CongBom

To get meta value in front-end, use <code>get_post_meta()</code> with meta key is <code>youtube_id</code>.
Example:
Print YouTube video ID: 
 ID, ‘youtube_id’, true);?>
Thumbnails: 
 <img src="http://img.youtube.com/vi/ID, ‘youtube_id’, true);?>/mqdefault.jpg” alt=”” />
Video player:
<iframe src="http://www.youtube.com/embed/ID, ‘youtube_id’, true); ?>” width=”588″ height=”331″ frameborder=”0″ allowfullscreen>

YouTube metabox

Create YouTube meta-box for post with live preview

Bill Erickson

NOTE: This uses the old media gallery interface, and I have no plans to change this.
I use the WordPress Gallery a lot on websites I build. It’s a wonderful tool, but it’s hard to find. Instead of telling users “Click the first icon next to Upload/Insert, then click the gallery tab”, I created this simple plugin to display all the attached images in a metabox.
It’s also customizable for developers (see documentation).
<a href="https://github.com/billerickson/Gallery-Metabox/wiki" rel="nofollow ugc">Documentation</a>
No support will be provided by the developer

Gallery Metabox

After updating to WP v4.9 this plugin gave me a PHP error until I added an image and then deleted it. Something about an array expected. Needs attention.


Throws a PHP error

Displays all the post's attached images on the Edit screen.

YouTube metabox vs Gallery Metabox