video2gif.bat

@if [%6]==[] goto error
@goto ok

:error
@echo USAGE: video2gif START_TIME DURATION WIDTH FRAME_RATE (DITHER_OPTIONS) (CROP_RECTANGLE width:height:x:y) INPUT OUTPUT
@goto end

:ok
@set PALETTE="%TEMP%\palette.png"

@set START_TIME=%1
@set DURATION=%2
@set WIDTH=%3
@set FRAME_RATE=%4

@if [%7]==[] goto dither_omitted

@if [%8]==[] goto dither_specified

:crop_specified
set DITHER_OPTIONS=%5
set CROP_RECTANGLE=crop=%6,
@set INPUT=%7
@set OUTPUT=%8

@goto who_cares

:dither_specified
set DITHER_OPTIONS=%5
@set CROP_RECTANGLE=
@set INPUT=%6
@set OUTPUT=%7

@goto who_cares

:dither_omitted
@set DITHER_OPTIONS=dither=bayer:bayer_scale=4
@set CROP_RECTANGLE=
@set INPUT=%5
@set OUTPUT=%6

@goto who_cares

:who_cares
@set PALETTEUSE=%DITHER_OPTIONS%:diff_mode=rectangle

@set FILTERS=fps=%FRAME_RATE%,%CROP_RECTANGLE%scale=%WIDTH%:-1:flags=lanczos

@set OPTS_PREFIX=-v warning -ss %START_TIME% -t %DURATION% -i %INPUT%

ffmpeg %OPTS_PREFIX% -vf "%FILTERS%,palettegen=stats_mode=diff" -y %PALETTE%
ffmpeg %OPTS_PREFIX% -i %PALETTE% -lavfi "%FILTERS% [x]; [x][1:v] paletteuse=%PALETTEUSE%" -y %OUTPUT%

:end