wavpack

Hybrid Lossless Audio Compression Format

WavPack is an open audio compression format providing lossless, high-quality lossy, and unique hybrid compression modes. Lossless mode is ideal for archiving audio material or any other situation where quality is paramount. The compression ratio depends on the source material, but generally is between 30% and 70%. The hybrid mode creates both, a relatively small, high-quality lossy file that can be used all by itself, and a "correction" file that (when combined with the lossy file) provides full lossless restoration. For some users, this means never having to choose between lossless and lossy compression.