zresample man page

zresample — resample and change sample format of audio files

Synopsis

zresample [options] input-file output-file

Description

zresample copies an audio file, changing the sample rate and/or the sample format. For 16-bit output it can also dither the audio signal. 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.

--rate sample-rate

Set the output sample rate. Zresample uses the zita-resampler library which means that not all  combinations of input/output sample rate will be accepted. The resample ratio must be a reducable to a fraction a/b with both a and b less than or equal to 1000.

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.

Author

Fons Adriaensen (fons (at) linuxaudio.org)

Info

May 2010 version 0.0.1 USER COMMANDS