Archives
Tremor - Fixed Point Ogg Vorbis Decoder
The folks at Ogg Vorbis would like to see their audio format work its way into some hardware players. One good effort towards making this happen is a fixed=point implementation of the algorithm, which can then presumably be ported to machines using cheaper CPUs that lack the sophisticated FPUs of our desktop machines.
http://www.xiph.org/ogg/vorbis/hardware.htmlLHA Notes
Nice detailed documentation on the structure of an LHA file. If you’re going to attempt to support LHA files, you need a pointer to this doc.
http://homepage1.nifty.com/dangan/en/Content/Program/Java/jLHA/Notes/Notes.htmlData Compression Site
This site is in Russian, so I am not able to tell you much about it. It has links to some papers, and seems to have a link to PDF files that comprise much of a book on compression.
Reader Dan L. says The best site about comression!
http://compression.graphicon.ru/A Method for the Construction of Minimum-Redundancy Codes
The famous paper by David Huffman, as originally published in the Proceedings of the I.R.E.
http://compression.graphicon.ru/download/articles/huff/huffman_1952_minimum-redundancy-codes.pdfread more from " A Method for the Construction of Minimum-Redundancy Codes "
TCompLHA component set
A Delphi component. TCompLHA helps you create and manage archives compatible with the popular freeware LHArc and LHA utilities (these archives can also be processed by the popular WinZip program if you have LHA). Simple one-step methods such as Scan, Compress, Expand, Delete and Verify make archive management very easy. In addition it includes the […]
http://www.spis.co.nz/complha.htmStreambox Action
Streambox ACTION is an easy to use video encoding application for serious amateurs and webmasters. ACTION goes beyond simple “file save” routines in video editors, allowing you to interactively optimize your video for specific streaming data rates while preserving video quality. ACTION is specifically designed to produce output optimized for the best progressive […]
http://www.streambox.com/products/streambox_action.htmTake A HyperDrive On The Internet Super Highway
Pegasus Web Services has a new compression algorithm that they say can put 1.2GB on a floppy disk! No demo software yet, but if you’re interested in licensing the technology they are ready to talk.
http://www.fly-pegasus.com/pr_invent.htmread more from " Take A HyperDrive On The Internet Super Highway "
Windows Media 9: Better sound, smaller files
Josh Taylor of ZDNet did a quickie informal comparison of the new Windows Media 9 format and gives it a thumbs-up.
http://www.zdnet.com/anchordesk/stories/story/0,10738,2879818,00.htmlread more from " Windows Media 9: Better sound, smaller files "
Wavelet Filter Evaluation for Image Compression
by John D. Villasenor, Benjamin Belzer, and Judy Liao. A paper discussing the choice of filter bank for wavelet compression. PS format only.
http://www.icsl.ucla.edu/~ipl/Publications/Journal/wavelet_filter_evaluation_for_image_compression.pdfread more from " Wavelet Filter Evaluation for Image Compression "
DemoGraFX to offer imaging IP cores in strategy shift
DemoGraFX Inc. is going to be selling their video compression technology to semiconductor companies and system vendors. EE Times has the scoop.
http://www.eetimes.com/story/OEG20020904S0029read more from " DemoGraFX to offer imaging IP cores in strategy shift "
Voice Recording Applet SDK
The voice recording applet SDK is designed for the web developers and allows to record the voice from web site, to compress it and to send to the web server via HTTP. To playback the recorded voice from the server the embedded voice streaming player or a separate player as a voice streaming applet can […]
http://www.vimas.com/ve_record_applet_sdk.htmOgg Vorbis Wins a Listening Test
This German news item reports on a test that pitched Ogg Vorbis against MP3, Window Media, AAC, and RealAudio. My Babelfish translation says In particular with 64 kBit/s Ogg Vorbis could convince and left the entire prominent competition behind itself. I think that means it won!
http://www.heise.de/newsticker/data/anw-08.09.02-000/Free Specs from the ITU
According to Pete Fraser, you can download three free specifications from the ITU per year, after free registration. This is a great deal - these specs can run into the hundreds of dollars per copy, and if you aren’t near a university library, you may have no other way to get them.
http://groups.google.com/groups?selm=umpssdh2ls194%40news.supernews.comLZW Patent Expiration
This thread reveals the actual dates for the LZW patent expiration, including US, European, and Japanese patents.
http://groups.google.com/groups?&threadm=a5aa8dd0.0208271613.3cd18da6%40posting.google.comVidfern Squeezer
Squeezer is another executable compressor for Windows, and it’s now free. Here’s what you’ll read on the Vidfern web site:
Vidfern Squeezer as the best file compressor, can squeeze executable files as well as text and HTML files. Get more space by squeezing your files! Squeezer is now free for personal and commercial use. It is […]
http://www.vidfern.7p.com/squeezer/Draft ITU Standards
This directory appears to contain draft standards for H.261, H.263, and H.264.
Note: this site moved to the current ftp location as of 9/15/2002.
LAME Ain’t an Mp3 Encoder
Despite the protestations, you can use LAME to create MP3 streams. It does it with the magic of the ISO demo code. LAME isn’t lame, lots of people seem to like it.
http://www.mp3dev.org/mp3/IZArc
IZArc is a free multi-format archiver. Supports the following formats: ACE, ARC, ARJ, BH, BZ2, CAB, ENC, GZ, HA, JAR, LHA, LZH, MBF, MIM, PAK, PK3, RAR, TAR, TBZ, TGZ, UUE, XXE, Z, ZIP, ZOO. Pretty good list, wouldn’t you say?
http://free.top.bg/izsoft/CHAOS Self Extractor
CHAOS Self-Extractor is a utility program that creates self-extracting ZIP files for Windows. CHAOS supports a form of encryption that it claims is much stronger than standard Zip encryption.
http://www.safechaos.com/chse.htmThe Zip, GZip, BZip2 and Tar Implementation For .NET
#ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language). The creator of #ziplib put it this way: “I’ve ported the zip […]
http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspxread more from " The Zip, GZip, BZip2 and Tar Implementation For .NET "
Effective Arithmetic Coding
Sachin Garg’s article and source on arithmetic coding, includes a 64-bit implementation.
http://www.geocities.com/schngrg/sgarith.htmlSqueez - The Ultimate Compression Utility
Squeez is a fast file compression application, supporting many different archive formats. It reads and writes files in the formats ACE, ARJ, BZIP, CAB, GZIP, LZH, RAR, SQX, TAR, UUE and ZIP without any additional software. Unlike many other archivers, Squeez can read and write ZIP files (so called Zip64 archives) that have no limits […]
http://www.speedproject.de/enu/squeez/index.htmlread more from " Squeez - The Ultimate Compression Utility "
ZipStar
ZipStar is a free archiving application for home users. It can create, modify and extract the archive formats SQX, CAB and ZIP. Besides the application itself, ZipStar also provides an extension for the Windows Explorer. With this extension it is possible to extract or create archives directly within Windows Explorer.
ZipStar may be used free of […]
http://www.speedproject.de/enu/zipstar/index.htmlAn Implementation of EZW
A C implementation of Shapiro’s EZW algorithm. Performance is close/better than the reported results with the wavelet filters.
http://pesona.mmu.edu.my/~msng/EZW.htmlWavelets and Signal Processing
Ian Kaplan’s Wavelet and Signal Processing page has lots of articles and C++/Java source code implementing wavelet transform via the lifting scheme, the integer-to-integer wavelet transform and the best basis wavelet packet transform
http://www.bearcave.com/misl/misl_tech/wavelets/index.htmlWinBig
A file archive utility written in VB. Compression and decompression routines are LZSS. Full source code included.
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=29329&lngWId=1DjVu - Next generation image compression technology
DjVu is an image compression technique that is meant to be used on scanned documents. AT&T has created a browser plugin that supports DjVu files. AT&T claims that DjVu files are 5 to 8 times smaller than GIF or JPEG images of similar quality. Some public source code is provided here, but the exciting parts […]
http://www.djvuzone.org/read more from " DjVu - Next generation image compression technology "
Compresssion Algorithms and Applications to Genetic Sequence Analysis
PhD thesis by Éric Rivals.
http://www.lirmm.fr/~rivals/Publication/These/PhD.htmlread more from " Compresssion Algorithms and Applications to Genetic Sequence Analysis "
IEEE Transactions on Information Theory
Links to the articles from this journal dating back to 1988. If you’re not an IEEE member, you only get to see the abstracts! Membership in the IEEE plus a few extra bucks lets you download here to your heart’s content.
Update: Site has moved due to redesign.
http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?puNumber=18DjVu Technical Papers
This page has a number of papers related to the DjVu compression format. Papers are all posted in ps.gz and DjVu formats. Note that you’ll need the DjVu plugin to read them in that format.
http://www.djvuzone.org/techpapers/index.html