mirror of
https://github.com/cookiengineer/audacity
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286 lines
7.5 KiB
Groff
286 lines
7.5 KiB
Groff
.\" Title: twolame
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.\" Author:
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.\" Generator: DocBook XSL Stylesheets v1.71.0 <http://docbook.sf.net/>
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.\" Date: 01/09/2008
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.\" Manual:
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.\" Source:
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.\"
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.TH "TWOLAME" "1" "01/09/2008" "" ""
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.SH "NAME"
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twolame \- an optimised MPEG Audio Layer 2 (MP2) encoder
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.SH "SYNOPSIS"
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\fItwolame\fR [options] <infile> [outfile].sp
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.SH "DESCRIPTION"
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TwoLAME is an optimised MPEG Audio Layer 2 (MP2) encoder based on tooLAME by Mike Cheng, which in turn is based upon the ISO dist10 code and portions of LAME. Encoding is performed by the libtwolame library backend..sp
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.SH "OPTIONS"
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.SS "Input File"
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twolame uses libsndfile for reading the input sound file, so the input file can be in any format supported by libsndfile. To read raw PCM audio from STDIN, then use \- as the input filename..sp
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.SS "Output File"
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If no output filename is specified, then suffix of the input filename is automatically changed to .mp2. To write the encoded audio to STDOUT then use \- as the output filename..sp
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.SS "Input Options"
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.PP
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\-r, \-\-raw\-input
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.RS 3n
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Specifies that input is raw signed PCM audio. If audio is stereo, than audio samples are interleaved between the two channels.
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.RE
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.PP
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\-x, \-\-byte\-swap
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.RS 3n
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Force byte\-swapping of the input. Endian detection is performed automatically by libsndfile, so this option shouldn't normally be needed.
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.RE
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.PP
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\-s, \-\-samplerate <int>
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.RS 3n
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If inputting raw PCM sound, you must specify the sample rate of the audio in Hz. Valid sample rates: 16000, 22050, 24000, 32000, 44100, 48000Hz. Default sample rate is 44100Hz.
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.RE
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.PP
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\-\-samplesize <int>
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.RS 3n
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Specifies the sample size (in bits) of the raw PCM audio. Valid sample sizes: 8, 16, 24, 32. Default sample size is 16\-bit.
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.RE
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.PP
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\-N, \-\-channels <int>
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.RS 3n
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If inputting raw PCM sound, you must specify the number of channels in the input audio. Default number of channels is 2.
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.RE
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.PP
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\-g, \-\-swap\-channels
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.RS 3n
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Swap the Left and Right channels of a stereo input file.
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.RE
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.PP
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\-\-scale <float>
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.RS 3n
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Scale the input audio prior to encoding. All of the input audio is multiplied by specified value. Value between 0 and 1 will reduce the audio gain, and a value above 1 will increase the gain of the audio.
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.RE
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.PP
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\-\-scale\-l <float>
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.RS 3n
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Same as \-\-scale, but only affects the left channel.
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.RE
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.PP
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\-\-scale\-r <float>
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.RS 3n
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Same as \-\-scale, but only affects the right channel.
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.RE
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.SS "Output Options"
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.PP
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\-m, \-\-mode <char>
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.RS 3n
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Choose the mode of the resulting audio. Default is auto.
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.RS 3n
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.TP 3n
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\(bu
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"a" auto \- choose mode automatically based on the input
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.TP 3n
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\(bu
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"s" stereo
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.TP 3n
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\(bu
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"d" dual channel
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.TP 3n
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\(bu
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"j" joint stereo
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.TP 3n
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\(bu
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"m" mono
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.RE
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.RE
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.PP
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\-a, \-\-downmix
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.RS 3n
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If the input file is stereo then, downmix the left and right input channels into a single mono channel.
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.RE
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.PP
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\-b, \-\-bitrate <int>
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.RS 3n
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Sets the total bitrate (in kbps) for the output file. The default bitrate depends on the number of input channels and samplerate.
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.sp
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.RS 3n
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.nf
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\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
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Sample Rate Mono Stereo
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\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
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48000 96 192
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44100 96 192
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32000 80 160
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24000 48 96
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22050 48 96
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16000 32 64
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\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
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.fi
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.RE
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.RE
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.PP
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\-P, \-\-psyc\-mode <int>
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.RS 3n
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Choose the psycho\-acoustic model to use (\-1 to 4). Model number \-1 is turns off psycho\-acoustic modelling and uses fixed default values instead. Please see the file
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\fIpsycho\fR
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for a full description of each of the models available. Default model is 3.
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.RE
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.PP
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\-v, \-\-vbr
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.RS 3n
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Enable VBR mode. See
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\fIvbr\fR
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documentation file for details. Default VBR level is 5.0.
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.RE
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.PP
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\-v, \-\-vbr\-level <float>
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.RS 3n
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Enable VBR mode and set quality level. The higher the number the better the quality. Maximum range is \-50 to 50 but useful range is \-10 to 10. See
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\fIvbr\fR
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documentation file for details.
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.RE
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.PP
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\-l, \-\-ath <float>
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.RS 3n
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Set the ATH level. Default level is 0.0.
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.RE
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.PP
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\-q, \-\-quick <int>
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.RS 3n
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Enable quick mode. Only re\-calculate psycho\-acoustic model every specified number of frames.
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.RE
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.PP
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\-S, \-\-single\-frame
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.RS 3n
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Enables single frame mode: only a single frame of MPEG audio is output and then the program terminates.
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.RE
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.SS "Miscellaneous Options"
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.PP
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\-c, \-\-copyright
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.RS 3n
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Turn on Copyright flag in output bitstream.
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.RE
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.PP
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\-o, \-\-non\-original
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.RS 3n
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Turn off Original flag in output bitstream.
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.RE
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.PP
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\-\-original
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.RS 3n
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Turn on Original flag in output bitstream.
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.RE
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.PP
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\-p, \-\-protect
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.RS 3n
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Enable CRC error protection in output bitstream. An extra 16\-bit checksum is added to frames.
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.RE
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.PP
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\-d, \-\-padding
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.RS 3n
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Turn on padding in output bitstream.
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.RE
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.PP
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\-R, \-\-reserve <int>
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.RS 3n
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Reserve specified number of bits in the each from of the output bitstream.
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.RE
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.PP
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\-e, \-\-deemphasis <char>
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.RS 3n
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Set the de\-emphasis type (n/c/5). Default is none.
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.RE
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.PP
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\-E, \-\-energy
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.RS 3n
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Turn on energy level extensions.
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.RE
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.SS "Verbosity Options"
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.PP
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\-t, \-\-talkativity <int>
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.RS 3n
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Set the amount of information to be displayed on stderr (0 to 10). Default is 2.
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.RE
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.PP
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\-\-quiet
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.RS 3n
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Don't send any messages to stderr, unless there is an error. (Same as \-\-talkativity=0)
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.RE
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.PP
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\-\-brief
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.RS 3n
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Only display a minimal number of messages while encoding. This setting is quieter than the default talkativity setting. (Same as \-\-talkativity=1)
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.RE
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.PP
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\-\-verbose
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.RS 3n
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Display an increased number of messages on stderr. This setting is useful to diagnose problems. (Same as \-\-talkativity=4)
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.RE
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.SH "RETURN CODES"
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If encoding completes successfully, then twolame will return 0. However if encoding is not successful, then it will return one of the following codes..sp
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.TP 3n
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\(bu
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1 (No encoding performed)
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.TP 3n
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\(bu
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2 (Error opening input file)
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.TP 3n
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\(bu
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4 (Error opening output file)
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.TP 3n
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\(bu
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6 (Error allocating memory)
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.TP 3n
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\(bu
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8 (Error in chosen encoding parameters)
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.TP 3n
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\(bu
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10 (Error reading input audio)
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.TP 3n
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\(bu
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12 (Error occured while encoding)
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.TP 3n
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\(bu
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14 (Error writing output audio)
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.SH "EXAMPLES"
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This will encode sound.wav to sound.mp2 using the default constant bitrate of 192 kbps and using the default psycho\-acoustic model (model 3):.sp
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.sp
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.RS 3n
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.nf
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twolame sound.wav
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.fi
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.RE
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Constant bitrate of 160kbps and joint stereo encoding, saved to file sound_160.mp2:.sp
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.sp
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.RS 3n
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.nf
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twolame \-b 160 \-m j sound.aiff sound_160.mp2
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.fi
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.RE
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Encode sound.wav to newfile.mp2 using psycho\-acoustic model 2 and encoding with variable bitrate:.sp
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.sp
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.RS 3n
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.nf
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twolame \-P 2 \-v sound.wav newfile.mp2
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.fi
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.RE
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Same as example above, except that the negative value of the "\-V" argument means that the lower bitrates will be favoured over the higher ones:.sp
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.sp
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.RS 3n
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.nf
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twolame \-P 2 \-V \-5 sound.wav newfile.mp2
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.fi
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.RE
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Resample audio file using sox and pipe straight through twolame:.sp
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.sp
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.RS 3n
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.nf
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sox sound_11025.aiff \-t raw \-r 16000 | twolame \-r \-s 16000 \- \- > out.mp2
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.fi
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.RE
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.SH "AUTHORS"
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The twolame frontend was (re)written by Nicholas J Humfrey. The libtwolame library is based on toolame by Mike Cheng. For a full list of authors, please see the AUTHORS file..sp
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.SH "RESOURCES"
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TwoLAME web site: http://www.twolame.org/.sp
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.SH "SEE ALSO"
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lame(1), mpg123(1), madplay(1), sox(1).sp
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.SH "COPYING"
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Copyright \(co 2004\-2006 The TwoLAME Project. Free use of this software is granted under the terms of the GNU Lesser General Public License (LGPL)..sp
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