[mythtv] Playback and yuv2rgb_init_mmx/yuv2rgb_init_mmxext ?

[Nigel Pearson]

> The fact that the code in question is used only for the little preview 
> window
> on the playback screen?

	Speaking of which, any good reason to keep this code?
We could be overlaying an videoout_* scaled window there
(like in the program guide).

	It isn't a big problem keeping it the way it is,
but it does use more CPU than the Xv (or IVTV or Quartz)
equivalent, and it also means that the little window
doesn't animate on Mac OS X.

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