[vorbis] Quality -1 default low-pass

[Ross Levis]

Peter Harris wrote:

> oggenc cuts off frequencies where it needs to in order to get decent
> sound. I just ran a quick test here, and on this file (and this other
> one), the cut off is at 15kHz or so according to "Spectrogram 5.0.5".

I took a snapshot of my (OddCast) stream
(http://tx.icecast.net:8616/soulfm.ogg) and there is a sharp drop of energy
around 15khz you are right, but it kicks back in up to about 15.8khz which
seems a waste of space.  I guess it depends on the type of music.

> Hmm... and this test file doesn't sound as bad as I expected it to. I'm
> impressed.

So am I.  I was going to use 22050 quality 0 which provides a similar
bitrate but the quality of 44100/q-1 is more real with the extra treble.

Regards,
Ross.

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