title: ERROR: audio conversion failed: Unknown encoder 'libmp3lame'
body: <p>I'm trying to use youtube-dl on a Macbook (using Mojave). It used to work flawlessly but recently I am seeing the following error:</p>
  
  <pre><code>youtube-dl -x --audio-format mp3 https://youtu.be/somevidR4hhU
  [youtube] somevidR4hhU: Downloading webpage
  [youtube] somevidR4hhU: Downloading video info webpage
  [youtube] somevidR4hhU: Downloading js player vflWnjS_n
  [download] Destination: somevidR4hhU.webm
  [download] 100% of 4.60MiB in 00:04
  [ffmpeg] Destination: somevidR4hhU.mp3
  ERROR: audio conversion failed: Unknown encoder 'libmp3lame'
  </code></pre>
  
  <p>I've tried to reinstall youtube-dl and lame with:</p>
  
  <pre><code>brew reinstall youtube-dl lame
  </code></pre>
  
  <p>but it makes no difference. Any idea what the problem may be?
  Thanks in advance!</p>