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diff --git a/libavfilter/vf_pad.c b/libavfilter/vf_pad.c
index 634af4c..cddd2a6 100644
--- a/libavfilter/vf_pad.c
+++ b/libavfilter/vf_pad.c
@@ -167,12 +167,17 @@ static int config_input(AVFilterLink *inlink)
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto eval_fail;
s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
+ if (!s->h)
+ var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h = inlink->h;
+
/* evaluate the width again, as it may depend on the evaluated output height */
if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto eval_fail;
s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
+ if (!s->w)
+ var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w;
/* evaluate x and y */
av_expr_parse_and_eval(&res, (expr = s->x_expr),
@@ -197,11 +202,6 @@ static int config_input(AVFilterLink *inlink)
return AVERROR(EINVAL);
}
- if (!s->w)
- s->w = inlink->w;
- if (!s->h)
- s->h = inlink->h;
-
s->w &= ~((1 << s->hsub) - 1);
s->h &= ~((1 << s->vsub) - 1);
s->x &= ~((1 << s->hsub) - 1);
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