title: Objects of this type do not allow properties named 'og:video:release_date'?
body: <p>The page I'm working on generates the following Open Graph tags. Using Facebook debugger I got the following errors (note that I changed the real values here) :</p>
  
  <p>Extraneous Property:    Objects of this type do not allow properties named 'og:video:release_date'.
  Extraneous Property:    Objects of this type do not allow properties named 'og:video:director'.
  Extraneous Property:    Objects of this type do not allow properties named 'og:video:actor'.
  Extraneous Property:    Objects of this type do not allow properties named 'fb:page_id'.</p>
  
  <pre><code>&lt;meta property="og:title" content="Title of the movie" /&gt;
  &lt;meta property="og:type" content="video.movie" /&gt;
  &lt;meta property="og:video:release_date" content="2012-03-03" /&gt;
  &lt;meta property="og:video:director" content="Emmanuel Mouret" /&gt;
  &lt;meta property="og:video:actor" content="Emmanuel Mouret, Julie Depardieu, Francois Cluzet, Pascale Arbillot" /&gt;        
  &lt;meta property="og:image" content="http://somesite.com/images/image.jpg" /&gt;
  &lt;meta property="og:url" content="http://somesite.com/premieres/movie-title" /&gt;
  &lt;meta property="og:video:url" content="http://somesite.com/videos/trailers/movie-title.mp4" /&gt;
  &lt;meta property="og:description" content="lorem ipsum [...]" /&gt;
  &lt;meta property="og:locale" content="en_EN" /&gt;
  &lt;meta property="og:site_name" content="Some Site" /&gt;
  &lt;meta property="fb:page_id" content="23342324452342" /&gt;
  &lt;meta property="fb:admins" content="232323232" /&gt;
  </code></pre>
  
  <p>I don't understand why the video properties are not allowed, I guess eveything is echoed properly, using the correct date format and so on.</p>
  
  <p>Also, is there a maximum image size Facebook can handle? It looks that some of images doesn't render in the debugger though the url of the JPG is there, and I can only assume that they are too large: 2500x4000px?</p>
  
  <p>Thanks.</p>