[vorbis] Best quality setting for mp3 transcoded old radio shows

[Geoff Shang]

On Tue, 2 Jul 2002, engdev wrote:

> Since vorbis only has support for 44KHz (currently), but MP3 has
> support all the way down to 8KHz, it is very likely that at the low
> bit rates you are talking about, that the MP3 files have a
> low sample rate.
> Re-encoding to OGG would require upsampling (probably done
> within MP32OGG) and the resulting re-code would not sound
> as good or reach the same file size. Probably. Suck it and see!

This is NOT correct.  vorbis has support for lower sampling rates.  It
works fine.  However, the libvorbis encoder is *not tuned* for lower
sampling rates, meaning that results for rates lower than 44.1khz are
suboptimal.  But to say that you can't do it at all is very wrong, has been
since ... beta 3 maybe?  Or earlier?  definitely for a long time.  so to
transcode, you won't have to upsample.  I might also add that even while
being untuned and not as economical as it could be, it definitely sounds
better than MP3 at those same rates (IMHO).

2 notes for those interested in the latest.  First is that current CVS
oggenc can now resample internally.  Yay!  And the other thing is that
Monty today committed tuned encodings for 32khz.  Role on RC4!

Geoff.

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Geoff Shang <gshang at uq.net.au>
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