lavfi: split frame_count between input and output.

AVFilterLink.frame_count is supposed to count the number of frames
that were passed on the link, but with min_samples, that number is
not always the same for the source and destination filters.
With the addition of a FIFO on the link, the difference will become
more significant.

Split the variable in two: frame_count_in counts the number of
frames that entered the link, frame_count_out counts the number
of frames that were sent to the destination filter.

1 files changed, 1 insertions, 1 deletions

diff --git a/libavfilter/f_select.c b/libavfilter/f_select.c
index 52f474eb93..03c1c0f3f3 100644
--- a/libavfilter/f_select.c
+++ b/libavfilter/f_select.c
@@ -318,7 +318,7 @@ static void select_frame(AVFilterContext *ctx, AVFrame *frame)
     if (isnan(select->var_values[VAR_START_T]))
         select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
 
-    select->var_values[VAR_N  ] = inlink->frame_count;
+    select->var_values[VAR_N  ] = inlink->frame_count_out;
     select->var_values[VAR_PTS] = TS2D(frame->pts);
     select->var_values[VAR_T  ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
     select->var_values[VAR_POS] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);