Basic command line switch reference

switch	parameter
--abr	average bitrate encoding
-b	bitrate (8...320)
--decode	decoding only
-f	fast mode
-h	high quality
--help	help
-m m	mono mode
-V	VBR quality setting (0...9)

* --abr n    average bitrate encoding

Turns on encoding with a targeted average bitrate of n kbits, allowing to use frames of different sizes. The allowed range of n is 8-320, you can use any integer value within that range.

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* -b n    bitrate

For MPEG1 (sampling frequencies of 32, 44.1 and 48 kHz)
n = 32,40,48,56,64,80,96,112,128,160,192,224,256,320

For MPEG2 (sampling frequencies of 16, 22.05 and 24 kHz)
n = 8,16,24,32,40,48,56,64,80,96,112,128,144,160

Default is 128 kbs for MPEG1 and 80 kbs for MPEG2.

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* --decode    decoding only

Uses LAME for decoding to a WAV file. The input file can be any input type supported by encoding, including layer I,II,III (MP3).

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* -f    fast mode

This switch forces the encoder to use a faster encoding mode, but with a lower quality.

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* -h    high quality

Use some quality improvements. Encoding will be slower, but the result will be of higher quality.
This switch is always enabled when using VBR.

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* --help    help

Display a list of all available options.

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* -m m    mono mode

The input will be encoded as a mono signal.

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* -V 0...9    VBR quality setting

Enable VBR (Variable BitRate) and specifies the value of VBR quality.
default=4
0=highest quality.