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viz bod 5. v README k normalize-audio:

Can normalize operate directly on mp3 files? Version 0.7 and up can operate directly on MPEG audio files. An mp3 file is decoded (using Robert Leslie's MAD library) and analyzed on the fly, without the need for large temporary WAV files. The mp3 file is then "adjusted" by setting its relative volume adjustment information (technically, an "RVA2" frame is set in its ID3v2 tag). The advantage of this method is that the audio data doesn't need to be touched, and you don't incur the cost of re-encoding. The disadvantage is that your mp3 player needs to read and use relative volume adjustment ID3 frames. The normalize distribution now includes a plugin for xmms that honors volume adjustment frames. If you use an mp3 player other than xmms, you'll have to bug the author to support RVA2 frames in ID3 tags. If you'd rather change the volume of the mp3 audio data itself, you still have to decode to WAV, normalize the WAV, and re-encode. A script, normalize-mp3, is included in the normalize distribution to do this for you.

.. tedy bez rekomprese to uklada do ID3v2 tagu jako metadata

nu a mplayer? otazka z 2007:

> Hello,
> 
> Just wondering if there is any way to adjust the volume of an mp3
> file using the RVA2 id3 tag under mplayer.  The other players I use
> (mpg123 and mpd) both support RVA so mp3s play at the same volume but
> when I play a file with mplayer, it comes over quite loud.

Probably not.

> If mplayer doesn't directly support RVA, can a DB gain be supplied on
> the commandline?  I could then write a script to extract the RVA and
> feed it to mplayer.

-af volume

Pokud tedy mplayer prehrava oba soubory s jinou hlasitosti, tak se dle vseho od 2007 v podpore RVA2 nic nezmenilo