Undefined index: host

The url with i tested is http://www.youtube.com/watch?v=8HBNtSVFZ_c
its an normal youtube link.

Greets Lennard

You are right eirikkk :)

The solution for that is little changed in video_embed_field_field_formatter_prepare_view
in video_embed_field.module to:

<?php
/**
*  Implementation of hook_field_formatter_prepare_view
*  Prepare the view of the video embed - if the embed code doesn't exist, create it using the url
*/
function video_embed_field_field_formatter_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items, $displays){
 $handlers = video_embed_get_handlers();
 foreach($items as $delta=>$item_wrapper){
   foreach($item_wrapper as $key=>$item){
     if(!$item['embed_code']){
       $parts = parse_url($item['video_url']);
       if(isset( $parts['host'])){
         $host = $parts['host'];
       }
       if(stripos($host, 'www.') > -1){
         $host = substr($host, 4);
       }

       if(isset($handlers[$host]['function']) && function_exists($handlers[$host]['function'])){
         $items[$delta][$key]['embed_code'] = call_user_func($handlers[$host]['function'], $item['video_url']);
       } else {
         $items[$delta][$key]['embed_code'] = l($item['video_url'], $item['video_url']);
       }
     }
   }
   
 }
}
?>

Thanks eirikkk !