DirectShow Capture with delayed play

I'm developing a custom video capture application. The idea is to capture output from a webcam, and simultaneously display a delayed preview.

For instance if a user specifies a delay of 5 minutes, after 5 minutes of video capture the video preview will star playing what was captured 5 minutes ago, and will keep playing until five minutes after capture as stopped.

Building some sort of buffer filter will not work 开发者_开发百科because the user should be able to specify minutes of delay. 5 minutes of buffered video in memory doesn't look like a smart idea.

So I think the best way is to read the same file that is being wirtten by the capture aplication.

Any ideas?

Cheers

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Buffering is the only option I can think of for this...but who's to say you can only buffer it in RAM ;).

This is all hypothetical, but you could try using the built in Stream Buffer Engine. It only deals with mpeg2 types, so you may have to send to a mpeg2 encoder before the SBE filters.