Most digital cable channels are broadcast over some form of IP (Internet Protocol, not Intellectual Property :) ), and are broadcast as straight MPEG-2 (or increasing in popularlty, MPEG-4) data. Thus, the data is free of artifacts introduced by going over the analog wire (i.e. it's perfect), and as such can easily be re-compressed. Even if you don't notice any noise in the picture of analog cable, rest assured, is is there, and it will affect the compression.
-- Joe --- Michael Eldridge <[EMAIL PROTECTED]> wrote: > I too have Comcast cable and subscribe to their > digital package with a > DCT-6200 digital cable box. Although I don't have > any fuzzy channels I > too have noticed file size differences in recorded > programs. What I'm > seeing in my recordings is the file size of channels > that require a > digital cable box to view come in at about one third > the total size of > recordings from channels available via basic cable. > > For example, a one hour recording of The Shield came > in at about 3 > gigs. Where as a one hour recording on the Trio > channel came in at 1 > gig. I've been attributing these results to > compression of the higher > numbered channels which I assume are being broadcast > via a digital > signal vs. the lower channels that I assume are > still being broadcast > via a less bandwidth efficient analog signal. Hence > the larger file > size. Not exactly the problem you're having but > interesting none the > less. > > If anyone has more knowledge about such things I'd > really like to hear > their thoughts. > > On Apr 14, 2005, at 8:19 PM, > [EMAIL PROTECTED] wrote: > > > Certain channels come in pretty fuzzy, with bad > quality, showing > > diagonal lines on the screen. Most channels come > in just fine and > > look great. These channels come in all fuzzy on a > normal TV as well. > > > > Here's the big problem though - on those channels > with the poor > > quality, the recording sizes are abnormally HUGE! > > We're talking about 3-4 times larger than the > recordings should be. > > For instance, a normal hour-long show will take up > 0.74 gigs, but the > > ones on the flaky channels will take up anywhere > from 2.5 to 3.5 gigs! > > It's really crazy! > > > _______________________________________________ > mythtv-users mailing list > [email protected] > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users > __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/
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