Tech Support > Microsoft Windows > Windows Media Center Edition > Live TV Jumpy with HDTV Tuner Capture Card
Live TV Jumpy with HDTV Tuner Capture Card
Posted by eebryant on March 14th, 2006


I recently purchased a MCE PC to get over the air HD channels to my XBOX 360.
My PC is an HP m7360n (Dual Core 2.8 GHz, 2gb DDR SDRAM). I installed the
KWorld ATSC-110 HDTV Tuner Card to enable HD reception. I also installed all
needed windows updates including the MCE rollup. I get a nice high
definition picture, but the Live TV video is very, very jumpy. However, when
I am recording Live TV or watching previously recorded programs the video is
great. Any ideas about what may be causing this problem?

Posted by JW on March 14th, 2006


Please clarify what happens with the different modes of watching HD Tv using
your just your MCE system moniotr or just using your XBOX.
How are your system and XBOX connected to your router wired or wireless.

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Posted by eebryant on March 15th, 2006


It happens on the PC Monitor and on the XBOX 360. The connection is wired.

"JW" wrote:

Posted by JW on March 15th, 2006


What is the CPU utilization while watching live HD TV? Is the HD card
sharing its IRQ with any other device? Try changing the slot that the HD
card is in
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Posted by Thierry Plouchart on March 17th, 2006


I have the same problem. I think it may be due to my graphics card ATI
(X300se) that came with the PC. I'm using an Avermedia A180 HDTV card but
have no more room for any other card. Was thinking about replacing the X300
with one on the Windows Partner list but I also noticed on some live viewing
of HD that the sound also drops out and is sometimes out of synch. The
picture is not very smooth. How would I find out how the CPU utilizes the
playing of HD TV and whether or not the HD card is sharing an IRQ with
another device?


"JW" <nospam@no.spam> wrote in message
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Posted by JW on March 17th, 2006


I believe your problem is different and is that the X300 does not have the
GPU power or memory banwidth to process HDTV especially 1080i programs
without dropping frames on a regular basis.
If you get an new card I recommend a 128 MB Nvidia 6600GT or better or a ATI
X1300 PRO (not the standard X1300) or better which not only will resolve
your jumpiness but will also provide picture PQ since these cards also have
better de-interlacing motion compensation support.
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Posted by Thierry Plouchart on March 18th, 2006


Well thanks. I thought all along that it would help to install a 6600 GT
card to improve the choppiness but didn't like the fan noise it would bring.
I just went on the web and can see that the X1300Pro also has a big o' fan
on it too. Aren't there any other cards without these loud fans? Kind of
takes away the whole experience. Thierry


"JW" <nospam@no.spam> wrote in message
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Posted by Thierry Plouchart on March 18th, 2006


You mentioned the NVidia 6600GT with only 128MB. NVidia also sells a
GeForce6600 (not GT) with 512MBs for just a few dollars more. Would you
consider this a better choice? Here's the link I found on it. Thanks Thierry
http://www.geeks.com/details.asp?inv...-512PI&cat=VCD


Posted by JW on March 18th, 2006


No I don't consider it a better choice it since it has a lower memory
bandiwdth andthe extra memory is really only requied for gamers but will do
a worse job with TV video since it can not handle HDTV 1080i programs
without dropping frames and does a much poorer job of of motion
compensation when de-interlacing either 480i or 1080i video. Today I saw
128MB 6600 GT cards for less than $150 on one Web site.

"Thierry Plouchart" <tplouchart@msn.com> wrote in message
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Posted by Thierry Plouchart on March 18th, 2006


JW, thanks for your help and knowledge. I guess the extra fan noise is an
unavoidable sacrifice? Thierry

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Posted by Thierry Plouchart on March 18th, 2006


Oops! JW, I forgot to mention. I've noticed a lot of web sites that sell
the GeForce 6600 GT 128MB but they don't say that they are NVidia. Do you
know if the technical requirements for that particular card are the same
for every manufacturer? Thanks Thierry

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Posted by JW on March 18th, 2006


AFAIK the technical requirements for the card for all manufacuters selling
cards with that chip are the same whereas they are not required to be the
same for the plain 6600 chip.
I base this conclusion on the following link in which the last column which
is the critical numer is computed from the two columns preceeding it and on
the assumption that the Memory is DDR 2 memory. And I have observed that
different plain 6600 board have different memory speeds which accounts for
the different prices of them.

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Posted by Thierry Plouchart on March 18th, 2006


Alright, thanks again JW!

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Posted by Ted Miller on March 20th, 2006


I have an eVGA 6600GT. I put a Zalman VGA cooler on it (replacing the stock
fan) and it is very quiet. The fan/buzz from my plasma TV is easily noisier
than my entire MCE box (and the plasma TV is itself pretty quiet).

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Posted by Thierry Plouchart on March 20th, 2006


eVGA? Is that any different than a run of the mill 6600GT card? And how do
you change the fan on such a tiny little card without ruining it? I had
thought of building a cabinet for my PC fully insulating it from sound with
two air holes for ventilation and a door to load DVDs. There was actually a
description of this in a Hometheater Magazine a while back. I sure would
like to look at all of my options. Where did you get this stuff?

"Ted Miller" <ted@millerzone.net> wrote in message
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Posted by JW on March 20th, 2006


EVGA is just the name of one of the many manufacuters that make graphics
cards with standard NIVIDA chips on them.

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Posted by eebryant on March 21st, 2006


My CPU utilization is no higher than 26% while watching live HD TV. I have
no more slots available. I guess I could swap something around. Also, I'm
not sure what IRQ is. If you will let me know I will look into it. Thanks
for your help.

"JW" wrote:

Posted by JW on March 22nd, 2006


You can use winidows help or Google to find out what IRQs are and how to
check them on them from Control Panel.


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Posted by eebryant on March 22nd, 2006


I installed the nvidia 81.98 driver update and it seems to have solved the
problem!


"JW" wrote:

Posted by Thierry Plouchart on March 22nd, 2006


Is it possible that there are any cards (such as the NVidia 6600GT 128MB)
out there with a preinstalled quieter fan. Otherwise does Zalman use the
same fan for all 6600GT cards? In which case I could do the work myself.


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