DeckLink source

[Josh Doe]

I'm working on making decklinksrc work on Windows, and can stream to disk
fine (at normal framerates, using composite NTSC source), but if i display
to the screen (e.g. using dshowvideosink) the framerate drops to something
like 1fps.

What might be the cause of this?

FYI, DeckLink provides a COM interface, and I've copied the relevant bits
from dshowvideosink for handling this.

Thanks,
-Josh
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