[mythtv-users] Semi-OT: HD Questions

[Ivan Kowalenko]

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Hi. I'm kind of an HD n00b, but from what I've read about HDTV, I'm  
kind of confused.

I'm wondering how HDTVs are coping with the differences between  
MPEG-2 and H.264. That is, I mean, with the BBC doing its HD trials  
with H.264, how is it that existing HDTVs will know what to do with  
it? Has H.264 compatibility been around for a while? Shouldn't H.264  
in HD (even interlaced) require a marked increase in processing power  
to decode and scale (assuming your TV runs at a resolution lower than  
the signal)?

Second, I'm wondering if anyone would care to try to explain why this  
item requires on a 500 MHz PPC G4? Since doing 1080i on a PC seems to  
require greater than an AMD 1800, something doesn't seem to quite add  
up here. I'm guessing that 500 MHz is the minimal requirement for  
capturing, not playback.

Third, what is the minimum requirement for an HD back-end? I'm  
guessing not much, since the stuff is already encoded, but then  
again. There really hasn't been a lot of documentation that I can  
find about this (then again, I could just be looking in all the wrong  
places).

Thanks for all your help.
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