Lossless compression | Wikipedia audio article

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Lossless_compression


00:01:48 1 Lossless compression techniques
00:04:33 1.1 Multimedia
00:06:36 1.2 Historical legal issues
00:10:05 2 Lossless compression methods
00:10:49 2.1 General purpose
00:12:25 2.2 Audio
00:13:45 2.3 Graphics
00:14:53 2.4 3D Graphics
00:15:09 2.5 Video
00:15:22 2.6 Cryptography
00:16:14 2.7 Genetics and Genomics
00:17:52 2.8 Executables
00:18:38 3 Lossless compression benchmarks
00:25:14 4 Limitations
00:32:08 4.1 Mathematical background
00:33:12 4.2 Psychological background
00:33:53 4.3 Points of application in real compression theory
00:35:11 4.4 The Million Random Digit Challenge



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SUMMARY
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Lossless compression is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data. By contrast, lossy compression permits reconstruction only of an approximation of the original data, though usually with improved compression rates (and therefore reduced file sizes).
Lossless data compression is used in many applications. For example, it is used in the ZIP file format and in the GNU tool gzip. It is also often used as a component within lossy data compression technologies (e.g. lossless mid/side joint stereo preprocessing by MP3 encoders and other lossy audio encoders).
Lossless compression is used in cases where it is important that the original and the decompressed data be identical, or where deviations from the original data would be unfavourable. Typical examples are executable programs, text documents, and source code. Some image file formats, like PNG or GIF, use only lossless compression, while others like TIFF and MNG may use either lossless or lossy methods. Lossless audio formats are most often used for archiving or production purposes, while smaller lossy audio files are typically used on portable players and in other cases where storage space is limited or exact replication of the audio is unnecessary.