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DirectShow Playback not smooth

DirectShow Playback not smooth

DirectShow Playback not smooth

I'm using DirectShow to play back movie files (eventually will have live input as well).  I then perform some pretty cpu intensive MMX ops on each frame before display.  I was finding that even though it was running at 20 fps the actual video image was updating unevenly at around 4 or 5 fps.

Eventually I discovered that putting my process to Sleep for about 0.02 seconds smoothed out the playback by giving the DirectShow process more time to do its thing.  

This isn't really a good solution, its approximate and wasteful and the optimum amount of time to Sleep will vary from machine to machine.  

Just wondering if anyone has alternative solutions?  BTW I haven't altered any process priorities.

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