "flac",
        "preferredquality": "192",
    }],
}
resources = [
    "https://rebrand.ly/prueba-para-25441",
]
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    x = ydl.download(resources)