Generate a slideshow video from images in a folder using ffmpeg

FFMPEG_GENERATEVIDEOFROMIMAGES.bat

:: Generate a Video Slideshow from images in a folder on Windows
:: that's optimized for current system's screen resolution
:: Make sure your Images, ffmpeg executables, and this batch file are in the same folder
:: The images should be ".jpg" format, or you may change in the script below
:: Make sure to download ffmpeg: https://www.ffmpeg.org/download.html
:: Command Line executable code

:: Begin by getting the framerate. ex: 1/2
:: This determines time span for each image to display
:: And load the images in the current directory
@echo off
echo Let's get started!
set /p framerate=Enter framerate:
:: Generate a temp file that include list of images
for /r %%a in (*.jpg) do (
    echo file '%%a' >> temp_imageslist.txt
)

:: Retrieve system screen resolution
for /f "delims=" %%# in  ('"wmic path Win32_VideoController  get CurrentHorizontalResolution,CurrentVerticalResolution /format:value"') do (
  set "%%#">nul
)
echo Screen Resolution detected: 
echo [%CurrentHorizontalResolution% x %CurrentVerticalResolution%]

:: Execute ffmpeg magic!
ffmpeg.exe -y -r %framerate% -f concat -safe 0 -i temp_imageslist.txt  -vf scale=(iw*sar)*min(%CurrentHorizontalResolution%/(iw*sar)\,%CurrentVerticalResolution%/ih):ih*min(%CurrentHorizontalResolution%/(iw*sar)\,%CurrentVerticalResolution%/ih),pad=%CurrentHorizontalResolution%:%CurrentVerticalResolution%:(%CurrentHorizontalResolution%-iw*min(%CurrentHorizontalResolution%/iw\,%CurrentVerticalResolution%/ih))/2:(%CurrentVerticalResolution%-ih*min(%CurrentHorizontalResolution%/iw\,%CurrentVerticalResolution%/ih))/2   -c:v libx264  -r 30 -pix_fmt yuv420p SlideshowVideo.mp4
:: We're setting the scaling of the images safely without disturbing its aspect ratio ;) 
:: -y ~ override if the output file already exists
:: -safe 0 ~ Ignore unsafe file names
:: -r 30 ~ Frames Per Second during playback 

:: Delete generated temp file
del /q temp_imageslist.txt

:: Used Resources: 
:: Base Tutorial: https://trac.ffmpeg.org/wiki/Slideshow
:: Helped me fix image resoulution problem: https://superuser.com/questions/891145/ffmpeg-upscale-and-letterbox-a-video