title: Zencoder API PHP Thumbnails
body: <p>I am using the Zencoder API PHP Library (https://github.com/zencoder/zencoder-php/blob/master/README.md) and can successfully submit single jobs for conversion. However I am struggling to get the format correct for the thumbnails.</p>
  
  <p>The required JSON for Zencoder is:</p>
  
  <pre><code>"output": [
  {
    "thumbnails": {
      "width": 800,
      "height": 600
    }
  },
  {
    "video_codec": "wmv"
  }
  ]
  </code></pre>
  
  <p>So when I submit the below through the PHP API I can get the video to work but cant work out the correct format for the thumbnails element:</p>
  
  <pre><code>"outputs" =&gt; array(
  array(                                                                                                        
  "video_codec"=&gt; "wmv"
  )
  )
  </code></pre>
  
  <p>I suspect I am missing something simple.                                    </p>