>
> > Is it theoretically possible to amplify the sound in a mp3 file without
> > reencoding it? What would be the quality loss of this operation?
>
> Yes: modifying the global_gain field in each channel of each granule in a
> Layer III frame has the effect of amplifying or diminishing the decoded signal
> in increments of 1.5 dB.
>
> There is apparently no quality loss associated with this change as long as the
> signal is not amplified so much as to cause clipping.
>
This utility will do exactly that:
http://www.chat.ru/~lrsp/English/index.html
Mark
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MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
