OptimFROG helps you reduce the memory space occupied by your music collection and also to restore the original files, using a method similar to ZIP compression.
It provides one of the best lossless audio compression ratios.

OptimFROG has an impressive list of features, which includes:

Win32 and Linux command-line versions; input plugins for Winamp, foobar2000, dBpowerAMP, XMMS and XMPlay; full raw file support; 64 bits large file support under Win32; full pipe support for encoding and decoding; fast seeking with intelligent caching for plugins, multiple file processing on the same command line using wildcards, and ReplayGain compatible plugins for foobar2000 and Winamp.

The audio compression technology used by OptimFROG is the generalized stereo decorrelation concept, together with the optimal predictor, which was first used by the 4.0b version of OptimFROG in 2001.

The compression rates obtained with OptimFROG are more than satisfactory: from 25% (classical music) to 70% (loud rock music) of the original file size. High-quality MP3s manage to obtain about 13% of the original file size, but on the other hand, the copies created by OptimFROG are perfect and there is no quality difference between the original and the output files.

The last version of OptimFROG was 5.002a, and the changes it featured were several new supported platforms, including SSE2 enabled builds; a large number of internal code updates and improvements; various speed improvements for all compression modes; updated SDK layout, documentation, and website content; a new unified, simplified, and more permissive license.

OptimFROG is a complex command-line application which produces one of the best lossless audio compression ratios. This tool is recommended to expert users, who know how to use all the advanced features provided by OptimFROG.

OptimFrog for Winamp: Winamp 2/5 plug-in.

OptimFROG Lossless/DualStream input plug-in: for foobar2000, with cue sheet support.

RadLight OptimFrog DirectShow decoder filter: enables playback of OFR (OptimFROG) encoded files in RadLight or any other DirectShow based player.

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