Audio files are a widespread means of transferring information. So let’s see how to work with audio files using Python. Python provides a module called pydub to work with audio files. pydub is a Python library to work with only .wav files. By using this library we can play, split, merge, edit our .wav audio files.
Installation
This module does not come built-in with Python. To install it type the below command in the terminal.
pip install pydub
Following are some functionalities that can be performed by pydub:
- Playing audio file.
- We can get certain information of file like length channels.
- Increase/Decrease volume of given .wav file.
- Merging two or more audio files.
- Exporting an audio file.
- Splitting an audio file.
Let’s see the code for some functionalities of pydub library:
1) Playing Audio File: This is done using play() method.
# import required libraries from pydub import AudioSegment
from pydub.playback import play
# Import an audio file # Format parameter only # for readability wav_file = AudioSegment.from_file( file = "Sample.wav" ,
format = "wav" )
# Play the audio file play(wav_file) |
Output:
2) Knowing about .wav file: for this we will use attributes of audio file object.
# import required library from pydub import AudioSegment
# import the audio file wav_file = AudioSegment.from_file( file = "Sample.wav" , format = "wav" )
# data type for the file print ( type (wav_file))
# OUTPUT: <class 'pydub.audio_segment.AudioSegment'> # To find frame rate of song/file print (wav_file.frame_rate)
# OUTPUT: 22050 # To know about channels of file print (wav_file.channels)
# OUTPUT: 1 # Find the number of bytes per sample print (wav_file.sample_width )
# OUTPUT : 2 # Find Maximum amplitude print (wav_file. max )
# OUTPUT 17106 # To know length of audio file print ( len (wav_file))
# OUTPUT 60000 ''' We can change the attributes of file by changeed_audio_segment = audio_segment.set_ATTRIBUTENAME(x) ''' wav_file_new = wav_file.set_frame_rate( 50 )
print (wav_file_new.frame_rate)
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Output:
<class 'pydub.audio_segment.AudioSegment'> 22050 1 2 17106 60000 50
3) Increasing/Decreasing volume of the file: By using ‘+’ and ‘-‘ operator.
# import required library import pydub
from pydub.playback import play
wav_file = pydub.AudioSegment.from_file( file = "Sample.wav" ,
format = "wav" )
# Increase the volume by 10 dB new_wav_file = wav_file + 10 # Reducing volume by 5 silent_wav_file = wav_file - 5
# Playing silent file play(silent_wav_file) # Playing original file play(wav_file) # Playing louder file play(new_wav_file) # Feel the difference! |
Output:
4) Merging files: This is done using ‘+’ operator.
# import required libraries from pydub import AudioSegment
from pydub.playback import play
wav_file_1 = AudioSegment.from_file( "noice.wav" )
wav_file_2 = AudioSegment.from_file( "Sample.wav" )
# Combine the two audio files wav_file_3 = wav_file_1 + wav_file_2
# play the sound play(wav_file_3) |
Output:
5) Exporting files: This is done using export() method.
# import library from pydub import AudioSegment
# Import audio file wav_file = AudioSegment.from_file( "Sample.wav" )
''' You can do anything like remixing and export
I'm increasing volume just for sake of my simplicity
Increase by 10 decibels
''' louder_wav_file = wav_file + 10 # Export louder audio file louder_wav_file.export(out_f = "louder_wav_file.wav" ,
format = "wav" )
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Output:
6) Splitting Audio: Splitting audio using split_to_mono() method.
# import required libraries from pydub import AudioSegment
from pydub.playback import play
# importing audio file a = AudioSegment.from_file( "pzm12.wav" )
# Split stereo to mono b = a.split_to_mono()
print (b)
print (b[ 0 ].channels )
b[ 0 ].export(out_f = "outNow.wav" , format = "wav" )
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Output:
[<pydub.audio_segment.AudioSegment object at 0x000001358727E860>, <pydub.audio_segment.AudioSegment object at 0x000001358721F978>] 1