Mark Lanctot;133723 Wrote:
> I tried all this out using the GUI to check what was done, and I'm
> pretty sure /c /r /s r will calculate gain and write it to an APE tag,
> but not alter data, i.e. the GUI shows that the file has been analyzed
> but not altered.
>
> It's the /g ("gain" I presume) switch that actually alters the data.
>
> Try these various options out and check it with the GUI.
It does alter the data. Make a copy of any "virgin" mp3 and apply
mp3gain with your settings. Now play back the two files on any
device/program that doesn't handle replay gain. They will not play at
the same volume level (unless the original mp3 was already at 89dB).
The /g switch can be used to manually adjust gain.
Sadly, the usage of mp3gain without options isn't documented anywhere.
-s.
Complete command line options for mp3gain:
Usage: c:\mp3gain.exe [options] <infile> [<infile 2> ...]
options:
/v - show version number
/g <i> - apply gain i to mp3 without doing any analysis
/l 0 <i> - apply gain i to channel 0 (left channel) of mp3
without doing any analysis (ONLY works for STEREO
mp3s,
not Joint Stereo mp3s)
/l 1 <i> - apply gain i to channel 1 (right channel) of mp3
/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 - mp3gain writes modified mp3 to temp file, then deletes
original
instead of modifying bytes in original file
/q - Quiet mode: no status messages
/p - Preserve original file timestamp
/x - Only find max. amplitude of mp3
/f - Force mp3gain to assume input file is an MPEG 2 Layer III
file
(i.e. don't check for mis-named Layer I or Layer II
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)
/u - undo changes made by mp3gain (based on stored tag info)
/w - "wrap" gain change if gain+change > 255 or gain+change <
0
(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
--
slimpy
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