How to bulk resample audio files?

silent_move · September 4, 2020, 10:46am

Having sample from multiple sources, I struggle with the sample rate being handled differently across machines. For example, I’ve just grabbed ~200 samples from N64 games they’re at different sample rates (up to 92 kHz). Let’s say I want to use them on the Polyend Tracker which accepts only 44.1 kHz.

How can I resample audio files in bulks? By just setting a targetted sample rate. If I can have a high pass filter at 200Hz that would be gold.

chaocrator · September 4, 2020, 10:52am

on Linux, i would do it with command line and sox.
don’t know about mainstream OS.

silent_move · September 4, 2020, 10:54am

I was about to script with librosa
Which command line tool are you using?

Veets · September 4, 2020, 11:02am

Another vote for SOX.

chapelierfou · September 4, 2020, 11:05am

Using Twisted Wave which is good for applying a sequence of actions to numbers of files.

DEEPMOSES · September 4, 2020, 11:26am

Here you go:

silent_move · September 4, 2020, 11:46am

Thanks folks

d4ydream · September 4, 2020, 12:00pm

Soundforge can do batch processing and scripting.

anokah · September 4, 2020, 12:31pm

Think you can do that in audacity. Not sure, but worth checking out

Synj00 · September 4, 2020, 1:03pm

Audacity I believe can do it. It’s been a while but I’m very sure. Search google for “audacity batch conversion” also I -believe- there is scripting / tools. So say convolution reverb go from 0-100% by 10% and have 10 samples with varying degrees of convolution reverb load them up and have fun going in and out of a sonic dream.

Depending on what daw you have as well there may be scripting abilities or batch export. Like flstudio sliceX export for common use and I believe you can set the sample rate for export. Just drag a bunch in and drop down and hit go.

Also don’t forget this is a challenge that has been seen before. Maybe a windows powershell script. Depends on how quick and dirty or how deep you want to go. If you need to do it all the time with very specific needs then I’d search for a dedicated tool and that tool, depending on how elaborate it is, may cost money. Lots of ways though.

silent_move · September 4, 2020, 1:06pm

Went with SoX, very nice tool. I’ve shared the script here:

gist.github.com

https://gist.github.com/maxpv/2e4b502ab41065f66b370287e15d836e

README.md

Based on http://sox.sourceforge.net/sox.html

process.sh

#!/bin/sh 

# Will find all wav files in $source directory
# Process them and mirror the tree architecture in $output
source="N64"
output="N64-out"
mkdir -p $output

find $source -type f -name "*.wav" -print | while IFS= read -r file;
do

This file has been truncated. show original

You can easily re-adjust to your needs.

braindance · September 9, 2020, 5:34pm

sox +1

code example:

cd ~/Documents/moreDrums/

ls

mkdir converted

for file in *.wav; do sox $file -c 1 -r 48000 -b 16 converted/$(basename $file) -V; done

Reactance · September 9, 2020, 6:06pm

Rogue Amoeba’s Audio Fission tool can apparently do batch conversions. I haven’t tried it myself, but they offer a free trial: