Formats¶

The format of the output file is determined by the filename extension. The following file formats are currently recognized:

wav

WAV (Microsoft)

aif

AIFF (Apple/SGI)

au

AU (Sun/NeXT)

snd

AU (Sun/NeXT)

raw

RAW (header-less)

gsm

RAW (header-less)

vox

RAW (header-less)

paf

PAF (Ensoniq PARIS, big-endian)

fap

PAF (Ensoniq PARIS, little-endian)

svx

IFF (Amiga IFF/SVX8/SV16)

nist

SPHERE (NIST SPeech HEader Resources)

sph

SPHERE (NIST SPeech HEader Resources)

voc

VOC (Creative Labs)

ircam

SF (Berkeley/IRCAM/CARL)

sf

SF (Berkeley/IRCAM/CARL)

w64

W64 (SoundFoundry WAVE 64)

mat

MAT4 (GNU Octave 2.0 / Matlab 4.2)

mat4

MAT4 (GNU Octave 2.0 / Matlab 4.2)

mat5

MAT5 (GNU Octave 2.1 / Matlab 5.0)

pvf

PVF (Portable Voice Format)

xi

XI (FastTracker 2)

htk

HTK (HMM Tool Kit)

sds

SDS (Midi Sample Dump Standard)

avr

AVR (Audio Visual Research)

wavex

WAVEX (MS WAVE with WAVEFORMATEX)

sd2

SD2 (Sound Designer II)

flac

FLAC (FLAC Lossless Audio Codec)

caf

CAF (Apple Core Audio File)

wve

WVE (Psion Series 3)

prc

WVE (Psion Series 3)

ogg

OGG (OGG Container format)

oga

OGG (OGG Container format)

mpc

MPC (Akai MPC 2k)

rf64

RF64 (RIFF 64)

Options¶

The following options are recoginzed:

-override-sample-rate=rate

Make the input use sample rate of rate Hz.

-endian=little

Make the output file use little endian data.

-endian=big

Make the output file use big endian data.

-endian=cpu

Make the output file use CPU endianness.

-normalize

Normalize the audio data in the output file.

Encodings¶

The optional encoding parameter allows setting of the data encoding for the output file. The following encodings are currently supported:

-pcms8

signed 8 bit pcm

-pcmu8

unsigned 8 bit pcm

-pcm16

16 bit pcm

-pcm24

24 bit pcm

-pcm32

32 bit pcm

-float32

32 bit floating point

-ulaw

ULAW

-alaw

ALAW

-ima-adpcm

IMA ADPCM (WAV only)

-ms-adpcm

MS ADPCM (WAV only)

-gsm610

GSM6.10 (WAV only)

-dwvw12

12 bit DWVW (AIFF only)

-dwvw16

16 bit DWVW (AIFF only)

-dwvw24

24 bit DWVW (AIFF only)

-vorbis

Vorbis (OGG only)

If no encoding is specified for the output file, sndfile-convert will try to use the encoding of the input file. This will not always work as most container formats (e.g. WAV, AIFF etc) only support a small subset of encodings (e.g. 16 bit PCM, a-law, Vorbis etc).