[vorbis] Low bitrate encoding

[Monty]

> The best I've gotten with the ogg tools I've tried is about 65kbps,
> VBR.  The quality is much better, but the compression is predictably
> not as good.  I've read that ogg is currently capable of "fixed and
> variable bitrates from 16 to 128 kbps/channel." Should I be able to
> encode an ogg file at a fixed bitrate of 16kbps, or is that feature
> still in the vaporware stage?

oggenc currently doesn't know how to downsample or lowpass.  If you
feed it a lower sample rate file, you'll see down to ~ 16-20kbps right
now.  It's not well tuned for it yet, so preecho (especially) will be
annoying.

Fixed bitrate isn't done yet.  We're still VBR-only.

Monty

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