title: Create thumbnail from wowza stream
body: <p>I try to get thumbnail like <a href="http://www.wowza.com/forums/content.php?229-How-to-take-a-single-frame-snapshot-of-a-live-stream-for-thumbnail-creation-(ModuleCreateSnapshot)" rel="nofollow">http://www.wowza.com/forums/content.php?229-How-to-take-a-single-frame-snapshot-of-a-live-stream-for-thumbnail-creation-(ModuleCreateSnapshot)</a>
  But I get error like in last post of this forum. </p>
  
  <pre><code>[flv @ 0x7ff42380e600] Could not find codec parameters for stream 0 (Video: h264): unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  [flv @ 0x7ff42380e600] Could not find codec parameters for stream 1 (Audio: none, 0 channels): unknown codec
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  dLR.flv.flv: could not find codec parameters
  Input #0, flv, from 'dLR.flv.flv':
    Metadata:
      creationdate    : Fri Jul 17 17:03:12
    Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
      Stream #0:0: Video: h264, 1k tbr, 1k tbn, 1k tbc
      Stream #0:1: Audio: none, 0 channels
  Output #0, image2, to 'q.flv.png':
    Metadata:
      creationdate    : Fri Jul 17 17:03:12
  Output file #0 does not contain any stream
  </code></pre>