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You can use youtube-dl to download just the audio stream directly, no need to remux with ffmpeg.

• criddell 8y ago
  Are you happy with the audio quality with streams ripped from YouTube? I'm guessing it's been compressed more than once and that can't be good.
  • snazz 8y ago
    Using the flag shown at https://askubuntu.com/questions/423508/can-i-directly-download-audio-using-youtube-dl https://askubuntu.com/questions/423508/can-i-directly-downlo..., you can see all of the different stream qualities available (both audio and video). Some videos (particularly official music videos) have pretty good audio, while amateur videos, remixes, and parodies usually don’t sound as good.
  • jasonjayr 8y ago
    It's just as good as taping music off the radio...
  • Retr0spectrum 8y ago
    Assuming the file uploaded to youtube was high enough quality, what you get from youtube-dl has only been compressed once.