GoKawiilBalrogg tool losslessly shrinks Vorbis and Opus audio files by up to 15%
A new open-source utility called balrogg recompresses existing Ogg Vorbis and Opus audio files without any loss of quality, typically shaving 8-12% off .ogg files and 3-8% off .opus files. The command-line tool, licensed under GPLv3 and hosted on GitHub, supports batch processing across multiple cores, adjustable compression effort levels from -1 to -9, and optional progress reporting during encoding and decoding.