Managed directShow -mixing video & audio?

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Hi,

I'm a complete dshow novice - I'm trying to find out if the following is
possible/feasible from c# but eveything I look at overwhelms me with confusing
nomenclature...

What I want to do is take an audio file, and then loop a short repeating bit
of (silent) video over it and play the result in a window as part of my
application.

I'd be greatful if anyone could suggest what ballpark this falls into from:

1) Easy!
2) Possible but fiddly
3) Forget it!

Of course if anyone has any sample code that would be extra lovely!
Cheers

Ant
.