diff --git a/lib/filelib.php b/lib/filelib.php
index a3ae1597a28..9963485f769 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -1595,22 +1595,22 @@ function mimeinfo_from_type($element, $mimetype) {
         foreach($mimeinfo as $filetype => $values) {
             if ($values['type'] == $mimetype) {
                 if ($cached[$mimetype] === null) {
-                    $cached[$mimetype] = $filetype;
+                    $cached[$mimetype] = '.'.$filetype;
                 }
                 if (!empty($values['defaulticon'])) {
-                    $cached[$mimetype] = $filetype;
+                    $cached[$mimetype] = '.'.$filetype;
                     break;
                 }
             }
         }
         if (empty($cached[$mimetype])) {
-            $cached[$mimetype] = 'xxx';
+            $cached[$mimetype] = '.xxx';
         }
     }
     if ($element === 'extension') {
         return $cached[$mimetype];
     } else {
-        return mimeinfo($element, '.'.$cached[$mimetype]);
+        return mimeinfo($element, $cached[$mimetype]);
     }
 }
 
@@ -1831,7 +1831,7 @@ function file_get_typegroup($element, $groups) {
             $mimeinfo = & get_mimetypes_array();
             $cached[$element][$group] = array();
             foreach ($mimeinfo as $extension => $value) {
-                $value['extension'] = $extension;
+                $value['extension'] = '.'.$extension;
                 if (empty($value[$element])) {
                     continue;
                 }
@@ -1859,7 +1859,7 @@ function file_get_typegroup($element, $groups) {
  */
 function file_extension_in_typegroup($filename, $groups, $checktype = false) {
     $extension = pathinfo($filename, PATHINFO_EXTENSION);
-    if (!empty($extension) && in_array(strtolower($extension), file_get_typegroup('extension', $groups))) {
+    if (!empty($extension) && in_array('.'.strtolower($extension), file_get_typegroup('extension', $groups))) {
         return true;
     }
     return $checktype && file_mimetype_in_typegroup(mimeinfo('type', $filename), $groups);
diff --git a/repository/lib.php b/repository/lib.php
index bb6c4eb4d9f..4d867fd68a6 100644
--- a/repository/lib.php
+++ b/repository/lib.php
@@ -1728,9 +1728,8 @@ abstract class repository {
                 or (is_array($accepted_types) and in_array('*', $accepted_types))) {
                 return true;
             } else {
-                $extensions = file_get_typegroup('extension', $accepted_types);
-                foreach ($extensions as $ext) {
-                    if (preg_match('#\.'.$ext.'$#i', $value['title'])) {
+                foreach ($accepted_types as $ext) {
+                    if (preg_match('#'.$ext.'$#i', $value['title'])) {
                         return true;
                     }
                 }
diff --git a/repository/upload/lib.php b/repository/upload/lib.php
index db029d17e26..4abad67fa4d 100644
--- a/repository/upload/lib.php
+++ b/repository/upload/lib.php
@@ -173,10 +173,7 @@ class repository_upload extends repository {
             // check filetype
             $filemimetype = mimeinfo('type', $_FILES[$elname]['name']);
             if (!in_array($filemimetype, $this->mimetypes)) {
-                if ($sm->string_exists($filemimetype, 'mimetypes')) {
-                    $filemimetype = get_string($filemimetype, 'mimetypes');
-                }
-                throw new moodle_exception('invalidfiletype', 'repository', '', $filemimetype);
+                throw new moodle_exception('invalidfiletype', 'repository', '', get_mimetype_description(array('filename' => $_FILES[$elname]['name'])));
             }
         }
 
diff --git a/repository/youtube/lib.php b/repository/youtube/lib.php
index 7a7c695ed5b..bc2f30461c3 100644
--- a/repository/youtube/lib.php
+++ b/repository/youtube/lib.php
@@ -111,17 +111,23 @@ class repository_youtube extends repository {
         $links = $xml->children('http://www.w3.org/2005/Atom');
         foreach ($xml->entry as $entry) {
             $media = $entry->children('http://search.yahoo.com/mrss/');
-            $title = $media->group->title;
+            $title = (string)$media->group->title;
+            $description = (string)$media->group->description;
+            if (empty($description)) {
+                $description = $title;
+            }
             $attrs = $media->group->thumbnail[2]->attributes();
             $thumbnail = $attrs['url'];
             $arr = explode('/', $entry->id);
             $id = $arr[count($arr)-1];
             $source = 'http://www.youtube.com/v/' . $id . '#' . $title;
             $list[] = array(
-                'title'=>(string)$title,
+                'shorttitle'=>$title,
+                'thumbnail_title'=>$description,
+                'title'=>$title.'.avi', // this is a hack so we accept this file by extension
                 'thumbnail'=>(string)$attrs['url'],
-                'thumbnail_width'=>150,
-                'thumbnail_height'=>120,
+                'thumbnail_width'=>(int)$attrs['width'],
+                'thumbnail_height'=>(int)$attrs['height'],
                 'size'=>'',
                 'date'=>'',
                 'source'=>$source
@@ -186,7 +192,7 @@ class repository_youtube extends repository {
      * @return array
      */
     public function supported_filetypes() {
-        return array('web_video');
+        return array('video');
     }
 
     /**