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

[Peter Harris]

Nescafe wrote:
> My final questions is :
> What is to blame for this sample ?
> Redundancy, or maybe window size, or what ever ?

I'd guess redundancy.

And, yes, MP3 and Vorbis do use different block sizes. Maybe that 
accounts for MP3 not being recompressable with .zip (pure dumb luck in 
where the blocks line up with your repetative sample)?

> Shouldn't Vorbis take this redundancy into account ?

No. That would prevent (or at least horribly complicate) both seeking 
and streaming. Besides, it doesn't help on 99+% of the samples out there.

(On this directory of 195 different oggs, zip gets anywhere from 0% to 
1.5% compression. Not very impressive. Again, your song is highly unusual.)

Peter Harris

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