ReplayGain 2.0 loudness normalizer based on the EBU R128/ITU BS.1770 standard (-18 LUFS, FLAC, Ogg, MP2, MP3, MP4, M4A, AAC, ALAC, Opus, ASF, WMA, WAV, AIFF, WavPack, APE)

Advanced ReplayGain scanner and tagger

Apply replaygain tags to matroska files without remuxing (gain is calculated using ffmpeg and tags are applied using mkvpropedit).

multithreaded script to recursively recompress/verify flac files and calculate replaygain tags

Calculate Replay Gain tags based on the stat mtime of files