batch ffmpeg convert mp4 mp3

Not my best FOR loop, quick and nasty.
Had a stack of mp4 videos to convert for the ride home.

mp4mp3.cmd <batch file>

for /f "delims=." %%a in ('dir *.mp4 /b') do G:\music\ffmpeg.exe -i "%%a.mp4" -vn -ar 44100 -ac 2 -ab 192000 -f mp3 "%%a.mp3"