Index: ammosreader/AmmosContainer.py
===================================================================
--- ammosreader/AmmosContainer.py	(revision 6d0f203c72c4b9addbb6f5ab435afc5b784aece1)
+++ ammosreader/AmmosContainer.py	(revision d62906b424075be02d6d826c7b269a6d75d629ff)
@@ -37,5 +37,8 @@
 
     def frame_sizes(self):
-        return list({each.global_frame_header.frame_length*4 for each in self.__global_frames})
+        return [each.global_frame_header.frame_length for each in self.__global_frames]
+
+    def unique_frame_sizes(self):
+        return list({each.global_frame_header.frame_length for each in self.__global_frames})
 
     def is_homogenic(self):
Index: ammosreader/AmmosGlobalFrameHeader.py
===================================================================
--- ammosreader/AmmosGlobalFrameHeader.py	(revision 6d0f203c72c4b9addbb6f5ab435afc5b784aece1)
+++ ammosreader/AmmosGlobalFrameHeader.py	(revision d62906b424075be02d6d826c7b269a6d75d629ff)
@@ -6,6 +6,7 @@
 
 
-class AmmosGlobalFrameHeader():
+class AmmosGlobalFrameHeader:
     """I implement an AMMOS global frame header."""
+
     MAGIC_WORD = "726574fb"
     HEADER_SIZE = 24
Index: sample_scripts/audio_reader.py
===================================================================
--- sample_scripts/audio_reader.py	(revision 6d0f203c72c4b9addbb6f5ab435afc5b784aece1)
+++ sample_scripts/audio_reader.py	(revision d62906b424075be02d6d826c7b269a6d75d629ff)
@@ -30,3 +30,4 @@
                                  frame_rate=22050,
                                  channels=1)
+    print("Start playing audio")
     play(data)
Index: sample_scripts/iqdw_reader.py
===================================================================
--- sample_scripts/iqdw_reader.py	(revision 6d0f203c72c4b9addbb6f5ab435afc5b784aece1)
+++ sample_scripts/iqdw_reader.py	(revision d62906b424075be02d6d826c7b269a6d75d629ff)
@@ -1,6 +1,3 @@
-#!/usr/bin/env python3
-
 import sys
-import os
 
 from ammosreader.AmmosIFReader import AmmosIFReader
@@ -20,4 +17,4 @@
     print("Frequencies", dat_file.container.frequencies())
     print("Frame types:", dat_file.container.frame_types())
-    print("Frame sizes:", dat_file.container.frame_sizes())
+    print("Total frame sizes:", sum(dat_file.container.frame_sizes()))
     print("Homogenic:", dat_file.container.is_homogenic())