zita-retune - Online in the Cloud

PROGRAM:

NAME

zita-retune - resample an audio file in order to change its pitch

SYNOPSIS

zita-retune <options> <input file> <output file>.

DESCRIPTION

zita-retune resamples an audio file by a the inverse of a ratio expressed in cents,
without changing the nominal sample rate.

The result is to change the musical pitch and length of the file. Input can be any audio
file readable by the libsndfile library. The output file type is either WAV or CAF.

OPTIONS

--help Display a short help text.

--cent pitch change in cents
The number of cents by which the pitch is changed. The accepted range is +/- 1200
cents, the useful range in practice will be something like +/- 100 cents.

Output file type
--wav Produce a WAV file, or for more than 2 channels, a WAVEX file. This is the
default.

--amb Produce a WAVEX file with the Ambisonic GUID. Such files should have the .amb
filename extension.

--caf Produce a Core Audio file.

Output sample format
--16bit
Output sample format is signed 16-bit. This option also enables the use of
dithering, described below.

--24bit
Output sample format is 24-bit. This is the default.

--float
Output sample format is 32-bit floating point.

Dithering
--rec Add white dithering noise with a rectangular distribution. This is the best option
if the output data is going to processed again, but in that case it would be
advisable to use 24-bit or float.

--tri Add filtered noise with a triangular distribution. Compared to the rectangular
dither this reduces the noise density in the lower frequency range.

--lips This uses the optimal error feedback filter described by Stanley Lipschitz. This is
recommended is the output is the final distribution format, e.g. for a CD.

Timing
--pad Insert zero valued input samples at the start and end so that the output includes
the full symmetric filter response even for the first and last samples.

EXIT STATUS

Zero in case there are no errors, non-zero otherwise.

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