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new e196e57ca2 avfilter/vf_fillborders: reject borders of half the frame
in reflect mode
e196e57ca2 is described below
commit e196e57ca225a98654e482806fa714facd232b57
Author: Martin Mirchev <[email protected]>
AuthorDate: Sun Oct 18 19:38:12 2026 +0800
Commit: michaelni <[email protected]>
CommitDate: Fri Nov 6 22:56:38 2026 +0000
avfilter/vf_fillborders: reject borders of half the frame in reflect mode
Reflect mode mirrors around the edge pixel without repeating it, so a
border of n lines reads lines up to 2 * n away from the edge. The
borders were only checked against half the frame size, which is enough
for mirror mode but not here: with bottom or right equal to half the
height or width the filter read before the start of the plane, and with
top or left equal to half it reflected lines outside the image.
Signed-off-by: Martin Mirchev <[email protected]>
---
libavfilter/vf_fillborders.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/libavfilter/vf_fillborders.c b/libavfilter/vf_fillborders.c
index 0ee4f14ab9..3ba009dae4 100644
--- a/libavfilter/vf_fillborders.c
+++ b/libavfilter/vf_fillborders.c
@@ -617,6 +617,14 @@ static int config_input(AVFilterLink *inlink)
return AVERROR(EINVAL);
}
+ /* reflect does not repeat the edge pixel, so it reads 2 * border + 1
lines */
+ if (s->mode == FM_REFLECT &&
+ (inlink->w <= s->left * 2 || inlink->w <= s->right * 2 ||
+ inlink->h <= s->top * 2 || inlink->h <= s->bottom * 2)) {
+ av_log(ctx, AV_LOG_ERROR, "Borders must be smaller than half the input
frame size in reflect mode.\n");
+ return AVERROR(EINVAL);
+ }
+
s->borders[0].left = s->borders[3].left = s->left;
s->borders[0].right = s->borders[3].right = s->right;
s->borders[0].top = s->borders[3].top = s->top;
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