[vorbis] Short block test

[Aleksandar Dovnikovic]

Frank Klemm made the clip to test short block switching -
it's made of series of short periodical 'pulses', and this period
gets smaller as time passes. 

You can get this file at:
http://www.uni-jena.de/~pfk/Short_Block_Test.wav.gz.gz (1.6MB)
(uncompress it twice with gzip)

I used oggenc beta3 & mp+ 1.7.8

Oggenc gave 160kbps using mode -b 256
mp+ gave 350kbps (using "standard" profile and with joint-stereo off)

I couldn't use mode -b 350 because oggenc always hangs at 98% with
this clip and the file produced has annoying distorsions...

Obviosly (like Monty said) Vorbis is still learning and needs more
tweaking in the short-block detection department (and must also
avoid some patents)...

Greetings,
Aleksandar

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