Custom post type group by meta_value

I’ve tried to solve this problem by myself since two days, but nothing worked and a thousand examples didn’t gave me the answer.

My situation is easy: I have a defined custom post type named scripts with different fields, one of them “video_number”. There are several entries with a value e.g. 70 for this “video_number”. Understandably there are many other video numbers with each a few entries. What I want to achieve is a list, grouped by the video_number.

The list should look like:

video 70
entry 4
entry 5
entry 6

video 75
entry 10
entry 11
entry 12

…

Now I don’t know how to realize this with PHP. I’ve studied the documentation of ACF, but all I achieved was a normal list of all entries.

Actualy the code looks like:

$the_query = new WP_Query(array(
	'post_type'			=> 'scripts',
	'posts_per_page'	=> -1,
	'meta_key'			=> 'video_number',
	'orderby'			=> 'meta_value_num',
	'order'				=> 'ASC'
));

?>
<?php if( $the_query->have_posts() ): ?>
	<ul>
	<?php while( $the_query->have_posts() ) : $the_query->the_post(); 

		$class = get_field('video_number');

		?>
		<li class="<?php echo $class; ?>">
			<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
		</li>
	<?php endwhile; ?>
	</ul>
<?php endif; ?>

<?php wp_reset_query();	 // Restore global post data stomped by the_post(). ?>

I know I have to implement another loop, but it seems I still have to learn many things in PHP.

I appreciate any help. Thanks!

Adriano