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avfilter/vf_feedback: fix feedback block

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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>
This commit is contained in:
Jack Lau
2025-11-18 06:45:06 +08:00
committed by Marton Balint
parent bce14bb160
commit 3f0842294f
1 changed files with 4 additions and 0 deletions
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4
libavfilter/vf_feedback.c
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@@ -245,6 +245,10 @@ static int activate(AVFilterContext *ctx)
}
if (!s->feed || ctx->is_disabled) {
if (!ctx->is_disabled && ff_outlink_frame_wanted(ctx->outputs[1])) {
ff_inlink_request_frame(ctx->inputs[0]);
return 0;
}
if (ff_outlink_frame_wanted(ctx->outputs[0])) {
ff_inlink_request_frame(ctx->inputs[0]);
if (!ctx->is_disabled)