Extracts a number of images sequentially aligned in a horizontal strip of slides into seperate files (e.g. for Instagram Slides). Requires FFMPEG!

build_instagram_slides.bat

@echo off

:: Check for arguments
IF [%1]==[] GOTO USAGE
IF [%2]==[] GOTO USAGE
IF [%3]==[] GOTO USAGE

:: Arguments
SET "input=%1"
SET "inputName=%~n1"
SET "outputDir=%2"
SET /A slideCount=%3

:: Remove quotation marks
SET input=%input:"=%
SET inputName=%inputName:"=%
SET outputDir=%outputDir:"=%

:: Run ffmpeg
echo Extracting %slidecount% slides from "%input%" to "%outputDir%"

:: FFMPEG using the crop video filter (syntax is crop=w:h:x:y, iw and ih are "image width" and "image height")
"ffmpeg.exe" -loop 1 -i "%input%" -vf "crop=iw/%slideCount%:ih:n*(iw/%slideCount%):0" -vframes %slideCount% "%outputDir%/%inputName%_%%02d.png"
GOTO :EOF

:: Wrong usage
:USAGE
echo Invalid arguments!
echo Usage:
echo   "%0" "<input file>" "<output dir>" ^<slide count^>
exit /B 1