[MPlayer-dev-eng] Samples for frame inserting filters?

[Uoti Urpala]

I finally implemented the frame-insertion functionality I talked about
earlier (added it to my earlier patch that allows filters to modify pts
values, still haven't properly cleaned it up). However I don't have any
good samples and haven't used those filters before so I'd like to get
some recommendations for samples and corresponding filter chains to use
for basic testing.