How do display JWPlayer shortcode from custom meta box

jwplayer_metabox.php

<?php 
/* 
* The JW Player plugin drops shortcode into the editor. It's not filtered through WordPress's do_shortcode().
* You need to use jwplayer_tag_callback().
*/
global $post;
if (get_post_meta($post->ID, '_cmb_mini_wysiwyg', true) ): 
    $myvid = get_post_meta($post->ID, '_cmb_mini_wysiwyg', true);
    $myvid = jwplayer_tag_callback( $myvid );
    echo $myvid;
endif; 
?>