Mp3Encoder

Encoding an audio file to mp3

Purpose. Encodes one or more PCM audio files, writes the results as mp3 files.
Usage. 

java Mp3Encoder [ -q quality ] [ -b bitrate ] [ -V ] [ -v ] [ -s ] [ -e ] [ -t ] pcmfile ...

Parameters. 

-q quality

Quality of output mp3 file. In VBR mode, this affects the size of the mp3 file. (Default middle) One of: lowest, low, middle, high, highest.

-b bitrate

Bitrate in KBit/s. Useless in VBR mode. (Default 128) One of: 32 40 48 56 64 80 96 112 128 160 192 224 256 320 (MPEG1) Or: 8 16 24 32 40 48 56 64 80 96 112 128 144 160 (MPEG2 and MPEG2.5).

-V

VBR (variable bit rate) mode. Slower, but potentially better quality. (Default off)

-v

Be verbose.

-s

Be silent.

-e

Debugging: Dump stack trace of exceptions.

-t

Debugging: trace execution of converters.

pcmfile

the name(s) of PCM input file(s). The output file(s) will be named after the input file(s) with the extension changed to .mp3.

Bugs, limitations.  To work cleanly, this program requires JDK 1.5.0 or the latest version of Tritonus. You have to download and install the LAME mp3 encoder and the Tritonus mp3enc plug-in.

Source code here