title: ffmpeg: Unable to find a suitable output format, libfaac
body: <p>I just downloaded "FFmpeg git-070b0e1 32-bit Static (Latest)" from <a href="http://ffmpeg.zeranoe.com/builds/">http://ffmpeg.zeranoe.com/builds/</a>. I extracted the files on my Vista machine and then updated my PATH to point to <code>presets</code> and <code>bin</code> folders.</p>
  
  <p>The first command I ran was this:</p>
  
  <pre><code>ffmpeg -i C:/a.avi  -vcodec libtheora  -qscale 6  -acodec libvorbis  -ab 128k  -vf scale="480:-1"   C:/a.ogv
  </code></pre>
  
  <p>I got this error:</p>
  
  <pre><code>Please use -q:a or -q:v, -qscale is ambiguous
  [NULL @ 0200F800] Unable to find a suitable output format for 'C:/a.ogv''
  C:/a.ogv': Invalid argument
  </code></pre>
  
  <p>The second command I ran was this:</p>
  
  <pre><code>ffmpeg -i C:/a.avi  -vcodec libx264  -preset slow  -profile main  -crf 20  -acodec libfaac  -ab 128k  -vf scale="480:-1"   C:/a.mp4
  </code></pre>
  
  <p>I got this error: <code>Unknown encoder 'libfaac'</code></p>
  
  <p><strong>Questions:</strong></p>
  
  <ol>
  <li><p>I'm trying to convert an input video (I don't know what the MIME type is) and output it as ogv and mp4 so I can play it on a website. Of course, I'm looking for highest possible quality at the lowest possible file size. I've pieced my commands from what I can find on the net. Am I on the right track? What can I do to improve?</p>
  
  <ol>
  <li>Any ideas how to address the errors I'm getting?</li>
  </ol></li>
  </ol>