On Thu, Jan 17, 2019 at 09:44:47AM +0100, Clément Bœsch wrote: > On Wed, Jan 16, 2019 at 01:40:20PM +0100, Tomas Härdin wrote: > > Hi > > > > I was helping the fine folks at peppercarrot.com with web video > > nonsense, and I notice palettegen outputs more colors than it should > > due to padding the generated palette with pure black. > > > > Compare this (ffmpeg version 3.2.12-1~deb9u1): > > http://www.härdin.se/files/peppercarrot_gif/output-blackspecks-64.gif > > with this (282a471 with this patch applied): > > http://www.härdin.se/files/peppercarrot_gif/output-fixed-64.gif > > > > The attached patch fixes this by padding with the last color instead of > > black. > > > > /Tomas > > > From 3a01f62fdcc95cc7afaf5aa6e439b8742cce43bc Mon Sep 17 00:00:00 2001 > > From: =?UTF-8?q?Tomas=20H=C3=A4rdin?= <tjop...@acc.umu.se> > > Date: Wed, 16 Jan 2019 13:07:48 +0100 > > Subject: [PATCH] palettegen: Fill with last color, not black > > > > If we fill with black then the generated palette will have one color more > > than what the user requested. This also resulted in unwanted black specks in > > the output of paletteuse, especially when generating small palettes. > > --- > > libavfilter/vf_palettegen.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/libavfilter/vf_palettegen.c b/libavfilter/vf_palettegen.c > > index 5ff73e6b2b..44323782d2 100644 > > --- a/libavfilter/vf_palettegen.c > > +++ b/libavfilter/vf_palettegen.c > > @@ -245,7 +245,7 @@ static void write_palette(AVFilterContext *ctx, AVFrame > > *out) > > av_log(ctx, AV_LOG_WARNING, "Dupped color: > > %08"PRIX32"\n", pal[x]); > > last_color = pal[x]; > > } else { > > - pal[x] = 0xff000000; // pad with black > > + pal[x] = last_color; // pad with last color > > } > > } > > pal += pal_linesize; > > Code LGTM, thanks >
> No FATE change? --- ./tests/ref/fate/filter-palettegen-2 2019-01-15 01:24:17.530911114 +0100 +++ tests/data/fate/filter-palettegen-2 2019-01-17 11:13:21.077198948 +0100 @@ -3,4 +3,4 @@ #codec_id 0: rawvideo #dimensions 0: 16x16 #sar 0: 1/1 -0, 0, 0, 1, 1024, 0x906ff5aa +0, 0, 0, 1, 1024, 0x23e072c8 Test filter-palettegen-2 failed. Look at tests/data/fate/filter-palettegen-2.err for details. make: *** [fate-filter-palettegen-2] Error 1 [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB In fact, the RIAA has been known to suggest that students drop out of college or go to community college in order to be able to afford settlements. -- The RIAA
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