[mythtv-users] Re: Channels with poor quality create HUGE
joevph at yahoo.com
Fri Apr 15 04:27:20 UTC 2005
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.
--- Michael Eldridge <meldridge at mac.com> 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
> If anyone has more knowledge about such things I'd
> really like to hear
> their thoughts.
> On Apr 14, 2005, at 8:19 PM,
> mythtv-users-request at mythtv.org 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!
> > _______________________________________________
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> mythtv-users at mythtv.org
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