[FFmpeg-devel] [PATCH] avfilter: update filter timeline state only on main link

[Gyan Doshi <ffmpeg@gyani.pro>]

At present, consume_update evaluates timeline state on all links for
a multi-input filter. This can lead to the filter being incorrectly
en/dis-abled when evaluation on a frame on a secondary link leads to
a different result than the frame on the current main link next in
line for processing.
---
 libavfilter/avfilter.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index daa7c3672a..d7ea993508 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -1430,7 +1430,8 @@ static void consume_update(FilterLinkInternal *li, const AVFrame *frame)
     AVFilterLink *const link = &li->l;
     update_link_current_pts(li, frame->pts);
     ff_inlink_process_commands(link, frame);
-    link->dst->is_disabled = !ff_inlink_evaluate_timeline_at_frame(link, frame);
+    if (link == link->dst->inputs[0])
+        link->dst->is_disabled = !ff_inlink_evaluate_timeline_at_frame(link, frame);
     link->frame_count_out++;
     link->sample_count_out += frame->nb_samples;
 }
-- 
2.44.0

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