Hardware options

Hi all. I am looking for options to speed up H.264 encoding of 1080i material. I'm wondering if anyone can suggest any hardware add-ons for a MacBook Pro. The Turbo.264 HD always outputs progressive video, but I am encoding 1080i video so it is of no use to me. Are there other USB, firewire, or Express card accelerators? I would like to avoid occupying my primary machine for 36 hours at a time.
Or, will setting up a cluster with a CoreDuo MacBook dramatically speed up encoding, or is it a drop in the bucket?
Also, I have a G4 tower which is unused. I don't think it will run compressor, so I don't think I can use it. Any other ideas? It has PCI slots, but I would imagine the processor to be a limiting factor.
Thanks much.
Jeremy

I appreciate you asking, because this seems to be overlooked in various forums. This is home video, which is 1080i60 HDV. I know that many people pursue a "film look" by deinterlacing to 30p or 24p, but it just looks less like video and more like a cheap movie. At least, it does when watching our home movies. The motions is less lifelike, since in the original something moves 60 times a second, but not after deinterlacing.
A good example is how we have been watching our videos in the first place. We have a projector, so flaws in the video get blown up. I tried plugging my Mac in, and the video was deinterlaced by the nature of the video connection. It looked unnatural, and not like the original. VLC could play the original HDV and do a bob deinterlace (making 1080p60) but my machine could barely keep up and dropped a number of frames. We settled on a PS3 as a blu-ray player and media interface. As long as the HDV files are wrapped as mpeg transport streams, the PS3 plays them at the proper frame rate (or I should say "field rate").
Now we have too much footage to fit on the PS3 hard drive, and I would like to be able to put it onto a disc. I've decided H.264 is the way to go, but I do not want 1080p30 because it looses the realism (for home video) and 1080p60 would double the filesize. I would rather let the PS3 or projector do the deinterlacing on the fly.
Thanks for your question.
Jeremy

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