title: Unknown encoder 'libfaac'
body: <p>I'm using <a href="https://github.com/rheaton/carrierwave-video" rel="noreferrer">carrierwave-video</a> to upload video with my ruby on rails app. But I have this problem when try encode the video:</p>
  
  <pre><code>Unknown encoder 'libfaac'
  
  Errors: no output file created.
  </code></pre>
  
  <p>I have tried with:</p>
  
  <pre><code>sudo apt-get install libfaac-dev
  </code></pre>
  
  <p>but I get the same error.</p>
  
  <p><strong>Updated</strong>:</p>
  
  <p>After compile ffmpeg, I get the same error:</p>
  
  <pre><code>Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp42isomavc1
      creation_time   : 2011-10-13 18:54:50
      encoder         : HandBrake 0.9.5 2011010300
    Duration: 00:06:43.28, start: 0.000000, bitrate: 380 kb/s
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x600 [SAR 1:1 DAR 8:5], 279 kb/s, 9.25 fps, 25 tbr, 90k tbn, 180k tbc
      Metadata:
        creation_time   : 2011-10-13 18:54:50
        handler_name    : 
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, s16, 97 kb/s
      Metadata:
        creation_time   : 2011-10-13 18:54:50
        handler_name    : 
  Please use -q:a or -q:v, -qscale is ambiguous
  Unknown encoder 'libfaac'
  
  Errors: no output file created. 
  </code></pre>