decode to wav
avconv -i input.m4a output.wav
for f in *.m4a; do avconv -i "$f" "${f/%m4a/wav}"; done
faad -o output.wav input.aac
sox -t raw -r 8000 -A -b 8 -c 1 file.alaw file.wav
sox -t raw -r 8000 -U -b 8 -c 1 file.mulaw test.wav
decode from wav
sox file.wav -t raw -r 8000 -c 1 -b 8 -U file.mulaw
sox file.wav -t raw -r 8000 -c 1 -b 8 -A file.alaw
cut
sox test.wav 60secs.wav --show-progress trim 0 01:00
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