[FFmpeg-cvslog] palettegen: Fill with last color, not black

[Tomas Härdin]

ffmpeg | branch: master | Tomas Härdin <tjoppen at acc.umu.se> | Wed Jan 16 13:07:48 2019 +0100| [abc5ac3cf5176189f43062f6a3e29fd012134613] | committer: Tomas Härdin

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.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=abc5ac3cf5176189f43062f6a3e29fd012134613
---

 libavfilter/vf_palettegen.c        | 2 +-
 tests/ref/fate/filter-palettegen-2 | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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;
diff --git a/tests/ref/fate/filter-palettegen-2 b/tests/ref/fate/filter-palettegen-2
index aa07b6cb93..9abec0fe8e 100644
--- a/tests/ref/fate/filter-palettegen-2
+++ b/tests/ref/fate/filter-palettegen-2
@@ -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