• Установка ПО из портов

[server:~] # cd /usr/ports/audio/lame/

[server:ports/audio/lame] # make install clean
...
[server:ports/audio/lame] # cd

[server:~] # pkg install sox

[server:~] # rehash

[server:~] # fetch http://val.bmstu.ru/unix/Media/Knockin_on_Heavens_Door.mp3

root@server:~# apt install lame

root@server:~# wget http://val.bmstu.ru/unix/Media/Knockin_on_Heavens_Door.mp3

server# lame --decode Knockin_on_Heavens_Door.mp3

server# sox -V Knockin_on_Heavens_Door.wav -r 8000 -c 1 Knockin_on_Heavens_Door.raw

# sox -t al /var/lib/asterisk/sounds/custom/greeting.alaw greeting.wav

# ffmpeg -i greeting.wav -acodec libvorbis greeting.ogg

server# lame --preset voice -v -B 64 -a XYZ.wav XYZ.mp3