libsamplerate

Library for high-quality audio sample rate conversion

brewmacoslinux

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Library for sample rate conversion of audio data

sndfile-resample

Convert audio file from 44.1kHz to 48kHz$ sndfile-resample -to 48000 input.wav output.wav

Resample with best quality (high converter type)$ sndfile-resample -to 48000 -c 2 input.wav output.wav

Display available converter types and usage info$ sndfile-resample -h