diff --git a/clitools/generators/blank.py b/clitools/generators/blank.py
new file mode 100755
index 0000000..657bc5a
--- /dev/null
+++ b/clitools/generators/blank.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+# -*- mode: Python -*-
+
+
+'''
+
+Send only black points
+v0.1.0
+
+Use it to test your filters and outputs
+
+LICENCE : CC
+
+by cocoa
+
+'''
+
+from __future__ import print_function
+import time
+import argparse
+import sys
+name="generator::dummy"
+
+
+def debug(*args, **kwargs):
+    if( verbose == False ):
+        return
+    print(*args, file=sys.stderr, **kwargs)
+
+argsparser = argparse.ArgumentParser(description="dummy generator")
+argsparser.add_argument("-f","--fps",help="Frame Per Second",default=30,type=int)
+argsparser.add_argument("-v","--verbose",action="store_true",help="Verbose output")
+args        = argsparser.parse_args()
+
+fps=args.fps
+verbose=args.verbose
+optimal_looptime = 1 / fps
+debug(name+" optimal looptime "+str(optimal_looptime))
+
+
+shape = [[400,400,0],[400,400,64],[400,400,0]]
+
+
+while True:
+  start = time.time()
+  print(shape, flush=True);
+  looptime = time.time() - start
+  if( looptime < optimal_looptime ):
+    time.sleep( optimal_looptime - looptime)
+    debug(name+" micro sleep:"+str( optimal_looptime - looptime))
+
+