Add script from "blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html"

gifgen

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+palette="/tmp/palette.png"
+
+filters="fps=15,scale=320:-1:flags=lanczos"
+
+ffmpeg -v warning -i $1 -vf "$filters,palettegen" -y $palette
+ffmpeg -v warning -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $2