title: Certificate Verification Failure for youtube-dl
body: <p>I am trying to get the audio from a YouTube video, using the command:</p>
  
  <pre><code>youtube-dl --extract-audio --audio-format mp3 [video link]
  </code></pre>
  
  <p>Each time I try to run this command in Terminal on macOS (High Sierra v10.13.2), it gives me this error:</p>
  
  <pre><code>ERROR: Unable to download webpage: &lt;urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)&gt; (caused by URLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)'),))
  </code></pre>
  
  <p>Note: I have youtube-dl installed, and also have Python 2.7 and Python 3.6 (if that helps)</p>
  
  <p>If anyone can help me resolve that issue, that would be great.</p>