I think the TODOs have been addressed.

diff --git a/TODO b/TODO
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-subtitles-and-nothing-else case; BlackDecoder? or make fill_black call video() rather than emit Video directly?
-- no because fill_video will never be called, the black has to come out in sync with everything else more or less
-- made tricky by fill_video post inaccurate seek
-- Black/SilenceDecoder?
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