What is Uverse400?
Sam
mark.dodge wrote:
I do not know where to get any figures to give a size or fps figures but all
I know is that after switching from Direct TV to UVerse400 I have seen a
significant improvement in the quality of the picture and very little
pixelization in all HD channels. I had very frequent, daily problems with
dropped signal, loss of audio, freezing and very bad pixelization on all of
the broadcast stations along with Discovery Showtime and HBO and skipping
sound on ESPN2 just to name a few. I do not get it but once or twice a week
on UVerse. I am very happy with the switch and I had been with D-TV for
close to 6 years.
-----Original Message-----
From: hardware-boun...@hardwaregroup.com
[mailto:hardware-boun...@hardwaregroup.com] On Behalf Of Brian Weeden
Sent: Wednesday, April 08, 2009 07:39
To: hardware@hardwaregroup.com
Subject: Re: [H] HDTV Math
If you looked at satellite HD broadcasts I would suspect you would find even
worse bitrates among several of the HD stations.
It all comes down to bandwidth - the cable satellite operators have limited
bandwidth and are trying to cram as many stations in as possible, and in
many case this means highly compressing some stations. Usually they try to
make sure that HD signals where it is most likely to be noticed (Discovery
HD, PPV movies and live sports) get the best signal while other pseudo HD
channels like History or HGTV will get re-compressed like crazy.
---------------------------
Brian Weeden
Technical Consultant
Secure World Foundation <http://www.secureworldfoundation.org>
+1 (514) 466-2756 Canada
+1 (202) 683-8534 US
On Wed, Apr 8, 2009 at 1:35 AM, James Maki <jwm_maill...@comcast.net> wrote:
I discovered something this week and am trying to understand its
ramifications. I noticed lots of pixelation and motion blur the last two
weeks of Heroes. NBC broadcasts at 1080i for HDTV. I checked the
statistics
for the show I recorded via HD Homerun tuners using Comcast cable, and NBC
is averaging about 4.8 GB per hour for a 1080i show. I thought is a bit
low
but was even more surprised when I checked out shows on the other
broadcast
networks.
ABC 720p/60fps 6.3 GB
NBC 1080i/29.97fps 4.8 GB
CBS 1080i/29.97fps 5.6 GB
PBS 720p/60fps 5.4 GB
CW 1080i/29.97fps 7.9 GB
FOX 720p/60fps 7.3 GB
I find it strange that NBC has the lowest total file size but is
broadcasting at 1080i, so I assuming (and I know the drawback of that!) it
is compressed more than the other channels and am again assuming that is
why
I am seeing the picture degradation. Calling Comcast is a joke, so I
wanted
to do the math to calculate the 'bits-per-second" for each case, but am
not
exactly sure if I am doing this correctly. It would seem that 4.8 GB/hr
would calculate as:
4.8 GB/hr * 1 hr/60 min * 1 min/60 sec * 1024 MB/GB * 8 Mb/MB = 10.9 Mbps.
One online source indicated that for quality 1080i you should have at
least
15 Mbps.
For the FOX network, the calculation would give 16.6 Mbps, far better than
the 12 Mbps my online source gave for quality 720p broadcasts.
I can't understand why the 720p broadcast is actually providing better
throughput than the 1080i. It seems backwards (which is why I am wondering
if my math is correct). I am not sure how to factor in the fps figures, if
at all.
If you can add some insight, it would be appreciated.
Thanks,
Jim Maki
jwm_maill...@comcast.net
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