Author Page
Rarissimo
Rarissimo is a file utility to automatically compress and/or uncompress files, companion for the award winning compression program WinRAR. Distinguishable from other compression solutions by its ability to fully preserve NTFS alternate streams. This feature provides automatic compression/uncompression for Macintosh files stored on NT volumes preserving their filenames and peculiar structures - it means for […]
http://peccatte.karefil.com/Software/Rarissimo/RarissimoEN.htm
ColdCompress
ColdCompress presents an easy to use GUI for creating .tar.gz archives on Mac OS X Server.
MacRAR
MacRAR is the only RAR tool for Macintosh. Based upon Eugene Roshal’s sources and including a Mac interface, the package is delivered as shareware.
The shcodec Home Page
shcodec is order-0 32-bit canonical static huffman codec. It encodes an alphabet of 256 symbols with minimum-redundancy or length-restricted codes (basic method: Alistair Moffat and Jyrki Katajainen, modified by Artur A. Pessoa). shcodec uses efficient method for tree packing: on text files packed tree size is approx 68 bytes, on binary files this value is […]
Multimedia Test Sequences
Welcome to media.xiph.org, a repository for freely-redistributable test sets. We use these to test our codecs, and hope you will too. This site includes a partial mirror of the Video Quality Experts Group test sequences as well.
Guido’s Tech Corner
Guido Vollbeding has posted a number of items related to the IGJ code. Includes ways to crop, rotate, and merge JPEG files.
Bill Teahan’s Papers
Bill has links to some of his papers here, citations for all.
http://www.scms.rgu.ac.uk/staff/smc/researchcoord/staff_publications/wjt.html
Arithmetic Coder Visualisation
The author of this code created this visualization executable for a seminar.
DCL reader Drew D. downloaded the code, executed it, and had this to say about it: The program is an executable for windows with a dll and some gif’s. The program seems to require a screen size greater than 800×600 to view the fixed […]
Compression Plus 5.0
EllTech makes a compression library that supports zip files, plus a bunch of other formats, including ARC, ARJ, tarballs, etc.
Update! EllTech’s products were acquired by BeCubed Software. Compression Plus 5.0 appears to still be available.
http://www.becubed.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=B&Product_Code=080150
Pulsent promises bang-up video compression
Privately held Pulsent is promising a new video compression technique that can stream video across the net with only half the bandwidth of MPEG2. They’ve not only created a new algorithm but are also developing the chips to support it.
The Data Compression Conference
IEEE Data Compression Conference (DCC’2002), held each spring in Snowbird, Utah. This is the main event in the compression world. Note that the 2002 advance program is available here as of 3/02.
JBIG Standard - ITU T.82
This is the ITU page where you can purchase a copy of the JBIG specification for the modest price of 29 CFH. (You don’t really expect them to give this stuff away, do you?)
http://www.itu.int/rec/recommendation.asp?type=folders&parent=T-REC-T.82
True-Color GIF Example
Yes, it is possible to create GIF images with far more than 256 colors. This page will show you exactly how that is done, or at least prove to you that it is possible. It links to a GIF library called ANGIF that purports to be able to pull this trick off.
H.26L White Paper
A nice white paper of H.26L by the folks at UBVideo. The H.26L standard is a work in progress by both the ITU ISO, and is expected to provide outstanding performance in video coding.
H.263 White Paper
A white paper discussing the history and various permutations of the H.263 video encoding standard from the folks at UBVideo.
Zlib flaw leaves Linux computers vulnerable
CNET reports the existence of a bug in zlib that leaves room for security exploits. The bug is one that occurs when a program attempts to free allocated memory twice, which leaves the internals of the library in an unpredictable state.
Zzip - The New Compressor
A new archiver that uses a BWT algorithm to achieve superior compression. The author has now released the source code to zzip under the GPL.
Quad Tree Bit Determination
A program to compress images, plus a write up from author Doug Houghton. Doug says its simple and fast, and does pretty well on 24 bit color images. New release from Doug as of 3/2002
CEO leads cell phones to real-time rock
An article in EE Times that talks about the CEO of the company producing the Nancy video codec. Nancy has significantly lower MIPS requirements than MPEG-4, which has gotten it in the door of Japan’s 2.5G cell phone manufactures.
MELP coder
Source code for A 2.4 Kbps MELP coder. Target is Sun OS4. Phil Frisbie did the detective work needed to determine that the MELP coder is now owned by ASPI, so if you want to use it, you need to talk to them about licensing. See them at www.aspi.com.
Text In A Zip
This unique free program searchs through all your zip files looking for specific strings in specific file types.
PAR
A Win32 compression program. Free, and it appears to have very good compression.
Off-Line - Data Compression by Textual Substitution
A novel algorithm by Stefano Lonardi. It recursively replaces words in text with pointers, and boasts of good results. Source and papers regarding Off-Line can all be found here.
Pattern Matching Pointers
A really nice set of links to people and resources related to pattern matching. This is a great general purpose page of links, but only lightly grazes the data compression world.
PCWorld: Questions Dog ZeoSync’s Compression Claim
PCWorld takes a skeptical look at Zeosync’s claims, and looks askance at the felony conviction of a key employee.
Bob Cringely on Foveating Codecs
Bob talks about new codes that use more bits to compress the stuff you’re looking at, and fewer bits for things on the sidelines.
XiWave
XiWave’s wavelet-based Xi-3 codec is our latest dynamically scalable software codec (coder-decoder) and offers one of the best available today addressing the challenge of transmitting high quality digital images using the least bandwidth
Essential Viewing
Our technology set is based on the Essential Video 4.0 codec, which is a flexible and dynamic codec which utilises a number of video compression techniques using our BestFirst algorithm; methods include vector quantisation, motion compensation and residual encoding.
Functional Specification of the JPEG algorithm
A decoder for images compressed by the JPEG algorithm is stated in the pure functional programming language Gofer. The program can be regarded as a mathematical specification of the decompression algorithm; the concise description (which is included in full) is very suitable for learning about the algorithm. At the same time the `specification’ is an […]
SFXMaker
A free tool to convert zip file into self-extracting executables. Integrates with PowerArchiver.
