You are running your code inside of a function. Are your sure that get_the_ID() is returning the correct value in this context?
<?php if ( $query->have_posts()) : while ( $query->have_posts() ) : $query->the_post(); ?>
<div class="video-item">
<div class="video-image">
<?php
// see what get_the_ID() is returning
// make sure it's the same as the image
echo get_the_ID();
?>
<a href ="<?php echo( get_post_meta( get_the_ID(), 'video_live_url', true))?>" ><?php the_post_thumbnail(); ?></a>
also, you may need to add this line inside of your function, but I’m not sure, it’s just a guess.
global $post
