wavfiles

dd skip=47 count=79773 if=original/the_message.wav of=message_image_encoded.png bs=1
 Write this into script.py:
 import sys
 data = sys.stdin.read()
 for i in range(0, len(data)):
         if (i % 2) == 0:
                 sys.stdout.write(data[i])
 sys.stdout.flush()
 Then run "cat  message_image_encoded.png | python script.py > image_decoded.png"