[vorbis] Ogg Vorbis files can be compressed ?!?

[Peter Harris]

Nescafe wrote:
> I tried to use ReHuff, using <malloc.h> because
> I am on a windows platform, but the output stream
> seemed invalid. However, it was only 126'499 bytes
> but packed aswell to 102'693 (zip) or even as low
> as 98'520 (rar3), but I guess this is not a valid test
> even though the file looked just like an ogg vorbis
> when opened with notepad :)

   136,140 sample.ogg
   127,023 sample-rehuff.ogg (6.6% savings vs ogg)
   110,284 sample.zip
   105,237 sample.7z         (22.7% savings vs ogg)
   103,832 sample-rehuff.zip
    99,292 sample-rehuff.7z  (21.8% savings vs ogg-rehuff)

Yup. I get the same results on that sample file (except my rehuff'd .ogg 
plays in WinAmp just fine). Strange. Maybe the repetative (and 
computer-generated) nature of that file makes it more zipable.

Rest assured that these results are not typical. Here is a random song 
pulled from my collection:

   3,243,113 sample.ogg
   3,230,274 sample.7z
   3,223,435 sample.zip        (0.6% savings vs ogg)
   3,212,980 sample-rehuff.ogg (0.9% savings vs ogg)
   3,199,101 sample-rehuff.7z
   3,190,042 sample-rehuff.zip (0.7% savings vs ogg-rehuff)

Peter Harris

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