Sampling rate conversion for audio using ffmpegwrapper in python
Use SoX to easily convert your files in one go. 

Here are some examples: 


https://stackoverflow.com/questions/27264156/sox-batch-process-under-debian
https://pwnetics.wordpress.com/2011/07/12/bash-one-liner-using-sox-to-batch-convert-the-sampling-frequency-of-audio-files/


Alternatively, if you want to do this from Python, use librosa. An example:

By default, librosa will resample the signal to 22050Hz.

You can change this behavior by saying:

librosa.load(audio_path, sr=44100)
to resample at 44.1KHz, or

librosa.load(audio_path, sr=None)
to disable resampling.