OEmbed Empty Control

You can use the rwmb_meta() function, it will auto checks whether the media player is available. If not, it shows the "Embeded HTML is not available" message.

If you want to check that your self, you can do similarly like here:

https://github.com/wpmetabox/meta-box/blob/master/inc/fields/oembed.php#L41

In the link I pasted above, there's full code to detect if the URL is a valid oembed, you can try it, like this:

$url = get_post_meta( get_the_ID(), 'oembed', true );
$args = ['width' => 640];
$embed = wp_oembed_get( $url, $args );
if ( ! $embed ) {
    $embed = $GLOBALS['wp_embed']->shortcode( $args, $url );
}
if ( $embed ) {
    echo $embed;
} else {
    // Do something when there's no controls if you want
}