data compression link collection


Standards relating to compression.

Overview of MPEG-2 Test Model 5

This document contains modified chapters from the original (now outdated) Test Model 5 document that pertain to MPEG-2 Video Main Profile.


Posted in July 2nd, 2007

MPEG-4 Video Verification Model version 18.0

ISO/IEC recommendation MPEG-4 Visual (JTC1/SC29/WG11 N3908). Approved January 2001.

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Posted in July 2nd, 2007

H.263 : Video coding for low bit rate communication

ITU-T recommendation H.263. Approved in January 2005.

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Posted in July 2nd, 2007

H.264 : Advanced video coding for generic audiovisual services

ITU-T recommendation H.264. Approved in March 2005.

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Posted in July 2nd, 2007

The H.264/AVC Advanced Video Coding Standard: Overview and Introduction to the Fidelity Range Extensions

by Gary J. Sullivan, Pankaj Topiwala, and Ajay Luthra. Overview of H.264/AVC standart.

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Posted in July 2nd, 2007

JPEG 2000 Tools 2.0

Developed in the scope of MIGRATOR 2000 project (, this site presents a graphical user interface to the three currently available codecs (VM, JJ2000, Jasper) as well as validation and parsing services to J2k codestreams and JP2 files.
It’s currently a widely used tool within WG1 (JPEG) to perform compliance tests on coders and codestreams. Site requires free registration for purposes of tracking stored images.

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Posted in January 23rd, 2004

JPEG 2000 Part 6 Final Committee Draft

Published in Standards, JPEG-2000

JPEG 2000 Part 6 refers to the standard for compound documents.


Posted in July 6th, 2003

OpenDML AVI File Format Extensions

Published in MJPEG, Standards, JPEG

This document describes the proposed format of the OpenDML compliant AVI extensions, specifically for the Motion JPEG DIB AVI file. This format is an extension to the AVI M-JPEG DIB as defined in the JPEG DIB FORMAT technical note from Microsoft. The format is based on the ISO 10918 defined JPEG format.

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Posted in February 3rd, 2003

Recommendation for Space Data Systems Standards

This appears to be the Data Compression Blue Book published by the Consultative Committee for Space Data Systems. It’s a nice document, but I’m not sure if the standard described here is actually in use. As is so often the case with standards documents, I find myself yearning for some accompanying reference code. Alas, there is none that I know of.

Note: a related document discussing performance characteristics of the recommendate can be found



Posted in January 19th, 2003

JPEG 2000 Metadata

Published in Standards, JPEG-2000

Links to information on JPEG 2000 metadata, include the XML DTD and Schema for the JPEX metadata set.


Posted in January 19th, 2003

The AC3 Audio Compression Standard

Published in Standards, Audio

This is a copy of the AC3 Audio compression standard from the Advanced Television Systems Committee (ATSC.) It’s nice to see a standards committee that is able to make their documents freely available to the public.


Posted in January 19th, 2003

DVCAM Format Overview

Published in Standards, Video

Sony’s document gives a concise description of DV format video, ranging from mechanical specifications to the details of the compression format. Read this and you will feel like a DV expert.


Posted in January 19th, 2003

ITU Recommendation V.44

This is the data compression standard that implements the LZJH algorithm, and is used in V.90 and V.92 modems. The ITU wants to charge you a few bucks for this standard, but if you believe the post from Pete Fraser (listed elsewhere on you can get three free standards per year. Maybe this ought to be one of them.


Posted in November 9th, 2002

Windows GDI Bitmap Compression

A description of the format used to implement bitmap compression under Windows.

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Posted in October 12th, 2002

The VCDIFF Generic Differencing and Compression Data Format

A format that can be used to send the differences between documents with some efficiency. This is part of a proposed extension to the HTTP standard.


Posted in September 29th, 2002

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.


Posted in September 15th, 2002

Draft ITU Standards

Published in Standards, Video

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.

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Posted in September 15th, 2002

LHA 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.


Posted in September 15th, 2002

Real embraces open-source Ogg Vorbis

Published in Standards, Audio

Real Networks is going to add support for the Ogg Vorbis audio format in their client software, ZDNet reports. This could go a long way towards legitimizing the upstart competitor to MP3.


Posted in August 8th, 2002

VCEG ftp server

Published in Files, Standards, Video

This is described as the ftp server for the Video Coding Experts Group, which is working on H.26L and other video projects. A ton of stuff here, no guideposts or indices, have at it.


Posted in June 6th, 2002

The CWI Audio File Formats Guide

Published in Links, Standards, Audio

Useful links to information describing audio file formats.


Posted in June 5th, 2002

HP Labs LOCO-I/JPEG-LS Home Page

JPEG-LS is the new lossless/near-lossless compression standard for continuous-tone images developed by ISO/IEC JTC1/SC29/WG1 (final draft international standard FDIS14495-1 as of Novembr 1998). The standard is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard Laboratories

Update: The HP site has just added a JPEG-LS plugin for Photoshop, in addition to the HP implementation that has been there for some time.

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Posted in April 17th, 2002

JBIG Standard - ITU T.82

Published in Standards, JBIG

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?)

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Posted in March 21st, 2002

JBIG files

Here you will find information and tools related to the JBIG
arithmetic lossless bi-level image compression algorithm.

This includes the JBIG kit, which is a free C lossless image compresion library that conforms to the JBIG specification.

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Posted in February 7th, 2002

RFC 2190 - RTP Payload Format for H.263 Video Streams

Published in Standards, Video

The IETF standard for delivering H.263 in RTP packet streams.


Posted in January 27th, 2002

RFC 2429 - RTP Payload Format for H.263+ Video Streams

Published in Standards, Video

The second generation fo H.263 is working on supplanting the original. Naturally, we need a standard for sending H.263v2 packets over RTP streams.


Posted in January 27th, 2002

ITU Standard : H.263

Links to the various parts of the H.263 standard on the ITU page. Get out your credit card if you want a copy - the ITU doesn’t give things away!


Posted in January 27th, 2002

Delta encoding in HTTP

Published in Standards, Internet

A draft proposal for delta encoding for text sent via HTTP.


Posted in December 30th, 2001

GIF89a Animation Browser Test

These pages will test the various features available for GIF89a animation. Each feature is tested as independently as possible, allowing you to identify what features your browser supports and how well. The pages isolate features to prevent combination collisions (one error causing another feature to fail). Each test is composed of an animation that tests the most basic quality of the function.


Posted in December 7th, 2001

GIF87A Specification

This is a copy of the original GIF specification from CompuServe. It was expanded significantly by the 1989 specification.


Posted in December 7th, 2001