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Posted by Jeff Rife on 12/20/05 04:30
David Levy (d_levy@lifeisunfair.net) wrote in alt.video.dvd:
> > For output, yes, since the HD stream can't be recorded by anything
> > else (well, a PC that is pretending to be a D-VHS unit can record
> > it, but that's really the same thing).
>
> That's precisely what I had in mind. Yes, it is basically the same
> idea, with the main difference being that personal computers are far
> more popular than DVHS VCRs.
....and far less useful for this particular job.
First, you have to install a driver that is completely non-standard and
has no support. Then, you have to live with the fact that only a true
D-VHS can support the copy protection on the FireWire, so you can only
record unencrypted channels.
It's far easier to buy a $200 PCI HDTV card that can record the exact same
channels but comes with a UI that allows scheduled recordings and has
support from the manufacturer.
> > There isn't anything in their specs that say *how* they display 480p.
>
> 480p is listed not merely as a compatible input format, but as a
> "display format."
It's possible it displays 480p as 540p (since it claims to have 1080i
display and the timings are the same) as a cost-saving measure.
Without some sort of "raster squeeze", 16:9 480p requires 640 progressive
scan line timing on the display. That's an odd timing (relatively).
Doing a squeeze results in a loss of quality, so although it might
technically be 480p, it ain't at that quality. Likewise for 1080i.
These are the sort of weird things that get done to make a 4:3 "HDTV"
cost less than $500, and (again!) there is absolutely no way of knowing
without cracking the case and testing.
--
Jeff Rife |
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