my case loop never ends

Friends,

My goal is to have a script where I can choose 3 different values for a var.
the var is a number , a datarate for making mp3

I have tried case
this works out
!!BUT
after the script 'finishes"
meaning
I can select a choice
that choice is a worthy var and I have made my mp3
the script does not - exit it returns to a prompt of
#?
and if I hit enter
i get the case menu selection again , and again until i do a cntrl c

here are my 2 efforts
vers1 just a case selection
vers2 a case selection nested in a do while ...that i hoped would fix it

----------:: v1 start
: 1



#!/bin/bash
## audio_defineDR_mp3.sh
PS4="Please select a data rate for your file "
select option in 128 192 256 quit
do
case $option in
128)
dr=128k
echo "128";;
192)
dr=192k
echo "192";;
256)
dr=256k
echo "256";;
quit)
break;;
esac
#done

ffmpeg -i /media/j/data/z/1.wav -codec:a libmp3lame -b:a $dr /media/j/data/z/1.mp3
echo finshed we hope ok
done




==================



v2--start





#!/bin/bash
## audio_defineDR_mp3.sh
select=0
while [ $select -eq 0 ]; do
#echo The count is $select

PS4="Please select a data rate for your file "
select option in 128 192 256 quit
do
case $option in
128)
dr=128k
let select=select+1
echo "128";;
192)
dr=192k
let select=select+1
echo "192";;
256)
dr=256k
let select=select+1
echo "256";;
quit)
break;;
esac
#done
echo $select
ffmpeg -i /media/j/data/z/1.wav -codec:a libmp3lame -b:a $dr /media/j/data/z/1.mp3
echo finshed we hope ok
done
done

-v2 end

I am on ubuntu 18.04

thanks in advance!

Because that's how select works.
See:

help select

If you want to quit after the ffmpeg command, simply add 'exit':

...
ffmpeg -i /media/j/data/z/1.wav -codec:a libmp3lame -b:a $dr /media/j/data/z/1.mp3
echo finshed we hope ok
exit
...

exit is a bit drastic.
break is enough to end the loop.
Indeed it makes you v1 script work as intended (I think).
A select loop is only ended with break.

You can enhance your script with

*)
continue;;

Before the esac

you can enhance your posting by putting [/code] after your code ends and putting [code] before your code begins.

like
this
    and
        you
            can
                indent,
                    too