setlocal enabledelayedexpansion

set VLCEXE="C:\Program Files\VideoLAN\VLC\vlc.exe"
set InputFileExtension=mp4
set OutFolder=

pushd %~dp0
if "!OutFolder!" NEQ "" (
	if not exist "!OutFolder!" (
		mkdir !OutFolder!
	)
)
set Dist=!OutFolder!
for %%a in (%*) do (
	if %%~xa==.!InputFileExtension! (
		if "!OutFolder!"=="" set Dist=%%~dpa
		cmd /c
		!VLCEXE! -I dummy -vvv %%a --sout #transcode{vcodec=h264,scale=auto,acodec=mpga,ab=128,channels=2,samplerate=44100,soverlay}:file{dst=!Dist!\sub_%%~na.mp4,no-overwrite} :no-sout-all :sout-keep vlc://quit
	)
)
popd
exit