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IMFVideoRenderer::InitializeRenderer and E_INVALIDARG response

Hey all,

After 5-10 playback graphs have been created and destroyed throughout the course of my application's lifetime, for some reason the EVR presenter returns
E_INVALIDARG on InitializeRenderer. Other presenters such as VMR7 or VMR9 have no such problem.

I'm just wondering what the root cause would be for IMFVideoRenderer::InitializeRenderer returning E_INVALIDARG to me. MSDN says "
Either the mixer or the presenter is invalid." which is less than helpful.

Any pointers appreciated,

- Simon

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