How do I mix audio files using python?

I would like to do basic audio mixing in python.

To give an example: I would like to take two mp3 files and add them together and return one mp3 file. Another example: I would like to take the first ten seconds开发者_StackOverflow社区 of one mp3 file and add it to the beginning of another mp3 file.

What is the best way to accomplish these tasks? I would like to use built in python functions like audioop but can not find any good tutorials or sample code out there for using the built in functions.

I am going through the docs but I am pretty confused and cannot figure out how to do things like this. I am not even sure that the python libraries like mp3's. Most of the stuff I have looked at seem to refer to WAV files. So, if this is the case, I guess a follow up question would be is there an easy way to convert an mp3 to a WAV for manipulation and back again?

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You can do this pretty easily using pydub:

from pydub import AudioSegment

sound1 = AudioSegment.from_mp3("/path/to/file1.mp3")
sound2 = AudioSegment.from_mp3("/path/to/file1.mp3")

# mix sound2 with sound1, starting at 5000ms into sound1)
output = sound1.overlay(sound2, position=5000)

# save the result
output.export("mixed_sounds.mp3", format="mp3")

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You could check out some of the code in the python audiotools project. It is a collection of command-line utilities which make use of a common python package. There is a utility included with audiotools (trackcat) which can con*cat*enate two or more audio tracks; another (tracksplit) can split an audio track (using a .cue file). These, as well as the numerous other included utilities, can work with audio files of various encodings, including mp3.

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The way I've done this in the past is just use subprocess. and call sox.

E.g. subprocess.call(["sox", "in.1.mp3", "in.2.mp3", "out.mp3"])