sox Sound eXchange : universal sound sample translator

터미널에서 음악 파일을 변환하는 방법

wav 파일을 raw 파일로 변환 (8000Hz 모노로)

sox -V input.wav -r 8000 -c 1 -s output.raw

옵션 

-v|--volume FACTOR             Input file volume adjustment factor (real number)

--ignore-length                        Ignore input file length given in header; read to EOF

-t|--type FILETYPE                 File type of audio

-s/-u/-f/-U/-A/-i/-a/-g                 Encoding type=signed-integer/unsigned-integer/floating point/mu-law/a-law/ima-adpcm/ms-adpcm/gsm-full-rate

-e|--encoding ENCODING    Set encoding (ENCODING in above list)

-b|--bits BITS                           Encoded sample size in bits

-1/-2/-3/-4/-8                             Encoded sample size in bytes

-N|--reverse-nibbles               Encoded nibble-order

-X|--reverse-bits                      Encoded bit-order

--endian little|big|swap          Encoded byte-order; swap means opposite to default

-L/-B/-x                                      Short options for the above

-c|--channels CHANNELS    Number of channels of audio data; e.g. 2 = stereo

-r|--rate RATE                          Sample rate of audio

-C|--compression FACTOR  Compression factor for output format

--add-comment TEXT            Append output file comment

--comment TEXT                    Specify comment text for the output file

--comment-file FILENAME    File containing comment text for the output file

--no-glob                                  Don't `glob' wildcard match the following filename