diff --git a/Python Version/pymosh/codec/mpeg4.py b/Python Version/pymosh/codec/mpeg4.py
deleted file mode 100644
index 3e4952d..0000000
--- a/Python Version/pymosh/codec/mpeg4.py	
+++ /dev/null
@@ -1,6 +0,0 @@
-IFRAME_HEADER = b'\x00\x00\x01\xb0'
-
-
-def is_iframe(frame):
-    """Determine whether frame is an I frame."""
-    return frame[:4] == IFRAME_HEADER