I just tested this on my site with that image you provided and it worked for me, I cannot replicate this issue. Here’s my test post –
https://stevemortiboy.com/videos/test-video-post/
view-source:https://stevemortiboy.com/videos/test-video-post/
Here’s the OG meta in the source code of that post –
<meta property=”og:title” content=”This is my test video post OG title” />
<meta property=”og:type” content=”article” />
<meta property=”og:url” content=”https://stevemortiboy.com/videos/test-video-post/” />
<meta property=”og:image” content=”https://img.youtube.com/vi/DLFZyTJM71o/0.jpg” />
<meta property=”og:site_name” content=”My Test Site” />
<meta property=”og:description” content=”This is my test video post OG description” />
<meta property=”article:publisher” content=”https://www.facebook.com/semperfiwebdesign” />
<meta property=”article:published_time” content=”2014-08-01T18:00:31Z” />
<meta property=”article:modified_time” content=”2015-02-10T10:32:08Z” />
<meta name=”twitter:card” content=”summary_large_image” />
<meta name=”twitter:site” content=”@wpsmort” />
<meta name=”twitter:domain” content=”stevemortiboy.com” />
<meta name=”twitter:description” content=”This is my test video post OG description” />
<meta itemprop=”image” content=”https://img.youtube.com/vi/DLFZyTJM71o/0.jpg” />
I tested this post with Twitter’s card validator and they picked up the OG meta just fine – https://tinypic.com/view.php?pic=5bpaqd&s=8#.VNolZFPeynQ
I see that on your site, the og:image and meta image aren’t being output at all. I also see you’ve configured the og:type to Website when it should be Article although this doesn’t affect the output of the og:image.
This could be a misconfiguration of the plugin, in which case please send me screenshots of all the settings under All in One SEO, Social Meta and all the settings on the Social Settings tab of that post and we can check them.