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FFMPEG:https://ffmpeg.org/
@echo off
SETLOCAL ENABLEDELAYEDEXPANSION
set path=.\m4a
set rs=.\mp3
for /F %%i in ('Dir /B %path%') do (
set name=%%i
start /B .\ffmpeg.exe -i "%path%\!name!" -ab 64k ".\%rs%\!name:~0,-5!.mp3" -y
)
pause
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