As per the doc, prev_selected_n should be NAN at the start.
However, this was never set.
---
libavfilter/f_select.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/libavfilter/f_select.c b/libavfilter/f_select.c
index 47e36f0014..109dae403a 100644
--- a/libavfilter/f_select.c
+++ b/libavfilter/f_select.c
@@ -230,6 +230,7 @@ static int config_input(AVFilterLink *inlink)
select->var_values[VAR_N] = 0.0;
select->var_values[VAR_SELECTED_N] = 0.0;
+ select->var_values[VAR_PREV_SELECTED_N] = NAN;
select->var_values[VAR_TB] = av_q2d(inlink->time_base);
--
2.39.1
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