How to split a .wav file into multiple .wav files?

Question

I have a .wav file several minutes long that I would like to split into different 10 second .wav files.

This is my python code so far:

import wave
import math

def main(filename, time):
    read = wave.open(filename, 'r')

#get sample rate
    frameRate = read.getframerate()

#get number of frames
    numFrames = read.getnframes()

#get duration
    duration = numFrames/frameRate

#get all frames as a string of bytes
    frames = read.readframes(numFrames)

#get 1 frame as a string of bytes
    oneFrame = read.readframes(1)

#framerate*time == numframesneeded
    numFramesNeeded=frameRate*time

#numFramesNeeded*oneFrame=numBytes
    numBytes = numFramesNeeded*oneFrame

#splice frames to get a list strings each representing a 'time' length
#wav file
    x=0
    wavList=[]
    while x+time<=duration:
        curFrame= frames[x:x+time]
        x=x+time
        wavList.append(curFrame)

Printing wavList yields:

['x00x00x00x00xffxffx00x00x00x00', 'x00x00x00x00x00x00x00x00x00x00', 'x00x00x00x00x00x00x00x00x00x00', 'x00x00x00x00x00x00x00x00x00x00', 'x00x00x00x00x00x00x00x00x00x00']

I know that this is a list of frames. How do I make one wav file for each element in this list (the first .wav file would be 'x00x00x00x00xffxffx00x00x00x00'? Python’s wave module is unclear about using frames to create .wav files.

EDIT: This is a duplicate question of How to splice an audio file (wav format) into 1 sec splices in python?
However, if someone has an answer that does not require pydub I would very much like to see it.

Asked By: jdsto

||

Source

Answer 1

This is a python code snippet that I use for splitting files as per necessity.
I use the pydub library from https://github.com/jiaaro/pydub.
You can modify the snippet to suit your requirement.

from pydub import AudioSegment
t1 = t1 * 1000 #Works in milliseconds
t2 = t2 * 1000
newAudio = AudioSegment.from_wav("oldSong.wav")
newAudio = newAudio[t1:t2]
newAudio.export('newSong.wav', format="wav") #Exports to a wav file in the current path.

Answered By: siddhantsomani

Answer 2

I’ve written a class to simplify the whole process.
Although it’s for wav files.

Here it is:

from pydub import AudioSegment
import math

class SplitWavAudioMubin():
    def __init__(self, folder, filename):
        self.folder = folder
        self.filename = filename
        self.filepath = folder + '\' + filename
        
        self.audio = AudioSegment.from_wav(self.filepath)
    
    def get_duration(self):
        return self.audio.duration_seconds
    
    def single_split(self, from_min, to_min, split_filename):
        t1 = from_min * 60 * 1000
        t2 = to_min * 60 * 1000
        split_audio = self.audio[t1:t2]
        split_audio.export(self.folder + '\' + split_filename, format="wav")
        
    def multiple_split(self, min_per_split):
        total_mins = math.ceil(self.get_duration() / 60)
        for i in range(0, total_mins, min_per_split):
            split_fn = str(i) + '_' + self.filename
            self.single_split(i, i+min_per_split, split_fn)
            print(str(i) + ' Done')
            if i == total_mins - min_per_split:
                print('All splited successfully')

Usage

folder = 'F:\My Audios\Khaled'
file = 'Khaled Speech.wav'
split_wav = SplitWavAudioMubin(folder, file)
split_wav.multiple_split(min_per_split=1)

That’s it! It will split the single wav file into multiple wav files with 1 minute duration each. The last split audio may have less than 1-minute duration 😉

Note: If you’re in Mac/Linux, then change \ to /

Answered By: Shariful Islam Mubin

Answer 3

For those that come seeking an answer strictly for the wave module.

import wave

# times between which to extract the wave from
start = 5.2 # seconds
end = 78.3 # seconds

# file to extract the snippet from
with wave.open('my_in_file.wav', "rb") as infile:
    # get file data
    nchannels = infile.getnchannels()
    sampwidth = infile.getsampwidth()
    framerate = infile.getframerate()
    # set position in wave to start of segment
    infile.setpos(int(start * framerate))
    # extract data
    data = infile.readframes(int((end - start) * framerate))

# write the extracted data to a new file
with wave.open('my_out_file.wav', 'w') as outfile:
    outfile.setnchannels(nchannels)
    outfile.setsampwidth(sampwidth)
    outfile.setframerate(framerate)
    outfile.setnframes(int(len(data) / sampwidth))
    outfile.writeframes(data)

Answered By: Lachlan

How to split a .wav file into multiple .wav files?

Question:

Answers: