EFF Reviews HDTV PVR Solution for Mac
enrico_suave points out this "PVRBlog post about EFF's Review of Elgato's EyeTV 500, an HDTV solution for the Mac. Well, a very speedy dual-processor G5 Mac, apparently. The Electronic Frontier Foundation has been doing a lot of important work defending our online and digital rights including opposing the dreaded FCC mandated broadcast flag (cue boos and hisses) Elgato and Plextor also have a Standard Definition homebrew PVR solution with an EyeTV and ConvertX PVR bundle (Wired review)." (See also this earlier review from a Slashdot reader.)
Have the P4 or AMD do it in software and it'll take you to a dual or very powerful single processor.
THe only reason (which you would have found out if you read the article) it requires a Dual G5 for SMOOTH playback is because Apple decided to be stupid and keeps the MPEG2 hardware playback API private so that they have to do the decoding in software and not hardware like a normal Intel based system can.
Its not a hardware issue at all, but a simple OS design issue. One of the very few places where OS X actually fails compared to Linux or Windows.