GZip/deflate appears to be surprisingly good for compressing mostly compressed stuff...

Compressing [CoalGuys] B Gata H Kei - 01 [531DF322].mkv with 7-Zip 9.12:

(LZMA/2 use a 64MB dictionary, 2 threads, 64 bytes word size)


Original size: 374,233,074 bytes

.7z
Store:         374,233,256 bytes
LZMA:          377,964,947 bytes
LZMA2:         373,963,350 bytes
BZip2:         374,750,452 bytes

.gz
Deflate        373,694,877 bytes

.xz
LZMA2          373,963,224 bytes


But LZMA2 does appear to be a superior algorithm in general.

(This post was last modified: 03/05/2010 02:03 AM by ZiNgA BuRgA.)

0.1% smaller!!!


EDIT: what about that really crazy algorithm?  PAQ or whatever it's called.... let me guess.... it would take too long to do?

(This post was last modified: 03/05/2010 02:35 AM by Assassinator.)

(03/05/2010 02:18 AM)Assassinator Wrote:  0.1% smaller!!!

I like to think in absolute terms :P.  Reducing a 1GB file to 900MB is much better than reducing a 100MB file to 20MB, on the consideration of file storage and downloading ;)

I dunno why Deflate was removed as an option from the 7-Zip GUI for 7z archives (maybe cause LZMA2 pretty much covers everything?) - the CLI still supports it.  PPMd > LZMA/2 for text, but I dunno why BZip2 is there...

(03/05/2010 02:18 AM)Assassinator Wrote:  EDIT: what about that really crazy algorithm?  PAQ or whatever it's called.... let me guess.... it would take too long to do?

No-one cares about PAQ!

(This post was last modified: 03/05/2010 02:51 AM by ZiNgA BuRgA.)

(03/05/2010 03:07 AM)PSPkiller Wrote:  WHY IS EVERYTHING CENTRE ALIGNED?????

Cause you're wearing your glasses sideways.

(03/05/2010 02:49 AM)ZiNgA BuRgA Wrote:  

(03/05/2010 02:18 AM)Assassinator Wrote:  0.1% smaller!!!

I like to think in absolute terms :P.  Reducing a 1GB file to 900MB is much better than reducing a 100MB file to 20MB, on the consideration of file storage and downloading ;)

Ok then...

538197B = ~0.5MB smaller.

>.>

(03/05/2010 10:33 PM)Assassinator Wrote:  Ok then...

538197B = ~0.5MB smaller.

>.>

"640K ought to be enough for anybody"

(15/05/2010 11:33 AM)Jeffrey364 Wrote:  - I just posted this on google bizz

Regards

Jeffrey

don't you mean google buzz??

Lol, fail spammer.

Hmm, I always thought LZMA was superior to RAR for textual content.  Doesn't always seem to be the case...

XThreads script v1.10 - uncompressed = 210,215 bytes

RAR - WinRAR 3.90
Best compression (solid) = 41,578 bytes

7z - 7-Zip 9.13 beta
LZMA (solid) 128MB dict, 64 word size, 1 thread = 47,483 bytes
LZMA2 (solid) 128MB dict, 64 word size, 1 thread = 47,484 bytes
PPMd (solid) 256MB dict, 32 word size, 1 thread = 39,601 bytes

PAQ8
PAQ8KX Max compression = 30,432 bytes (took 1.9GB of RAM and 101 seconds to do the job)
PAQ8PF Max compression = 35,268 bytes (took 1.2GB of RAM and 2.7 seconds to do the job)

(This post was last modified: 04/06/2010 11:03 PM by ZiNgA BuRgA.)