Many of the following features override the encoder's
idea of best-quality settings. You should be aware that overriding the encoder
default settings is something for experts. You might wreack the encoding quality
in a number of ways without first noticing it. Also, the encoder is not guaranteed
to run at all parameter combinations. Proceed at your own risk!
- -k
- Tells the encoder to use full bandwidth. By default, the encoder uses a
16kHz bandwidth up to 64kbps per channel, and full bandwidth at higher bitrates.
Increasing the bandwidth from the default setting might produces ringing artefacts
at low bitrates. Use with care!
- -O
- Uses the original ISO psycho-acoustic model instead of GPsycho. Used with
-m s, it will produce the same output as the ISO code or the encoders
based on it, like 8Hz, Blade or Lame 2.x
It will reduce a lot the quality and should only be used for comparison tests.
-
- -a
- This switch tells the encoder to autoconvert a stereo input signal into
one channel, producing mono output. The downmix is calculated as the sum of
the left and right channel, attenuated by 6 dB.
- -f
- This switch forces the encoder to use the "extra fast" encoding
mode. It will reduce a lot the quality of the output. This might be useful
for real-time processing or streaming on slowest computers.