[mythtv] Mac OS X video: QuickTime implementation

[Nigel Pearson]

> - On my PowerBook G4 800, I have frequent "prebuffering pause" and 
> "A/V diverged" problems.  Under v1, I couldn't draw enough frames to 
> trigger the prebuffering error, so I don't know if I did something 
> wrong.  Changing the kPrebufferFrames number alters, but does not 
> cure, the problem.

On my PowerBook G4 400, can do 20fps with audio, 22fps without.
Prebuffering pauses every 3-10 seconds.
Audio stuttered after the first few secs (once prebuffers used up?).

Maybe we need to add a "benchmarking" routine to NVP, that takes the
first frame received from the decoder, and accurately times a loop
of 100 calls to PrepareFrame();ProcessFrame();Show(), just so that
we can reliably measure any improvements that we make?

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