Mixing two audio files together with python

Question

I have two wav files that I want to mix together to form one wav file. They are both the same samples format etc...

Been searching google endlessly.

I would

Answer 1

A python solution which requires both numpy and audiolab, but is fast and simple:

import numpy as np
from scikits.audiolab import wavread

data1, fs1, enc1 = wavread("file1.wav")
data2, fs2, enc2 = wavread("file2.wav")

assert fs1 == fs2
assert enc1 == enc2
result = 0.5 * data1 + 0.5 * data2

If sampling rate (fs*) or encoding (enc*) are different, you may need some audio processing (the assert are strictly speaking too strong, as wavread can handle some cases transparantly).