Sutherland Boswell

You’ll need to modify your theme to not show featured images on the single post page. To do so, I recommend contacting your theme’s developer because every theme is different.

That’s odd, glad you figured out the problem. Do you mind sending me a login (hello@sutherlandboswell.com) so I can take a look at what is causing the extra space on your site?

Are you only having problems with YouTube? Can you try posting a video from another source like Vimeo to see if you have the same problem?

Are you coding the form yourself or using a plugin?

The settings page has an option to scan pages. Have you tried enabling this?

The best solution for now (I may add the option for multiple custom fields in the future) is to add some code to your theme’s functions.php file or in your own separate plugin.

If it is the same custom field multiple times, use this:

function custom_video_thumbnail_markup( $markup, $post_id ) {
	$fields = get_post_meta( $post_id, 'my_custom_field', false );
	foreach ( $fields as $field ) {
		$markup .= ' ' . $field;
	}
	return $markup;
}

add_filter( 'video_thumbnail_markup', 'custom_video_thumbnail_markup', 10, 2 );

Be sure to replace my_custom_field with the name of your custom field.

If the custom fields have different names, use this:

function custom_video_thumbnail_markup( $markup, $post_id ) {
    return get_post_meta( $post_id, 'first_custom_field', true ) . ' ' . get_post_meta( $post_id, 'second_custom_field', true );
}

add_filter( 'video_thumbnail_markup', 'custom_video_thumbnail_markup', 10, 2 );

In this case be sure to replace first_custom_field and second_custom_field with the names of your fields.

Is the video thumbnail set as the featured image as well in the admin section?