[vorbis] Bzip2 & Ogg Vorbis

Graham Mitchell graham at grahammitchell.net
Tue Dec 24 06:19:15 PST 2002

On Tuesday 24 December 2002 16:13, Daniil V. Kolpakov wrote:
> On 24 äÅËÁÂÒØ 2002 00:30, Olaf van der Spek wrote:
> >
> > I've got some (seven) Ogg Vorbis files with a total size of 18637246
> > bytes. When I use bzip2 to compress these files, the total size is
> > 16949443. That's 10% less.
> Well I can't reproduce that:

Me either.  What quality setting did you use?

My results:

Soul Coughing - Ruby Vroom, entire album, one file per track, quality 4
    bzip2'ed oggs save 0.181% over oggs alone (less than two-tenths of 1%)
Grits - The Art of Translation, entire album, one file per track, -q 4
    bzip2'ed oggs save 0.15% over oggs alone
The Matrix - Music from the Motion Picture - entire album as one track, -q 3
    bzip2'ed ogg saves 0.183% over the ogg alone

Generating optimal huffman codes (with rehuff or something similar) beats this 
by an order of magnitude at least, and remains streamable.

Graham Mitchell - computer science teacher, Leander High School
A girl and a boy bump into each other -- surely an accident.
A girl and a boy bump and her handkerchief drops -- surely another accident.
But when a girl gives a boy a dead squid -- *that had to mean something*
	-- S. Morganstern, "The Silent Gondoliers"

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