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, 4 insertions, 4 deletions

diff --git a/libavfilter/vf_fade.c b/libavfilter/vf_fade.c
index 0496645c97..c30c41db0d 100644
--- a/libavfilter/vf_fade.c
+++ b/libavfilter/vf_fade.c
@@ -300,7 +300,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
     if (s->fade_state == VF_FADE_WAITING) {
         s->factor=0;
         if (frame_timestamp >= s->start_time/(double)AV_TIME_BASE
-            && inlink->frame_count >= s->start_frame) {
+            && inlink->frame_count_out >= s->start_frame) {
             // Time to start fading
             s->fade_state = VF_FADE_FADING;
 
@@ -311,15 +311,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 
             // Save start frame in case we are starting based on time and fading based on frames
             if (s->start_time != 0 && s->start_frame == 0) {
-                s->start_frame = inlink->frame_count;
+                s->start_frame = inlink->frame_count_out;
             }
         }
     }
     if (s->fade_state == VF_FADE_FADING) {
         if (s->duration == 0) {
             // Fading based on frame count
-            s->factor = (inlink->frame_count - s->start_frame) * s->fade_per_frame;
-            if (inlink->frame_count > s->start_frame + s->nb_frames) {
+            s->factor = (inlink->frame_count_out - s->start_frame) * s->fade_per_frame;
+            if (inlink->frame_count_out > s->start_frame + s->nb_frames) {
                 s->fade_state = VF_FADE_DONE;
             }