How to simulate stereo from a mono audio file with command line or python?

Question

I'm trying to do stereo effect from a mono audio, not a copy of the mono track to another channel.

Some examples of stereoizing with Audition and Cubase 5.

Answer 1

For a nice command line audio processing toolset, look into SoX. You can write a short script to perform either of the methods shown in the two links you provided, as well as many other types of stereo processing, including impulse response convolution. Click here to download it.

Answer 2

I know the question is a bit old but since I've ended up here when searching a solution to that problem I'll write what worked for me.

SoX works perfectly and converting a mono file to stereo (by duplicating the mono signal) is as simple as:

sox mono.wav stereo.wav channels 2

Make sure you have SoX installed, mono.wav being your input file and stereo.wav here is the name given to the output file (I would not recommend trying to work inplace -- input = output -- because it doesn't seem supported)

If you need to process an entire directory, you can do something like:

for f in *.wav
do
sox "$f" "{$f%.wav}-stereo.wav" channels 2
done

Hope this helps