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# aacgain -h
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)
Usage: aacgain [options] <infile> [<infile 2> ...]
options:
-v - show version number
-g <i> - apply gain i without doing any analysis
-l 0 <i> - apply gain i to channel 0 (left channel)
without doing any analysis (ONLY works for STEREO files,
not Joint Stereo)
-l 1 <i> - apply gain i to channel 1 (right channel)
-e - skip Album analysis, even if multiple files listed
-r - apply Track gain automatically (all files set to equal loudness)
-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)
-m <i> - modify suggested MP3 gain by integer i
-d <n> - modify suggested dB gain by floating-point n
-c - ignore clipping warning when applying gain
-o - output is a database-friendly tab-delimited list
-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.
-q - Quiet mode: no status messages
-p - Preserve original file timestamp
-x - Only find max. amplitude of file
-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.
-? or -h - show this message
-s c - only check stored tag info (no other processing)
-s d - delete stored tag info (no other processing)
-s s - skip (ignore) stored tag info (do not read or write tags)
-s r - force re-calculation (do not read tag info)
-s i - use ID3v2 tag for MP3 gain info
-s a - use APE tag for MP3 gain info (default)
-u - undo changes made (based on stored tag info)
-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