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/vf_blend.c b/libavfilter/vf_blend.c
index 2731ec81bf..a3235e684b 100644
--- a/libavfilter/vf_blend.c
+++ b/libavfilter/vf_blend.c
@@ -352,7 +352,7 @@ static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
     uint8_t *dst    = td->dst->data[td->plane];
     double values[VAR_VARS_NB];
 
-    values[VAR_N]  = td->inlink->frame_count;
+    values[VAR_N]  = td->inlink->frame_count_out;
     values[VAR_T]  = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);
     values[VAR_W]  = td->w;
     values[VAR_H]  = td->h;