Input format is any file readable by libsndfile, output is either WAV
 (WAVEX for more than 2 channels) or CAF. Apart from resampling, users
 can change the sample format to 16-bit, 24-bit or float, and for 16-bit
 output, add dithering.
 .
 Available dithering types are rectangular, triangular and Lipschitz'
 optimised error feedback filter. Some examples of dithering can be seen
 here:
 https://kokkinizita.linuxaudio.org/linuxaudio/dithering.html