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palettegen: Fill with last color, not black

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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.
This commit is contained in:
Tomas Härdin 2019-01-16 13:07:48 +01:00
parent f2e89fe4d3
commit abc5ac3cf5
2 changed files with 2 additions and 2 deletions
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2
libavfilter/vf_palettegen.c
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@ -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;

2
tests/ref/fate/filter-palettegen-2
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@ -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