CSourceStream filter

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I have been trying very hard to complete a CSourceStream filter but have a
problem. I can get it to play just fine. If I pause the graph while using it
then
SetPosition to the start to play again it looks like the output is stuck in
a cache.
If I hit call Setposition about 6 times it finally seems to set the position
back to 0.
I cant seem to clear the internal graph cache.
I used an example from a book an added calls to
DeliverBeginFlush()
CSourceStream::Stop()
DeliverEndFlush();
then
CSourceStream::Pause()

This does nothing. So I am out of ideas. It seems like
I am fighting and internal cache and I dont know how to flush it.
FYI
I have checked my FillBuffer and it is loading the right frame of data.

--
Thanks,
Bob
.

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