On Sun, Jan 25, 2015 at 07:55:17PM +0100, Clément Bœsch wrote: > Hi folks, > > I've been trying to improve GIF support even more recently. This is the > result: > http://lucy.pkh.me/gone-nutty-current.gif → http://lucy.pkh.me/gone-nutty.gif >
I added more here: http://lucy.pkh.me/gif-experiment/ with other dithering (in what is available currently): gif-experiment/bbb: total 119M -rw-r--r-- 1 ux ux 13M Jan 25 20:28 out-current-ad.gif -rw-r--r-- 1 ux ux 41M Jan 25 20:28 out-current-ed.gif -rw-r--r-- 1 ux ux 13M Jan 25 20:28 out-current.gif -rw-r--r-- 1 ux ux 14M Jan 25 20:28 out-current-xd.gif -rw-r--r-- 1 ux ux 40M Jan 25 20:28 out-dither.gif gif-experiment/gone-nutty: total 77M -rw-r--r-- 1 ux ux 6.5M Jan 25 20:19 out-current-ad.gif -rw-r--r-- 1 ux ux 29M Jan 25 20:19 out-current-ed.gif -rw-r--r-- 1 ux ux 6.1M Jan 25 20:18 out-current.gif -rw-r--r-- 1 ux ux 7.3M Jan 25 20:19 out-current-xd.gif -rw-r--r-- 1 ux ux 29M Jan 25 20:19 out-dither.gif gif-experiment/matrix: total 111M -rw-r--r-- 1 ux ux 12M Jan 25 20:22 out-current-ad.gif -rw-r--r-- 1 ux ux 36M Jan 25 20:22 out-current-ed.gif -rw-r--r-- 1 ux ux 14M Jan 25 20:22 out-current.gif -rw-r--r-- 1 ux ux 14M Jan 25 20:22 out-current-xd.gif -rw-r--r-- 1 ux ux 38M Jan 25 20:22 out-dither.gif So indeed, with the heckbert/floyd-steinburg dithering I implemented in paletteuse, the results are very similar in size with error diffusion dithering. The quality is IMO better with the palette though, except for a bug in BBB where it seems the palette has no black (so the opening fade in looks like shit). I used the following for testing: #!/bin/sh ./ffmpeg -i $1 -vf trim=start=$2:end=$3,palettegen -y palette.png filt="trim=start=$2:end=$3,scale=480:-1" ./ffmpeg -i $1 -lavfi $filt -y out-current.gif ./ffmpeg -i $1 -lavfi $filt:sws_dither=ed -y out-current-ed.gif ./ffmpeg -i $1 -lavfi $filt:sws_dither=a_dither -y out-current-ad.gif ./ffmpeg -i $1 -lavfi $filt:sws_dither=x_dither -y out-current-xd.gif ./ffmpeg -i $1 -i palette.png -lavfi $filt,paletteuse -y out-dither.gif -- Clément B.
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