[MPlayer-users] Re: Best way to dump pcm to a wav and ogg, ogm support

Tobias Diedrich ranma at gmx.at
Fri Mar 21 03:52:03 CET 2003

D Richard Felker III wrote:

> I advise against normalizing sound. Frequency-space codecs don't seem
> too fond of waveforms that actually take on the peak values (+-32k);
> when prenormalization is used, the vorbis encoder will often generate
> a bitstream that's much lower quality than when encoding the original
> input, and the decoded output will have samples that go over 1.0
> (32k), resulting in nasty clipping. I could speculate about the
> mathematics of why this happens, but it seems best just to avoid
> normalization and adjust your volume knob as necessary.

normalization != volume maximization

I regularly use normalize to get mp3's that have
1) similar perceived loudness
2) don't clip (e.g. normalize reduces the level in most cases)

From the normalize manpage:
|       -a, --amplitude=AMPLITUDE
|              Adjust the RMS volume to the target amplitude AMPLITUDE; must be
|              between 0.0 and 1.0. If a number suffixed by "dB" or  "dBFS"  is
|              specified,  the amplitude is assumed to be in decibels from full
|              scale.  The default is -12dBFS.

Tobias								PGP: 0x9AC7E0BC
This mail is made of 100% recycled bits
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