Better Batch

dir/b/s *.mkv > mkvlist.txt
SET /P _driveletter= Please enter drive letter:
for /F "delims=;" %%F in (mkvlist.txt) do mkdir "%_driveletter%:%%~pF" && ffmpeg -i "%%F" -c:v libx264 -preset fast -crf 20 -acodec aac "%_driveletter%:%%~pF%%~nF.mp4"
del mkvlist.txt
pause