[FFmpeg-devel] yadif frame doubling - incorrect closed captioning

[Gabriel Blanchard]

When frame doubling using yadif/bwdif closed captioning gets copied to the
second frame - as a result the closed captioning text is garbage.

I've attached a very simple patch that fixes this issue. Very similar to
what vf_fps.c already does around line 253.

-Gabe
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