Open Graph Video URL For Facebook - WordPress Function

gistfile1.txt

<?php
// Add video open graph metatag
add_action( 'wp_head', 'wpex_fb_video_opengraph');
function wpex_fb_video_opengraph() {
  if ( is_singular( 'post' ) ) {
		global $post;
		$output='';
		$postid = $post->ID;
		$format = get_post_format( $post_id );
		if ( $format !== 'video' ) return; // not video post format, so exit
		$video = get_post_meta( $postid, 'wpex_post_oembed', true );
		if ( $video !== '' ) {
			$output = '<meta property="og:url" content="'. $video .'" />';
		}
		return $output;
	}
}