diff --git a/ox/api.py b/ox/api.py
index 159aec7..b784788 100644
--- a/ox/api.py
+++ b/ox/api.py
@@ -151,7 +151,8 @@ class API(object):
                     fd.write(chunk)
             shutil.move(tmpname, filename)
 
-    def upload_chunks(self, url, filename, data=None):
+
+    def upload_chunks(self, url, filename, data=None, silent=False):
         form = MultiPartForm()
         if data:
             for key in data:
@@ -188,26 +189,31 @@ class API(object):
                 try:
                     data = self._json_request(uploadUrl, form)
                 except KeyboardInterrupt:
-                    print("\ninterrupted by user.")
+                    if not slient:
+                        print("\ninterrupted by user.")
                     sys.exit(1)
                 except:
-                    print("uploading chunk failed, will try again in 5 seconds\r", end='')
+                    if not slient:
+                        print("uploading chunk failed, will try again in 5 seconds\r", end='')
                     sys.stdout.flush()
                     data = {'result': -1}
                     time.sleep(5)
                 if data and 'status' in data:
                     if data['status']['code'] == 403:
-                        print("login required")
+                        if not slient:
+                            print("login required")
                         return False
                     if data['status']['code'] != 200:
-                        print("request returned error, will try again in 5 seconds")
+                        if not slient:
+                            print("request returned error, will try again in 5 seconds")
                         if self.DEBUG:
                             print(data)
                         time.sleep(5)
                 if data and data.get('result') == 1:
                     done += len(chunk)
                     if data.get('offset') not in (None, done):
-                        print('server offset out of sync, continue from', data['offset'])
+                        if not slient:
+                            print('server offset out of sync, continue from', data['offset'])
                         done = data['offset']
                         f.seek(done)
                     chunk = f.read(CHUNK_SIZE)
diff --git a/ox/file.py b/ox/file.py
index ec9da4b..f12aee7 100644
--- a/ox/file.py
+++ b/ox/file.py
@@ -32,7 +32,8 @@ EXTENSIONS = {
         'avi', 'divx', 'dv', 'flv', 'm2t', 'm2ts', 'm4v', 'mkv', 'mov', 'mp4',
         'mpeg', 'mpg', 'mts', 'ogm', 'ogv', 'rm', 'rmvb', 'vob', 'webm', 'wmv', 'asf',
         'mod', 'tod',  # http://en.wikipedia.org/wiki/MOD_and_TOD
-        'mxf', 'ts'
+        'mxf', 'ts',
+        'dat',  # VOD files
     ],
 }