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  • Bijective BWT (7 Comments)

    David Scott has written a bijective BWT transform, which brings all the advantages of bijectiveness to BWT based compressors. Among other things, making BWT more suitable for compression-before-encryption and also give (slightly) better compression.

  • Asymmetric Binary System (113 Comments)

    Jarek Duda’s “Asymmetric Binary System” promises to be an alternate to arithmetic coding, having all the advantages, but being much simpler. Matt has coded a PAQ based compressor using ABS for back-end encoding. Update: Andrew Polar has written an alternate implementation of ABS.

  • Precomp: More Compression for your Compressed Files (3 Comments)

    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them. Christian Schneider’s Precomp comes to rescue by undoing the harm.

  • On2 Technologies is Hiring

    There aren’t too many companies working on cutting edge codecs, and of those few this one is hiring. Best of luck.

  • China’s AVS Specifications Available (2 Comments)

    Its old news that China has developed their own Advanced Video Standard to avoid high licensing fees. English translation of the standard is now available, along with the IPR policy. Finally something technical that you can get your hands on to feed your appetite.

Adrian Rojak looks at Data Compression

Posted by Mark Nelson on 26th December 2005 | Permanent Link

Adrian Rojak decides to write up data compression programs on his site in an article titled, glibly, Data Compressors. (Note that his server doesn’t seem to be able to deal with his recent slashdotting, you might need to wait a few days to read the article.)

If you can navigate this slightly over-the-top site (good luck!), you might find some useful info, but to be honest, you could get the same stuff at sites like Jeff Gilchrist’s site, or the venerable Maximum Compression.

If you’re the type of person who likes to turn to the last page of a mystery to found out who did it, I’ll exert some fair use and the blockquote tag:

With the exception of the JPEG fileset, WinRK was the best compressor in virtually every fileset. Unfortunately, it was the slowest compressor in ALL filesets!

Popular compressors like WinZip and WinRAR did not exhibit strong results when set to their fastest setting. However, they were faster than Squeez or SBC Archiver, especially WinZip.

But the overall speed champion was the Linux favourite - gzip. It was consistently faster than any other compressor in this test (with the exception of the aforementioned StuffIt Standard). Thanks to its speed, it was also the compressor with the highest overall efficiency rating.

One Response to “Adrian Rojak looks at Data Compression”

  1. Sachin Garg Says:

    Just to add that c10n.info user “flagg” had also dropped by to tell us about this, thanks to him.

    And for those finding it hard to navigate that site, the article is broken into 13 pages, and the “next” link is at the extreme bottom on each page, after all the crummy ads.

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