correct default fps value to 4 instead of 5

I misinterpreted the fps I use for extracting frames with ffmpeg

itten/helpers.py

@@ -37,7 +37,7 @@ import math
 #     return hc
 
 # TODO fps muss noch implementiert werden
-def time2framenr(time, fps=5):
+def time2framenr(time, fps=4):
     """counts the frame index for a given timestamp
     
        time : timestamp needs to have the form [HH:]MM:SS

itten/movie.py

@@ -16,7 +16,7 @@ from . import helpers
 # numpy gibt beim Versuch zB. size zu schreiben auch ein AttributeError() aus.
 class Movie(object):
     """main class to interact with the colorspace of movieframes"""
-    def __init__(self, prefix, folder='./', fps=5):
+    def __init__(self, prefix, folder='./', fps=4):
         """creates an video object holding the frames of the video
         
         Arguments:
@@ -25,7 +25,7 @@ class Movie(object):
         
         Keyword Arguments:
             folder {str} -- folder containing the frames (default: {'./'})
-            fps {int} -- number of frames per second that were extracted from the movie (default: {5})  # before this were 1
+            fps {int} -- number of frames per second that were extracted from the movie (default: {4})  # before this were 1
         """
 
         self._frames = Frames(folder, prefix)