"if not exist" with "goto" isn't working (just skips) and "else" variant also not working (Windows batch file)

I'm trying to create commands in a batch file where, if a certain nVidia file exists, it will encode a video using the graphics card - but if that nVidia file isn't there, it skips to another label to use another command.

This doesn't skip to the :SOFTWARE_ENCODE label if nvcuda.dll does not exist at the location:

if exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" goto :NVIDIA_ENCODE
if not exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" goto :SOFTWARE_ENCODE

If nvcuda.dll does exist then the above works and it skips to the :NVIDIA_ENCODE label.

I Googled around and saw someone solve it by using else with parentheses but that also doesn't work:

if exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" (goto NVIDIA_ENCODE) else goto SOFTWARE_ENCODE

The same result happens, it seems to just skip the rest of the batch file if nvcuda.dll does not exist.

I know both nVidia encode and software encode work to encode the video because I have commented out the if exist and if not exist parts, testing each (ffmpeg) encode command individually.

(I'm renaming nvcuda.dll to ".bak" when testing the software encode).

I remember this happening in the past and have no idea why it ignores goto if used with if not exist.

Any solution is greatly appreciated.

EDIT: Here's the whole batch file...

if not DEFINED IS_MINIMIZED set IS_MINIMIZED=1 && start "" /min "%~dpnx0" %* && exit
:: ------------------------------------------------------------------------------
:: This part swaps the first and last 4 characters around...
:: (This processes all files in sub-folders, but I want to make it only process files next to the batch file)...
setlocal enabledelayedexpansion
echo.
for /f "delims= eol=:" %%f in ('dir /b /a-d G???????*.* ????G???*.*') do (
set filename=%%~nf
set firstfour=!filename:~0,4!
set secondfour=!filename:~4,4!
echo %%f ^> !secondfour!!firstfour!!filename:~8!%%~xf
ren %%f !secondfour!!firstfour!!filename:~8!%%~xf
)
set /a Index=1
:: ------------------------------------------------------------------------------
:: This part renames the files 001, 002, 003 and so on.
for /r %%i in (*.mp4) do ( rem if number is less than 10, append 9 to file name if !Index! lss 10 ( rename "%%i" 00"!Index!.mp4" ) else ( rename "%%i" "0!Index!.mp4" ) set /a Index+=1
)
:: ------------------------------------------------------------------------------
:: Delete junk files...
del "*.LRV"
del "*.THM"
:: ------------------------------------------------------------------------------
rem Create TEMP folder for files to be created in...
if not exist "TEMP" md "TEMP"
:: ------------------------------------------------------------------------------
:: Use nVidia to encode if that driver file is installed...
:: Not working, but will work if nvcuda.dll is there...
:: if exist %SYSTEMDRIVE%\Windows\System32\nvcuda.dll (goto NVIDIA_ENCODE) else goto SOFTWARE_ENCODE
:: Original lines also not working...
if exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" goto :NVIDIA_ENCODE
if not exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" goto :SOFTWARE_ENCODE
:: ------------------------------------------------------------------------------
:: Convert to 1080p...
:NVIDIA_ENCODE
rem Convert video files...
FOR /F "tokens=*" %%G IN ('dir /b *.mp4') DO start /wait /min ffmpeg.exe -y -i "%%G" -vcodec hevc_nvenc -vf scale=1920:-2,fps=23.976 -b:v 4000k -acodec aac -b:a 192k -ar 44100 -ac 2 "TEMP\%%~nG.mp4" -hide_banner
goto :JOIN_FILES
:SOFTWARE_ENCODE
rem Convert video files...
FOR /F "tokens=*" %%G IN ('dir /b *.mp4') DO start /wait /min ffmpeg.exe -y -i "%%G" -vcodec libx265 -vf scale=1920:-2,fps=23.976 -b:v 4000k -acodec aac -b:a 192k -ar 44100 -ac 2 "TEMP\%%~nG.mp4" -hide_banner
goto :JOIN_FILES
:: ------------------------------------------------------------------------------
:: Join the files into one video...
:JOIN_FILES
(for %%i in (TEMP\*.mp4) do @echo file '%%i') > mp4_file_list.txt
For %%a IN ("TEMP\*.mp4") DO Set "mp4file=%%~na"
start /wait /min ffmpeg.exe -y -f concat -safe 0 -i mp4_file_list.txt -c copy "%mp4file%_JOINED.mp4" -hide_banner
del mp4_file_list.txt
:: ------------------------------------------------------------------------------
:: Delete the TEMP folder...
rd /s /q "TEMP\"
:: ------------------------------------------------------------------------------
:: Rename the "*_JOINED.mp4" file with todays date and " - GoPro Video" at the end.
:: (The dating method follows the format: YYYY-MM-DD) [May not work on non-UK systems]
For /f "tokens=1-3 delims=/ " %%a in ('date /t') do (set mydate=%%c-%%b-%%a)
ren "*_JOINED.mp4" "%mydate% - GoPro Video.mp4"
:: Create a folder "Converted Video" and move the newly converted video file to it.
if not exist "Converted Video" md "Converted Video"
MOVE /Y "%mydate% - GoPro Video.mp4" "Converted Video"
:: ------------------------------------------------------------------------------
:: Rename any old files back to mp4 again that got moved/renamed at the start...
for /r %%x in (*.S6C8JHVH2E7L4BX9) do ren "%%x" *.mp4
:: ------------------------------------------------------------------------------
:: Open folder with finished video...
explorer "Converted Video"
:: ------------------------------------------------------------------------------
exit

If I run this on its own with an MP4 in the folder then it does work:

:: ------------------------------------------------------------------------------
:: Use nVidia to encode if that driver file is installed...
if exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" goto :NVIDIA_ENCODE
if not exist "%SYSTEMDRIVE%\Windows\System32\nvcuda.dll" goto :SOFTWARE_ENCODE
:: ------------------------------------------------------------------------------
:: Convert to 1080p...
:NVIDIA_ENCODE
rem Convert video files...
FOR /F "tokens=*" %%G IN ('dir /b *.mp4') DO start /wait /min ffmpeg.exe -y -i "%%G" -vcodec hevc_nvenc -vf scale=1920:-2,fps=23.976 -b:v 4000k -acodec aac -b:a 192k -ar 44100 -ac 2 "TEMP\%%~nG.mp4" -hide_banner
goto :JOIN_FILES
:SOFTWARE_ENCODE
rem Convert video files...
FOR /F "tokens=*" %%G IN ('dir /b *.mp4') DO start /wait /min ffmpeg.exe -y -i "%%G" -vcodec libx265 -vf scale=1920:-2,fps=23.976 -b:v 4000k -acodec aac -b:a 192k -ar 44100 -ac 2 "TEMP\%%~nG.mp4" -hide_banner
goto :JOIN_FILES
:: ------------------------------------------------------------------------------
:JOIN_FILES
exit

I have tried using pause but to no avail.

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