x265 ffmpeg

EncodeFolder

FOR /F "tokens=*" %%G IN ('dir /b *.mp4') DO ffmpeg -i "%%G" -c:v libx265 -preset medium -x265-params crf=28 -c:a aac -strict -2 -b:a 128k "%%~nG.mkv"

EncodeSubfolders

@echo off
REM keep a counter for files converted
set /A nfile=0
REM do not copy empty folders or any files
@echo Copying directory structure from %0 to %1 ...
xcopy /T %1 %2
REM walk directory structure and convert each file in quiet mode
for /R %1 %%v in (*.mp4, *.mov, *.flv, *.wmv) do (
    echo converting "%%~nxv" ...
	ffmpeg -i "%%v" -c:v libx265 -preset medium -x265-params crf=28 -c:a aac -strict -2 -b:a 128k "%%~dpnv.mkv"
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)