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129 lines
3.7 KiB
Groff
129 lines
3.7 KiB
Groff
.TH MP3GAIN "1" "Jan 2018" "mp3gain version 1.6.1" "SlackBuilds.org"
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.SH NAME
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mp3gain \- analyzes and adjusts mp3 files so that they have the same volume
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.SH SYNOPSIS
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.B mp3gain
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[\fIoptions\fR] \fI<infile> \fR[\fI<infile 2> \fR...]
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.SH DESCRIPTION
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Tired of reaching for your volume knob every time your mp3 player changes to a new song?
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MP3Gain analyzes and adjusts mp3 files so that they have the same volume.
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.PP
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MP3Gain does not just do peak normalization, as many normalizers do. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear.
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.PP
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Also, the changes MP3Gain makes are completely lossless. There is no quality lost in the change because the program adjusts the mp3 file directly, without decoding and re-encoding.
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.SH OPTIONS
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.TP
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\fB\-v\fR
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show version number
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.TP
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\fB\-g\fR <i>
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apply gain i to mp3 without doing any analysis
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.TP
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\fB\-l\fR 0 <i>
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apply gain i to channel 0 (left channel) of mp3
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without doing any analysis (ONLY works for STEREO mp3s,
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not Joint Stereo mp3s)
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.TP
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\fB\-l\fR 1 <i>
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apply gain i to channel 1 (right channel) of mp3
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.TP
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\fB\-e\fR 1 <i>
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skip Album analysis, even if multiple files listed
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.TP
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\fB\-r\fR
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apply Track gain automatically (all files set to equal loudness)
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.TP
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\fB\-k\fR
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automatically lower Track/Album gain to not clip audio
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.TP
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\fB\-a\fR
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apply Album gain automatically (files are all from the same
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album: a single gain change is applied to all files, so
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their loudness relative to each other remains unchanged,
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but the average album loudness is normalized)
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.TP
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\fB\-m\fR <i>
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modify suggested MP3 gain by integer i
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.TP
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\fB\-d\fR <n>
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modify suggested dB gain by floating\-point n
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.TP
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\fB\-c\fR
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ignore clipping warning when applying gain
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.TP
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\fB\-o\fR
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output is a database\-friendly tab\-delimited list
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.TP
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\fB\-t\fR
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mp3gain writes modified mp3 to temp file, then deletes original
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instead of modifying bytes in original file
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.TP
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\fB\-T\fR
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Assume input file is an MPEG 2 Layer III file (i.e. don't check for mis-named Layer I or Layer II files)
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.TP
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\fB\-q\fR
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Quiet mode: no status messages
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.TP
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\fB\-p\fR
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Preserve original file timestamp
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.TP
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\fB\-x\fR
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Only find max. amplitude of mp3
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.TP
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\fB\-f\fR
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Force mp3gain to assume input file is an MPEG 2 Layer III file
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(i.e. don't check for mis\-named Layer I or Layer II files)
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.TP
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\-? or \fB\-h\fR
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show built-in help message
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.TP
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\fB\-s\fR c
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only check stored tag info (no other processing)
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.TP
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\fB\-s\fR d
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delete stored tag info (no other processing)
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.TP
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\fB\-s\fR s
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skip (ignore) stored tag info (do not read or write tags)
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.TP
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\fB\-s\fR r
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force re\-calculation (do not read tag info)
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.TP
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\fB\-s\fR i
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use ID3v2 tag for MP3 gain info
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.TP
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\fB\-s\fR a
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use APE tag for MP3 gain info (default)
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.TP
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\fB\-u\fR
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undo changes made by mp3gain (based on stored tag info)
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.TP
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\fB\-w\fR
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"wrap" gain change if gain+change > 255 or gain+change < 0
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(use "\-? wrap" switch for a complete explanation)
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.PP
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If you specify \fB\-r\fR and \fB\-a\fR, only the second one will work.
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If you do not specify \fB\-c\fR, the program will stop and ask before
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applying gain change to a file that might clip.
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.SH AUTHORS
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Coding by Glen Sawyer
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.br
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Unix-ification by Stefan Partheymüller
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.br
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DLL-ification by John Zitterkopf
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.br
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Additional tweaks by Artur Polaczynski, Mark Armbrust, and others
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.PP
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Man page created by B. Watson for the SlackBuilds.org project, but may
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be used by others.
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.SH COPYRIGHT
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Copyright(c) 2001-2004 by Glen Sawyer.
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.PP
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mp3gain uses mpglib, which can be found at \fIhttp://www.mpg123.de\fR.
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.PP
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mp3gain is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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.SH SEE ALSO
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\fBnormalize(1)\fR
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