Rob wrote:
Plain old SDTV analog cable is 480i (I think).
I get HDTV over-the-air, and even when it is mythtranscode'd down to
720x480 (480p, I guess), the picture is still much better. I think
what I am seeing is the difference between a clear digital signal and
a noisy analog signal, and probably not so much to do with the
increased resolution.
This is what I find with my dual analog / SDTV setup. Analog captured at
720x576 is noticeably fuzzier than my SDTV signals. The signal strength
is solid - there's no noise on analog - it's just softer. I'm supposing
it's because of the "analog -> crappy bttv capture" step. Luminance
bandwidth on the video signal input to your capture chip is the key
issue here, which is dependant on what tuner you've got on your card.
Digital transmission doesn't suffer from this kind of problem so it ends
up sharper. It *does* suffer from a heap of other things though,
especially if broadcasters try and squeeeeeeze another channel in :-)
Dave
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