Combining wav files programmatically - Python

Question

I am looking to combine 10 audio samples in various manners (format - wav probably, but this can be changed to any format as they will be pre-recorded).

from pydub import AudioSegment
sounds = []
sound1 = AudioSegment.from_wav("Dropbox/PIREAD/1.wav")
sound2 = AudioSegment.from_wav("Dropbox/PIREAD/2.wav")
sound3 = AudioSegment.from_wav("Dropbox/PIREAD/3.wav")
sound4 = AudioSegment.from_wav("Dropbox/PIREAD/4.wav")
sound5 = AudioSegment.from_wav("Dropbox/PIREAD/5.wav")
sound6 = AudioSegment.from_wav("Dropbox/PIREAD/6.wav")
sound7 = AudioSegment.from_wav("Dropbox/PIREAD/7.wav")
sound8 = AudioSegment.from_wav("Dropbox/PIREAD/8.wav")
sound9 = AudioSegment.from_wav("Dropbox/PIREAD/9.wav")
sound0 = AudioSegment.from_wav("Dropbox/PIREAD/0.wav")

sounds=[sound1,sound2,sound3,sound4,sound5,sound6,sound7,sound8,sound9,sound0]

combined_sounds = AudioSegment.empty()

for x in range(10):
    for y in range(10):
        combined_sounds += sounds[y]
    
combined_sounds.export("Dropbox/PIREAD/joinedFile.wav", format="wav")

This is literally me reading the numbers 0-9 and assembling them into one overall wav file.

It works - but it is slow once the loop is extended x=100, x=1000.

Q: How can I speed things up?

The actual order of the numbers will be read from a text$ - for example "354224848179261915075" which happens to be the 100th Fibonacci number.

Cheers Glen

Answer 1

Thanks for the suggestions and advice above. This is the final code I used and link to the resultant video (with ffmpeg visualisation):

# Program to display the Fibonacci sequence up to n-th term
from pydub import AudioSegment
    
combined_sounds = ""
sound1 = AudioSegment.from_wav("1_2.wav")
sound2 = AudioSegment.from_wav("2_2.wav")
sound3 = AudioSegment.from_wav("3_2.wav")
sound4 = AudioSegment.from_wav("4_2.wav")
sound5 = AudioSegment.from_wav("5_2.wav")
sound6 = AudioSegment.from_wav("6_2.wav")
sound7 = AudioSegment.from_wav("7_2.wav")
sound8 = AudioSegment.from_wav("8_2.wav")
sound9 = AudioSegment.from_wav("9_2.wav")
sound0 = AudioSegment.from_wav("0_2.wav")



nterms=1000
# first two terms
n1, n2 = 0, 1
count = 0
fib = ""

# check if the number of terms is valid
if nterms <= 0:
    print("Please enter a positive integer")
# if there is only one term, return n1
elif nterms == 1:
    print("Fibonacci sequence upto",nterms,":")
    print(n1)
# generate fibonacci sequence
else:
    print("Fibonacci sequence:")
    while count < nterms:
        #print(n1)
        fib += str(n1)
        nth = n1 + n2
       # update values
        n1 = n2
        n2 = nth
        count += 1
        
i=-36
j=0

fibs = [fib[i:i+1000] for i in range(0, len(fib), 1000)]

seg = 0
for a in fibs:
    if seg == 2:
        break
        
    combined_sounds = AudioSegment.empty()
    seg +=1
    for x in a:
        i,j = -36,0
        s = eval("sound"+str(x))    
        s = s.apply_gain_stereo(i,j)
        combined_sounds += s
        i,j = j,i
        

    combined_sounds.export("joinedFile"+str(seg)+".wav", format="wav")

This splits the output into 1000 digit wav files. The first 1000 Fibonacci terms produces nearly 15Gb of wavs!

Uploaded to YouTube: https://www.youtube.com/watch?v=U7Z_HOGqjlE

Thanks all.