[vorbis] Quality & ripping speed

[Giuliano Pochini]

> 4.99 was a "special" number in rc3 - since lossless stereo coupling
> kicked in abruptly at 5.0 and there was a noticable size jump between
> the two. 
>
> In 1.0, I believe the threshold has been bumped to 6.0, and the
> transition is smoother - so the size jump shoulnd't be so abrupt.

I made some brief test and IMHO lossless stereo still starts at 5.0. I
can easily hear the difference between 4.99 and 5.0 with some type of
sound and there is a bit rate jump of about 10%. btw I couldn't find
where in the sources it choose the coupling method... hmm probably
there aren't discrete coupling methods anymore. I think online docs
are a bit outdated.

> As for the quality between 5.0 and 6.0? hell, don't ask me. I could
> barely ABX RC3 at -q2 with my ears and hardware!

It mostly depends on what kind of sound you're making the tests... and
use at least mid-quality headphones, not that crappy self-powered
plastic speakers you can buy in computer shops.

<p>Bye.

<p>--- >8 ----
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