Projects tagged ‘compression’

7-zip

7-Zip is a file archiver with high compression ratio. The main features of 7-Zip * High compression ratio in new 7z format with LZMA compression * Supported formats: o Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR ... [More] o Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS * For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip * Self-extracting capability for 7z format * Integration with Windows Shell * Powerful File Manager * Powerful command line version * Plugin for FAR Manager * Localizations for 63 languages [Less]

bzip2

bzip2 is a freely available, patent free, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.

LAME (Lame Ain't an MP3 Encoder)

LAME (LAME Ain't an MP3 Encoder) is a research project for learning about and improving MP3 encoding technology. LAME includes an MP3 encoding library, simple frontend application, a much-improved psycho-acoustic model (GPSYCHO), and a graphical ... [More] frame analyzer (MP3x). Please note that any commercial use (including distributing the LAME encoding engine in a free encoder) may require a patent license from Thomson Multimedia. [Less]

Metrics updated 06 Oct 08

FLAC - Free Lossless Audio Codec

FLAC is a Free Lossless Audio Codec. The FLAC format supports streaming, seeking, and archival, and gives 25-75% compression on typical CD audio. Input plugins for Winamp and XMMS are also provided.

Metrics updated 07 Jun 08

libpng

libpng is the official PNG reference library. It supports almost all PNG features, is extensible, and has been extensively tested for over 12 years. libpng is available as ANSI C source code and requires zlib 1.0.4 or later (1.2.3 or 1.1.4 ... [More] recommended due to potential security vulnerabilities in earlier versions). In addition to the main library sources, libpng includes the rpng, rpng2 and wpng demo programs, the pngminus demo program, a subset of Willem van Schaik's PngSuite test images, Willem's VisualPng demo program, and Intel's MMX-optimized routines for faster decoding on x86-class CPUs (currently for Microsoft Visual C++ and GNU C only; the two versions are equivalent aside from a thread-safety issue in the latter port). [Less]

libjpeg

A widely used free library for JPEG image compression.

Metrics updated 10 Oct 08

p7zip

p7zip is a port of 7za.exe for POSIX systems like Unix (Linux, Solaris, OpenBSD, FreeBSD, Cygwin, AIX, ...), MacOS X and BeOS. 7za.exe is the command line version of 7-zip, see http://www.7-zip.org/. J7zip is a JAVA port of 7zr.exe

gzip

gzip (GNU zip) is a compression utility designed to be a replacement for compress. Its main advantages over compress are much better compression and freedom from patented algorithms. It has been adopted by the GNU project and is now relatively popular on the Internet.

Metrics updated 06 Oct 08

Speex

Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex project provides a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs.

Metrics updated 03 Sep 08

zlib

zlib is designed to be a free, general-purpose, legally unencumbered -- that is, not covered by any patents -- lossless data-compression library for use on virtually any computer hardware and operating system. The zlib data format is itself portable ... [More] across platforms. Unlike the LZW compression method used in Unix compress(1) and in the GIF image format, the compression method currently used in zlib essentially never expands the data. (LZW can double or triple the file size in extreme cases.) zlib's memory footprint is also independent of the input data and can be reduced, if necessary, at some cost in compression. [Less]