bash substitution - Stepmania song ffmpeg convert

./WIP_-_All_Others/Trapped In The Drive-Thru_-_Weird_Al_Yankovic/'Weird Al' Yankovic - Trapped In The Drive-Thru (Official Video)-SHnTocdD7sk.m4a


${line##.*/} - filename
'Weird Al' Yankovic - Trapped In The Drive-Thru (Official Video)-SHnTocdD7sk.m4a


${line%/*} - folderpath
./WIP_-_All_Others/Trapped In The Drive-Thru_-_Weird_Al_Yankovic


ffmpeg -hide_banner -i "$line" -c:a libmp3lame -b:a 128k "$FOLDERNAME/${FNAME// /_}"


while read line; do FNAME=$(echo ${line##.*/}); FOLDERNAME=$(echo ${line%/*}); ffmpeg -hide_banner -i "$line" -c:a libmp3lame -b:a 128k "$FOLDERNAME/${FNAME// /_}.mp3" ;done