Appendix > Appendix D - TwoLame encoder command line

TwoLame encoder, used during the development of this product, is available for download from the following link.

TwoLame encoder latest build, with full source code, is available for download from its owner's website

Below you can find the full list of command line's options for TwoLame version 0.3.12b:

TwoLAME version TwoLame 0.3.12b (http://www.twolame.org)

MPEG Audio Layer II (MP2) encoder

Usage:

twolame [options] <infile> [outfile]

Both input and output filenames can be set to - to use stdin/stdout.

<infile> input sound file (any format supported by libsndfile)

<outfile> output bit stream of encoded audio

Input Options

-r, --raw-input input is raw signed PCM audio

-x, --byte-swap force byte-swapping of input

-s, --samplerate srate sampling frequency of raw input (Hz)

--samplesize bits size of raw input samples in bits (default 16-bit)

--samplefloat 32-bit float raw input

-N, --channels nch number of channels in raw input

-g, --swap-channels swap channels of input file

--scale value scale input (multiply PCM data)

--scale-l value scale channel 0 (left) input

--scale-r value scale channel 1 (right) input

Output Options

-m, --mode mode (s)tereo, (j)oint, (d)ual, (m)ono or (a)uto

-a, --downmix downmix from stereo to mono file for mono encoding

-b, --bitrate br total bitrate in kbps (default 192 for 44.1kHz)

-P, --psyc-mode psyc psychoacoustic model -1 to 4 (default 3)

-v, --vbr enable VBR mode

-V, --vbr-level lev enable VBR and set VBR level -50 to 50 (default 5)

-B, --max-bitrate rate set the upper bitrate when in VBR mode

-l, --ath lev ATH level (default 0.0)

-q, --quick num only calculate psy model every num frames

-S, --single-frame only encode a single frame of MPEG Audio

Miscellaneous Options

-c, --copyright mark as copyright

-o, --non-original mark as non-original

--original mark as original (default)

-p, --protect enable CRC error protection

-d, --padding force padding bit/frame on

-R, --reserve-bits num set number of reserved bits in each frame

-e, --deemphasis emp de-emphasis n/5/c (default: (n)one)

-E, --energy turn on energy level extensions

Verbosity Options

-t, --talkativity num talkativity 0-10 (default is 2)

--quiet same as --talkativity=0

--brief same as --talkativity=1

--verbose same as --talkativity=4

Allowable bitrates for 32, 44.1 and 48kHz sample input (MPEG-1)

32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384

Allowable bitrates for 16, 22.05 and 24kHz sample input (MPEG-2)

8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160