for file in *.wma; do ffmpeg -i "${file}" -acodec flac "${file/.wma/.flac}"; done
for file in *.wma; do ffmpeg -i "${file}" -acodec libmp3lame -ab 192k "${file/.wma/.mp3}"; done
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https://unix.stackexchange.com/questions/415477/lossless-audio-conversion-from-flac-to-alac-using-ffmpeg