smss

@Echo off&SetLocal EnableDelayedExpansion
for /f "tokens=*" %%a in ('dir/a-d/b/oe *.mp4')do set/a c+=1&set a!c!=%%a&set b!c!=%%~za&set c!c!=%%~xa 
for /l %%a in (1,1,%c%)do set/a d=%%a+1&for /l %%b in (!d!,1,%c%)do if not !b%%a!.==. call :1 %%a %%b 
goto :eof 
:1 
if !b%1!==!b%2! if !c%1!==!c%2! set b%2=&del "!a%2!" 
goto :eof
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