How many tv capture cards (NTSC full rate, full frame) in a PCI bus

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Wondering if anyone has opinions on how many TV capture cards a PCI
bus will support running at 720x486 @ 29.97fps.  I guess the question
is, what is the bandwidth requirements of a 720x486 @ 29.97fps data
stream and how much _sustained_ bandwidth does the average PCI bus
have?

Maybe PVR-250 cards are really the only way to go if you want 3+
simultaneous streams at full frame/full rate.

Thots?

b.

-- 
Brian J. Murrell

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