dab test.sh

#! /bin/bash
filename="$1"
name=$(basename "$filename" .flac)
mp2br=( 80 128 160 192 )
aacbr=( 40 32 24 )
opus=("${mp2br[@]}" "${aacbr[@]}")

echo "Generating MP2 files:"
for br in "${mp2br[@]}"; do
    echo "Converting to mp2 at $br k"
    ffmpeg -i "$filename" -c:a mp2 -b:a "$br"k "$name ($br k).mp2"
done

echo "Generating AAC files:"
for br in "${aacbr[@]}"; do
    echo "Converting to aac at $br k"
    flac -d -c "$filename" | fdkaac - -p 29 -b $br -o "$name($br k).aac"
done
echo "Generating opus files:"
for br in "${opus[@]}"; do
    echo "Converting to opus at $br k"
    opusenc --bitrate $br --cvbr --music "$filename" "$name($br k).ogg"
done