Twitter Player Card Validation Failing

I am attempting to set up Twitter player card metadata on my web page. I have the following markup:

<meta name="twitter:card" content="player">
<meta name="twitter:site" content="@VidyaSource">
<meta name="twitter:title" content="Nine Reasons to Try Scala - Vidya | Technology Consulting, Courses, and Online Video Tutorials">
<meta name="twitter:description" content="Video tutorial and code for developers who might want to give the Scala programming language a try.">
<meta name="twitter:creator" content="@VidyaSource">
<meta name="twitter:image" content="http://ift.tt/1cmaocp">
<meta name="twitter:url" content="http://ift.tt/1aOZFuf">
<meta name="twitter:player" content="http://ift.tt/1aOZFuf">
<meta name="twitter:player:width" content="1280">
<meta name="twitter:player:height" content="720">    
<meta name="twitter:app:name:iphone" content="YouTube">
<meta name="twitter:app:id:iphone" content="544007664">
<meta name="twitter:app:url:iphone" content="vnd.youtube://https://www.youtube.com/watch?v=rbZ6GzR8B7I&feature=applinks">    
<meta name="twitter:app:name:ipad" content="YouTube">
<meta name="twitter:app:id:ipad" content="544007664">
<meta name="twitter:app:url:ipad" content="vnd.youtube://https://www.youtube.com/watch?v=rbZ6GzR8B7I&feature=applinks">    
<meta name="twitter:app:name:googleplay" content="YouTube">
<meta name="twitter:app:id:googleplay" content="com.google.android.youtube">
<meta name="twitter:app:url:googleplay" content="http://ift.tt/1aOZFuf">

The problem is that when I run the Twitter Card Validator, I just get nothing where the video and its image should be. The title and description appear correctly on the card. The image is https:// too as the documentation suggests.

Any help on what the issue is would be appreciated.