@ECHO OFF
SET HOMEDIR=%~dp0
REM SET %MKVTOOLPATH=C:\Program Files\MKVToolnix
SET KEY="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\mmg.exe"
FOR /F "tokens=2*" %%A IN ('REG QUERY %KEY%') DO SET MKVTOOLPATH=%%B
IF "%MKVTOOLPATH%" == "" (
DIR "%HOMEDRIVE%\mkvmerge.exe" /s /b >"%HOMEDIR%findmkvmerge"
SET /P MKVTOOLPATH=<"%HOMEDIR%findmkvmerge"
DEL "%HOMEDIR%findmkvmerge"
)
IF "%MKVTOOLPATH%" == "" (
ECHO MKVToolnix NOT found!!!>"%HOMEDIR%logging.txt"
GOTO STATUS
) ELSE (
ECHO MKVToolnix found at "%MKVTOOLPATH%">"%HOMEDIR%logging.txt"
ECHO.>>"%HOMEDIR%logging.txt"
)

:STARTFILES
IF "%~dpnx1" == "" GOTO DRAGDONE
ECHO PROCESSING ALL FILES DRAGGED AND DROPPED!!
ECHO PROCESSING ALL FILES DRAGGED AND DROPPED>>"%HOMEDIR%logging.txt"
ECHO.>>"%HOMEDIR%logging.txt"
SET dropped=yes
CALL :MKVFIXMUX %1 "%MKVTOOLPATH%"
SHIFT
GOTO STARTFILES

:DRAGDONE
IF "%dropped%" == "yes" GOTO STATUS
ECHO PROCESSING ALL FILES IN THIS DIRECTORY AND ALL SUBDIRECTORIES!!
ECHO PROCESSING ALL FILES IN THIS DIRECTORY AND ALL SUBDIRECTORIES>>"%HOMEDIR%logging.txt"
ECHO.>>"%HOMEDIR%logging.txt"
FOR /F "delims=*" %%A IN ('dir /b /s *.MKV') do CALL :MKVFIXMUX "%%A" "%MKVTOOLPATH%"

:STATUS
START "" "%HOMEDIR%logging.txt"
ping 1.1.1.1 -w 1000 -n 2$1>nul
del "%HOMEDIR%logging.txt"
GOTO END

:MKVFIXMUX
"%~dp2mkvmerge.exe" -o "%~dpn1_fix.MKV" -A -S --compression -1:none "%~dpnx1" -D -S --compression -1:none "%~dpnx1" -A -D "%~dpnx1">>"%HOMEDIR%logging.txt"
if not errorlevel 0 (
ECHO FAILED! on "%~dpnx1" remux!>>"%HOMEDIR%logging.txt"
)
if exist "%~dpn1_fix.MKV" (
del "%~dpnx1"
rename "%~dpn1_fix.MKV" "%~nx1"
ECHO SUCCESSFUL! processing of "%~dpnx1">>"%HOMEDIR%logging.txt"
)

:END