[vorbis] (Un)Usefulness of Vorbisgain?

[Moritz Grimm]

David Tenser wrote:
> add/substract to the song. Let's say the result was -5.2dB, will that
> energy be taken out of the actual samples, or will it just tell the
> player to play this file 5.2dB quieter?

The latter, replaygain doesn't touch the encoded audio in any way. In
.ogg files, it simply writes some defined tags that get interpreted,
e.g. by in_vorbis.dll of Winamp. The player then plays the song on the
designated volume.

> Also, will this value of -5.2dB be applied to the whole song, even the
> quiet parts, thus not leveling out the volume for that particular song?

Replaygain is no loudness maximizer, i.e. combined compressor and
expander. Compression would alter the sound of the song, so that'd be a
bad thing anyways.

> Or to put it in other words, does it apply dynamic compression to the
> song, or does it just amplify it according to the results of the RMS
> tests etc.?

Yes, to the latter.

<p>Moritz

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