Calvin Walton (2018-02-19):
> The old version of the filter had a problem where it would queue up
> all of the duplicate frames required to fill a timestamp gap in a
> single call to filter_frame. In problematic files - I've hit this in
> webcam streams with large gaps due to network issues - this
I've found one minor problem with this patch. The actual functionality
is correct, as best I can tell, but the stats collection
(dropped/duplicated frames) will under-report dropped frames in my
testing. I'm going to rework the stats collection code a bit, but I
expect this to be a relatively minor