---
libavfilter/vf_palettegen.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavfilter/vf_palettegen.c b/libavfilter/vf_palettegen.c
index 27f74fd147..c03f62b942 100644
--- a/libavfilter/vf_palettegen.c
+++ b/libavfilter/vf_palettegen.c
@@ -82,7 +82,7 @@ typedef struct PaletteGenContext {
#define OFFSET(x) offsetof(PaletteGenContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption palettegen_options[] = {
- { "max_colors", "set the maximum number of colors to use in the palette",
OFFSET(max_colors), AV_OPT_TYPE_INT, {.i64=256}, 4, 256, FLAGS },
+ { "max_colors", "set the maximum number of colors to use in the palette",
OFFSET(max_colors), AV_OPT_TYPE_INT, {.i64=256}, 2, 256, FLAGS },
{ "reserve_transparent", "reserve a palette entry for transparency",
OFFSET(reserve_transparent), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "transparency_color", "set a background color for transparency",
OFFSET(transparency_color), AV_OPT_TYPE_COLOR, {.str="lime"}, 0, 0, FLAGS },
{ "stats_mode", "set statistics mode", OFFSET(stats_mode),
AV_OPT_TYPE_INT, {.i64=STATS_MODE_ALL_FRAMES}, 0, NB_STATS_MODE-1, FLAGS,
"mode" },
@@ -586,6 +586,11 @@ static int init(AVFilterContext *ctx)
if (s->use_alpha && s->reserve_transparent)
s->reserve_transparent = 0;
+ if (s->max_colors - s->reserve_transparent < 2) {
+ av_log(ctx, AV_LOG_ERROR, "max_colors=2 is only allowed without
reserving a transparent color slot\n");
+ return AVERROR(EINVAL);
+ }
+
return 0;
}
--
2.39.0
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