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Isn't YouTube bestaudio already Opus?

• jerf 5y ago
  Often yes, but it'll be much higher quality than 12Kb/s. But 12Kb/s is plenty for human speech to be comprehensible, though you'll generally notice the quality loss. Plus, I haven't studied this but I don't think they reencode all old content. New videos seems consistent but older videos can have varying things available. Using bestaudio & ffmpeg will definitely get you a consistent result. I can't promise hard-coded -f options for specific formats will be reliable.
  • Dylan16807 5y ago
    Also, Opus is actually two codecs. You'll only see CELT, the general purpose codec, from about 32kbps and up. But at super low bitrates it uses SILK, a speech codec. At 12kbps you'd very probably see the hybrid mode, where SILK does the bulk of the work but CELT handles frequencies above 8kHz. So youtube is already Opus, but it's not already SILK.
• andai 5y ago
  Yeah, my main intention was to save bandwidth, so I used just about the lowest possible bitrate and the best codec to match :)