Extract audio from mov in Python without ffmpeg

I try to extract audio from mov file. For this purpose I do:

import pymedia, numpy as np
import pymedia.audio.acodec as acodec
import pymedia.muxer as muxer

# video: H264 - MPEG-4 AVC (part 10) (avc1), audio: PCM S16 LE (sowt)    
f = open(r'MVI_3762.mov', 'rb')     
s = f.read()

dm = muxer.Demuxer('mov')
frames = dm.parse(s) 

dec = acodec.Decoder(dm.streams[ 0 ])
...

But frames and dm.streams are empty! Any ideas?