CraZ7

my generator code…

[ Moderator note: please wrap code in backticks or use the code button. ]

<?php /* meta generator */
require ( ABSPATH . 'wp-admin/includes/image.php' );
$args = array(
    'post_type' => 'attachment',
    'numberposts' => -1,
    'post_status' => null,
    'post_parent' => null, // any parent
    'post_mime_type' => 'image',
    );
$attachments = get_posts($args);
$auto_incr_meta = $wpdb->get_var( 'SELECT MAX(meta_id) FROM wp_postmeta' );
$auto_incr_meta++;

if ($attachments) {

    foreach ($attachments as $post) {
            setup_postdata($post);
if(wp_get_attachment_metadata( $post->ID, false )){
//echo '1';
}else{
//echo '2';
$data = wp_generate_attachment_metadata( $post->ID, $post->guid );
	$wpdb->insert(
	'wp_postmeta',
	array(
		'meta_id' => $auto_incr_meta,
		'post_id' => $post->ID,
		'meta_key' => '_wp_attachment_metadata',
		'meta_value' => '',
	));

wp_update_attachment_metadata( $post->ID, $data );
$auto_incr_meta++;

//echo $value;
//break;
}
    }
}
?>

Dont now how good this is but it worked for me 🙂 basicly it checks all attachment(image) posts and if they dont have meta it will generate it and then add it to the postmeta table.