[mythtv-users] High-Definition Playback performance data

[Ian Trider]

> What about nvidia 5200 that's not AGP, but rather PCI? I'm getting good
> SD but no dice on HD using a 5200 and an Air2PC both PCI... am I
> somehow swamping the PCI bus?

Probably.  The DScaler people (excellent program, BTW) say this about
PCI and video:

--
Can I use any vga card as a display device ?

This is what Mark Rejhon has to say about this:

"DScaler requires an AGP card. It is impossible to do on a PCI video
card. DScaler uses massive amounts of *bidirectional* bus bandwidth:
250 megabits per second incoming bandwidth (from TV card) and about
500 megabits per second outgoing bandwidth (to videocard). This bus
data firehose is not feasible on PCI bus, as PCI can reliably
continuously transfer up to about 600-700 megabits per second *in one
direction only* out of a possible 1056 megabits per second (132
megabytes per second) due to overhead. Try to go bidirectional, and
framerate literally gets the death penalty!"

http://deinterlace.sourceforge.net/FAQ.htm 
--

Add HDTV to the mix and I'm fairly sure it just isn't possible..

-- 
Ian Trider
iantri at gmail.com