title: record a video with isight using ffmpeg
body: <p>So to record webcam video with ffmpeg on linux you may use something like...</p>
  
  <pre><code>ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 out.avi
  </code></pre>
  
  <p>But on a mac this doesn't work, so i was wondering how do you record with the isight with ffmpeg on a mac?</p>
  
  <p>I've researched and a lot of people said it can't be done, but most of these posts are really old so i'm wondering if it's changed since then.</p>