In libavfilter/vf_palettegen.c, the function get_avg_color requires
that box->len greater than zero to avoid dividing by zero. However,
the call sequence filter_frame -> get_palette_frame -> get_avg_color
may not satisfy this precondition. The bug is detailed in the bug
tracker:https://trac.ffmpeg.org/ticket/9222.
Signed-off-by: Yiyuan GUO <ygu...@gmail.com>
---
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 ef8bc18..73ec3c7 100644
--- a/libavfilter/vf_palettegen.c
+++ b/libavfilter/vf_palettegen.c
@@ -489,7 +489,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
if (s->stats_mode == STATS_MODE_DIFF_FRAMES) {
av_frame_free(&s->prev_frame);
s->prev_frame = in;
- } else if (s->stats_mode == STATS_MODE_SINGLE_FRAMES) {
+ } else if (s->stats_mode == STATS_MODE_SINGLE_FRAMES && s->nb_refs) {
AVFrame *out;
int i;
--
2.25.1
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