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2. Data compression - Wikipedia

   en.wikipedia.org/wiki/Data_compression

   Introduction to Compression Theory (PDF), Wiley, archived (PDF) from the original on 2007-09-28; EBU subjective listening tests on low-bitrate audio codecs; Audio Archiving Guide: Music Formats (Guide for helping a user pick out the right codec) MPEG 1&2 video compression intro (pdf format) at the Wayback Machine (archived September 28, 2007)

3. Lossless compression - Wikipedia

   en.wikipedia.org/wiki/Lossless_compression

   The "trick" that allows lossless compression algorithms, used on the type of data they were designed for, to consistently compress such files to a shorter form is that the files the algorithms are designed to act on all have some form of easily modeled redundancy that the algorithm is designed to remove, and thus belong to the subset of files ...

4. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   MPEG-4 video file 78 01: x␁ 0 zlib No Compression (no preset dictionary) 78 5E: x^ Best speed (no preset dictionary) 78 9C: xœ: Default Compression (no preset dictionary) 78 DA: xÚ: Best Compression (no preset dictionary) 78 20: x␠ No Compression (with preset dictionary) 78 7D: x} Best speed (with preset dictionary) 78 BB: x»

5. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   The replacement for the .sit format that supports more compression methods, UNIX file permissions, long file names, very large files, more encryption options, data specific compressors (JPEG, Zip, PDF, 24-bit image, MP3). The free StuffIt Expander is available for Windows and OS X. .sqx SQX: Windows: Windows: Yes A royalty-free compressing format

6. zstd - Wikipedia

   en.wikipedia.org/wiki/Zstd

   It is tunable with compression levels ranging from negative 7 (fastest) [6] to 22 (slowest in compression speed, but best compression ratio). Starting from version 1.3.2 (October 2017), zstd optionally implements very-long-range search and deduplication ( --long , 128 MiB window) similar to rzip or lrzip .

7. PAQ - Wikipedia

   en.wikipedia.org/wiki/PAQ

   PAQ7 is a complete rewrite of PAQ6 and variants (PAQAR, PAsQDa). Compression ratio was similar to PAQAR but 3 times faster. However it lacked x86 and a dictionary, so it did not compress Windows executables and English text files as well as PAsQDa. It does include models for color BMP, TIFF and JPEG files, so compresses these files better.