<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}
// Add custom js to prevent input on video version field
function linde_video_js() {
    echo '<script>
      var version = document.querySelector("#video_version_field");
      if(version){
        version.querySelector("input").setAttribute("readonly", "true");
      }
    </script>';
};
add_action('admin_footer', 'linde_video_js');
?>