FLAC ↔ Free Lossless Audio Codec for bit-perfect audio copy with lossless compression. FOSS DRM-less. metadata

FLAC is FOSS alt to ALAC, WMA, WAV

References

1. ffmpeg -i input.mkv -map 0:V:0 -map 0:a:0 -c:v copy -c:a flac -compression_level:a 12 -f matroska output.mkv ↔ convert source MKV from DTSto FLAC