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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    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them.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.

7-Zip 4.30 beta released

Posted by Sachin Garg on 19th November 2005 | Permanent Link

You can now download latest beta (4.30) of 7-Zip.

Changes:
- Files 7zFMn.exe, 7zGn.exe, 7-zipn, 7za.exe, 7zC.sfx were removed from 7-zip package
- 7-Zip now uses uncompressed SFX: 7z.sfx
- Sfx modules 7z.sfx and 7zCon.sfx now use msvcrt.dll
- Speed optimizations in LZMA maximum/ultra compressing.
- LZMA now supports word size up to 273
- 7-Zip now reduces dictionary size for LZMA, if you compress files
smaller than specified dictionary size.
- 7-Zip now can use large memory pages:
GUI: 7-Zip File Manager / Options / Settings / Use large memory pages.
Command line version: -slp switch.
This feature allows to increase speed of compressing.
But 7-Zip can make some pause at starting of compressing for allocating large pages.
Also Task Manager doesn’t show real memory usage of program, if 7-Zip uses large pages.
This feature works only on Windows 2003 / XP x64 / Vista.
Also you must have administrator’s rights for your system.
Recommended size of RAM: 1 GB or more.
To install this feature you must run 7-Zip File Manager at least once,
close it and reboot system.
- Some bugs were fixed

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This entry was posted on Saturday, November 19th, 2005 at 10:30 am by Sachin Garg. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.