asterisk-sounds-convert

mp3 to wav

lame --decode file.mp3 - | sox -v 0.5 -t wav - -t wav -b 16 -r 8000 -c 1 file.wav

wav to mp3

lame -V2 input.wav output.mp3

gsm to wav

sox input.gsm -r 8000 -c 1 -w -s ouput.wav

wav to gsm

sox input.wav -r 8000 -c 1 -t gsm output.gsm

bulk

#!/bin/bash

for f in *.mp3; do
    lame --decode $f - | sox -v 0.5 -t wav - -t wav -b 16 -r 8000 -c 1 $(basename -s .mp3 $f).wav
done

wav to g722

http://wiki.innovaphone.com/index.php?title=Howto:Convert_wave_files_in_to_G722_coder_files

wav to opus

/usr/bin/ffmpeg -i sound.wav -acodec libopus -ar 8000 -ab 8000 sound.ogg

opus to wav

opusdec --force-wav sound.ogg sound.wav

wav repair

sox -t raw -r 8000 -b 16 -c 1 -L -e signed-integer broken.wav fixed.wav

when record to wav was broken