Directshow beginner question: how to synchronize playtime?

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Hi

I have a computational-intensive DShow transform filter that usually
processes frame at a slower rate than the actual video file frame rate
(the filter is used to process some MPEG video files). Because of this,
I noticed that when I connect the transform filter to the MPEG source
filter and render it, the whole graph takes longer to complete than the
actual MPEG file duration. Is there a way to somehow make the graph
completion rate the same as the MPEG file duration, e.g. by telling the
graph to drop some frames when processing takes longer than the source
framerate or something to that effect?

Thanks!

.

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