This filter is supposed to produce CFR output.
---
 libavfilter/vf_tinterlace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavfilter/vf_tinterlace.c b/libavfilter/vf_tinterlace.c
index 399adc102d..7c54861de4 100644
--- a/libavfilter/vf_tinterlace.c
+++ b/libavfilter/vf_tinterlace.c
@@ -510,6 +510,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame 
*picref)
     }
 
     out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, 
outlink->time_base);
+    out->duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), 
outlink->time_base);
     ret = ff_filter_frame(outlink, out);
 
     return ret;
-- 
2.35.1

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