diff --git a/oml/media/cbr.py b/oml/media/cbr.py
index a1840a3..0c29fe2 100644
--- a/oml/media/cbr.py
+++ b/oml/media/cbr.py
@@ -1,16 +1,9 @@
 # -*- coding: utf-8 -*-
-import logging
+
+
 import os
-
 import ox
 
-logger = logging.getLogger(__name__)
-
-IMAGE_EXTENSIONS = ['.jpg', '.png', '.gif']
-
-def filter_images(files):
-    return [f for f in files if os.path.splitext(f)[-1] in IMAGE_EXTENSION]
-
 def cover(path):
     data = None
     #open rar file and extract first page here
@@ -18,7 +11,6 @@ def cover(path):
         from unrar import rarfile
         rar = rarfile.RarFile(path)
         files = rar.namelist()
-        files = filter_images(files)
         if files:
             cover = ox.sorted_strings(files)[0]
             data = rar.read(cover)
diff --git a/oml/media/cbz.py b/oml/media/cbz.py
index 0e71475..60f0672 100644
--- a/oml/media/cbz.py
+++ b/oml/media/cbz.py
@@ -1,14 +1,14 @@
 # -*- coding: utf-8 -*-
-import logging
 import os
 import zipfile
+import logging
 
 import ox
 
-from .cbr import filter_images
 
 logger = logging.getLogger(__name__)
 
+
 def cover(path):
     data = None
     logger.debug('cover %s', path)
@@ -19,9 +19,8 @@ def cover(path):
         logger.debug('invalid zbc file %s', path)
         return data
     files = [f.filename for f in z.filelist]
-    files = filter_images(files)
     if files:
-        cover = ox.sorted_strings(files)[0]
+        cover = ox.sortedstrings(files)[0]
         try:
             data = z.read(cover)
         except:
diff --git a/oml/utils.py b/oml/utils.py
index ad2b65a..c080426 100644
--- a/oml/utils.py
+++ b/oml/utils.py
@@ -424,7 +424,7 @@ def ctl_output(*args):
         p = subprocess.Popen([os.path.join(settings.base_dir, 'ctl')] + list(args),
                 stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     stdout, stderr = p.communicate()
-    #logger.debug('ctl_output%s -> %s [%s]', args, stdout, stderr)
+    logger.debug('ctl_output%s -> %s [%s]', args, stdout, stderr)
     return stdout.decode('utf-8').strip()
 
 def user_sort_key(u):