GIF.bat

@ECHO OFF

REM This creates GIF files with 15 fps and a width of 320 pixel. The height is auto (-1)
REM change the values in the FILTER value if needed.

SETLOCAL
PUSHD "%~dp0"
IF "%~1"=="" GOTO HELP
SET FILTER=fps=15,scale=320:-1:flags=lanczos


:LOOP
SET TMPPAL=%RANDOM%
FFMPEG -i "%~1" -vf "%FILTER%,palettegen" -y %TMPPAL%.PNG
FFMPEG -i "%~1" -i %TMPPAL%.PNG -lavfi "%FILTER% [x]; [x][1:v] paletteuse" -gifflags +transdiff -y "%TMPPAL%.gif"
DEL %TMPPAL%.PNG

SHIFT
IF "%~1"=="" GOTO END
GOTO LOOP

:HELP
ECHO Help
GOTO END

:END
POPD
ENDLOCAL