[mythtv-users] Question about BT8x8 digital TV cards

[Phill Edwards]

I'm in Australia and thinking of going digital. I have 2 BT8x8
analogue cards now which works well. I was going to replace one of
these with a digital  BT8x8 card (something like a VisionPlus which
people have reported as easy to get working and good quality). Before
I do this I have some questions:

1) Is it OK to have 1 analogue card + 1 digital card in the same backend? 

2) Do digital BT8x8 cards chew up CPU? I know the analogue ones do,
but I thought that the digital cards just wrote the incoming MPEG2
stream straight to disk which would mean very little CPU required. Am
I right or delusional?

3) Will playback of MPEG2 require more CPU than playback of my
existing MPEG4 recordings?

4) Will there be issues writing digital MPEG2 + analogue MPEG4
recordings to disk simultaneously? I saw a thread about overloading
the PCI bus or something.

Anything else I should worry about?

Thanks,
Phill