Notice: Undefined index: action

This happened with my theme after I’ve updated WP to the latest version.
The url is : http://www.movie-galaxy.com

Notice: Undefined index: video_width in /home1/djandrei/public_html/movie-galaxy.com/wp-content/themes/DarkTheme/functions.php on line 507

Notice: Undefined index: video_height in /home1/djandrei/public_html/movie-galaxy.com/wp-content/themes/DarkTheme/functions.php on line 508

Warning: Cannot modify header information – headers already sent by (output started at /home1/djandrei/public_html/movie-galaxy.com/wp-content/themes/DarkTheme/functions.php:507) in /home1/djandrei/public_html/movie-galaxy.com/wp-admin/post.php on line 2

add_action('publish_post', 'ys_video_add_post_meta');
function ys_video_add_post_meta($post_ID) {
    global $wpdb;
    update_post_meta($post_ID, '_video_portal', $_POST["video_portal"]);
    update_post_meta($post_ID, '_video_id', $_POST["video_id"]);
    update_post_meta($post_ID, '_video_width', $_POST["video_width"]);  
    update_post_meta($post_ID, '_video_height', $_POST["video_height"]);
    update_post_meta($post_ID, '_video_thumbnail', $_POST["video_thumbnail"]);
    update_post_meta($post_ID, '_video_thumbnail_small', $_POST["video_thumbnail_small"]);
    update_post_meta($post_ID, '_movie_featured', $_POST["movie_featured"]);
    update_post_meta($post_ID, '_video_dvd_downurl', $_POST["video_dvd_downurl"]);

    update_post_meta($post_ID, '_featured_prcture', $_POST["featured_prcture"]);
    update_post_meta($post_ID, '_featured_prcture_small', $_POST["featured_prcture_small"]);

    update_post_meta($post_ID, '_flv_url', $_POST["flv_url"]);
}