-vf "split[a][b];[a]palettegen=stats_mode=diff[p];[b][p]paletteuse=new=1:diff_mode=rectangle"
-f gif
-an
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,,24,&H00FFFFFF,&H0000FFFF,&H00000000,&H80000000,-1,0,0,0,100,100,0,0,1,1.5,2.0,2,10,10,20,1
False
7
5
5
0
0
1
1
9
1
True
True