Convert flac audio to opus/ogg/mp3

Use GNU parallel and fmpeg command for convert flac audio files

Install need packages
apt install -y parallel ffmpeg

Convert to OPUS
parallel ffmpeg -y -i {} -map_metadata 0 -id3v2_version 3 {.}.opus ::: **/*.flac

Convert to OGG
parallel ffmpeg -y -i {} -map_metadata 0 -id3v2_version 3 {.}.ogg ::: **/*.flac

Conver to MP3
parallel ffmpeg -y -i {} -map_metadata 0 -id3v2_version 3 {.}.mp3 ::: **/*.flac