NAME
aacgain − normalizes the volume of digital music files
SYNOPSIS
aacgain [options] <infile> [<infile 2> ...]
DESCRIPTION
aacgain version 1.9.0, derived from mp3gain version 1.5.2 copyright(c) 2001−2009 by Glen Sawyer AAC support copyright(c) 2004−2009 David Lasker, Altos Design, Inc. uses mpglib, which can be found at http://www.mpg123.de AAC support uses faad2 (http://www.audiocoding.com), and mpeg4ip’s mp4v2 (http://www.mpeg4ip.net)
options:
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−v − show version number |
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−g <i> − apply gain i without doing any analysis |
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−l 0 <i> − apply gain i to channel 0 (left channel) |
without doing any analysis (ONLY works for STEREO files, not Joint Stereo)
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−l 1 <i> − apply gain i to channel 1 (right channel) | |
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−e − skip Album analysis, even if multiple files listed | |
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−r − apply Track gain automatically (all files set to equal loudness) | |
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−k − automatically lower Track/Album gain to not clip audio |
−a − apply Album gain automatically (files are all from the same
album: a single gain change is applied to all files, so their loudness relative to each other remains unchanged, but the average album loudness is normalized)
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−m <i> − modify suggested MP3 gain by integer i | |
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−d <n> − modify suggested dB gain by floating−point n | |
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−c − ignore clipping warning when applying gain | |
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−o − output is a database−friendly tab−delimited list | |
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−t − writes modified data to temp file, then deletes original |
instead of modifying bytes in original file A temp file is always used for AAC files.
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−q − Quiet mode: no status messages |
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−p − Preserve original file timestamp |
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−x − Only find max. amplitude of file |
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−f − Assume input file is an MPEG 2 Layer III file |
(i.e. don’t check for mis−named Layer I or Layer II files)
This option is ignored for AAC files.
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−? or −h − show this message | |
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−s c − only check stored tag info (no other processing) | |
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−s d − delete stored tag info (no other processing) | |
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−s s − skip (ignore) stored tag info (do not read or write tags) | |
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−s r − force re−calculation (do not read tag info) | |
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−s i − use ID3v2 tag for MP3 gain info | |
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−s a − use APE tag for MP3 gain info (default) | |
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−u − undo changes made (based on stored tag info) | |
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−w − "wrap" gain change if gain+change > 255 or gain+change < 0 |
MP3 only. (use "−? wrap" switch for a complete explanation)
If you specify −r and −a, only the second one will work If you do not specify −c, the program will stop and ask before
applying gain change to a file that might clip