cd %~dp0
mkdir converted
for /f "delims=" %%A in ('dir *.rmvb /b /a-d-h-s') Do (ffmpeg -i  %%A  "converted/%%~nA.avi" )
 
 
 REM ffmpeg -i  %%A  %%~nA.avi
 REM echo %%A   %%~nA.avi