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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.

SEE ALSO

       Some     examples     of     dithering     are     available      here:
       http://www.kokkinizita.net/linuxaudio/dithering.php

AUTHOR

       zita-retune was written by Fons Adriaensen <fons@kokkinizita.net>.

       This  manual  page  was written by Jaromír Mikeš <mira.mikes@seznam.cz>
       for the Debian project (but may be used by others).

                                September 2012                  ZITA-RETUNE(1)



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