Bash script (using ffmpeg) for encoding directories with audio files
to other formats, including MP3, AAC, OGG Vorbis, OPUS, AC3, EAC3, DTS,
FLAC, ALAC, Wavpack, AIFF, and WAV.

Auto-copies metadata and cover art for MP3/AAC/FLAC/ALAC/AIFF.

Optional dependencies:

faac or fdkaac and libfdk-aac (for AAC)
aften (for AC3)
dcaenc (for dts, note: this is a legal quagmire)