@echo off
setlocal EnableDelayedExpansion
if "%~1"=="" (
  echo Drop one or more video files onto this script.
  echo.
  echo Output:
  echo   .mov/.mkv/etc. -^> same name .mp4 next to source
  echo   .mp4          -^> same name _nvenc.mp4 ^(avoids overwriting source^)
  pause
  exit /b 1
)

:loop
if "%~1"=="" goto done

set "IN=%~f1"
set "OUT=%~dp1%~n1.mp4"
if /i "%~x1"==".mp4" set "OUT=%~dp1%~n1_nvenc.mp4"

echo.
echo IN : "!IN!"
echo OUT: "!OUT!"

ffmpeg -hide_banner -y -hwaccel cuda -i "!IN!" -c:v h264_nvenc -preset p7 -tune hq -rc vbr -cq 0 -b:v 0 -maxrate 1000k -bufsize 2000k -pix_fmt yuv420p -c:a aac -b:a 96k -movflags +faststart "!OUT!"
if errorlevel 1 (
  echo FAILED: %~nx1
) else (
  echo OK: %~nx1
)

shift
goto loop

:done
echo.
echo All jobs finished.
pause