Trying to do this as well but it does not appear so.
Example:
a video I have on a Page with
ID "1015030122022040"
has a thumbnail url of:
http://vthumb.ak.fbcdn.net/hvthumb-ak-ash2/51388_10150301225830401_10150301220220401_62962_1470_t.jpg
While another video with ID: 10150361184550401
has a thumbnail url of:
http://vthumb.ak.fbcdn.net/hvthumb-ak-snc4/162098_10150361242815401_10150361184550401_35242_2053_t.jpg
I looked through others and found no obvious pattern. You can however do an FQL to return the array of videos by uid.
Using some code from a tutorial, I edited the "sql query example" in Step Three to this:
try {
//get user id
$uid = $facebook->getUser();
//or you can use $uid = $fbme['id'];
$fql = "SELECT vid, owner, title, description, thumbnail_link, embed_html, updated_time, created_time FROM video WHERE owner=" . $uid;
$param = array(
'method' => 'fql.query',
'query' => $fql,
'callback' => ''
);
$fqlResult = $facebook->api($param);
}
catch(Exception $o){
d($o);
}
Then from his example was able to the view the arrays <?php d($fqlResult); ?>
And grabbed my most recent video thumbnail thusly:
<img src="<?php echo $fqlResult[0][thumbnail_link]; ?>" />