PC HDTV cards are increasingly cheap and effective, but I can't speak
with any certainty about Linux support for a given model. Supposedly
the DVICO FusionHDTV cards work, and are a bit cheaper than the PCHDTV
(about $100 for the base model, versus 130), but I blew mine up before
trying it under Linux. The card was a bit flaky overall anyway
(crashing possibly because of poor Windows drivers) I switched to a
Leadtek HDTV Cinema which people can't even seem to get working under
Windows.
Supposedly recording HDTV is easier than SDTV because it's already in a
digital-packaged format and just needs to be plumbed to the right place.
As for the cards themselves, though, a lot of them are fairly
processor-intensive, due to much of the decoding being handed off to
the CPU.
I note that decoding a 480i broadcast seems to draw about 15% of my CPU
(an Athlon X2 4600+), and a 720p or 1080i one, about 35%.
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