Files
ffmpeg/libavfilter
Jack Lau 0a73316166 avfilter/vf_feedback: fix feedback block
Fix #20940

The feedback and its sub-filter both request frame
from each other, casuing block since 4440e499ba

The feedback should only request inputs[1] once
rather than continuously request frame cause blocking.

This patch add check whether feedback already request
inputs[1] via ff_outlink_frame_wanted(ctx->outputs[1]),
if true, then exit and waiting inputs[0] because it means
we need more frames input to proceed.

Signed-off-by: Jack Lau <jacklau1222gm@gmail.com>
(cherry picked from commit 3f0842294f)
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