Skip to content

Instantly share code, notes, and snippets.

@jorgehatccrma
Last active June 29, 2023 14:48
Show Gist options
  • Save jorgehatccrma/24786ee7fc8158e7bd1b010d7cf34bbe to your computer and use it in GitHub Desktop.
Save jorgehatccrma/24786ee7fc8158e7bd1b010d7cf34bbe to your computer and use it in GitHub Desktop.
Recursively resample a bunch of audio files in a directory, using sox
#!/bin/bash
# A simple script to recursively resample a bunch of files
# in a directory. Only certain file extensions (mp3, aac,
# flac, wav) are considered.
#
# It takes 2 command line options: `indir` and `outdir`.
# The destination (`outdir`) is relative to the current
# directory of where you were when the script was run.
#
# Example: resample.sh audio/ resampled/
#
# The direcotry structure inside `indir` will be replicated
# in `outdir`.
# Sourece directory with files to convert
InDir=$1
# Set the directory you want for the converted files
OutDir=$2
# make sure the output directory exists (create it if not)
mkdir -p "$OutDir"
# Target sample rate
TARGET_SR=16000
# Target num channels
TARGET_NC=1
# Convert each file with SoX, and write the converted file
# to the corresponding output dir, preserving the internal
# structure of the input dir
find -E $InDir -type f -iregex '.*\.(mp3|wav|flac|aac)$' -print0 | while read -d $'\0' input
do
echo "processing" $input
# the output path, without the InDir prefix
output=${input#$InDir}
# replace the original extension with .wav
output=$OutDir${output%.*}.wav
# get the output directory, and create it if necessary
outdir=$(dirname "${output}")
mkdir -p "$outdir"
# finally, convert the file
sox "$input" -r $TARGET_SR "$output" remix 1,2
echo "saved as $output"
done
@alfredoej87
Copy link

How would you avoid problems of clipping and dithering? I undersand you need to add a -G option. Is that correct?

sox WARN rate: rate clipped 1 samples; decrease volume?
sox WARN dither: dither clipped 1 samples; decrease volume?

@ohthepain
Copy link

Thanks for the script @jorgehatccrma . It worked great first time. Now I can use my sample in my Octatrack and the BPM is preserved.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment