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On Sat, 2007-05-19 at 21:06 -0400, William Munson wrote:
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<FONT COLOR="#000000">Dale wrote:</FONT>
<FONT COLOR="#000000">> Hi,</FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> I have an AirStar-HD5000AV-PCI card running on my backend MythTv system. It</FONT>
<FONT COLOR="#000000">> records standard definition (SDTV) digital flawlessly. No pixelation at</FONT>
<FONT COLOR="#000000">> all. However, when I record HDTV content I get many "bursts" of pixelated</FONT>
<FONT COLOR="#000000">> areas on the playback. They occur roughly every 4 to 10 seconds and show as</FONT>
<FONT COLOR="#000000">> horizontal defects that are several scanlines tall. </FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> I'm pulling the QAM 256 modulated digital video from my TimeWarner system.</FONT>
<FONT COLOR="#000000">> The card taps in right at the incoming cable. The digital STB from</FONT>
<FONT COLOR="#000000">> TimeWarner works flawlessly and it's much farther down the cable than my</FONT>
<FONT COLOR="#000000">> MythTv backend.</FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> My first thought is that perhaps the caching between the capture card and</FONT>
<FONT COLOR="#000000">> hard drive is not working well. I'm just not sure how to set or diagnose</FONT>
<FONT COLOR="#000000">> this. I've been a software developer (Assembly, C/C++ ...) for many years</FONT>
<FONT COLOR="#000000">> but Linux is fairly new to me.</FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> My analog capture cards work capture excellent quality video. Much better</FONT>
<FONT COLOR="#000000">> than my Tivo Series 1 in it's best quality mode.</FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> My system is comprised of:</FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> Athlon XP 3000+</FONT>
<FONT COLOR="#000000">> 2 GB of RAM</FONT>
<FONT COLOR="#000000">> Two PVR 150 analog capture cards (they usually not capturing while HDTV is)</FONT>
<FONT COLOR="#000000">> One AirStar-HD5000AV-PCI card</FONT>
<FONT COLOR="#000000">> 500 GB Maxstor 7H500 SATA drive.</FONT>
<FONT COLOR="#000000">> NVIDIA GPU GeForce FX 5200</FONT>
<FONT COLOR="#000000">></FONT>
<FONT COLOR="#000000">> Dale</FONT>
<FONT COLOR="#000000">> </FONT>
<FONT COLOR="#000000">I don't have an answer to your question but wanted to chime in that I am </FONT>
<FONT COLOR="#000000">also getting many glitches from my ComCrap cable (20+ in any 1 hour show </FONT>
<FONT COLOR="#000000">with no discernible pattern or timing) and I was wondering if there was </FONT>
<FONT COLOR="#000000">a tool to measure the number/type of disruptions. I have a HDHR </FONT>
<FONT COLOR="#000000">connected via a dedicated high speed switch. I have a AthlonXP 3200+ </FONT>
<FONT COLOR="#000000">overclocked to 2.6GHz, 512M ram, 2 pvr250's and a FX5200 video card.</FONT>
<FONT COLOR="#000000">It would really be helpful to me if I could prove that the glitches are </FONT>
<FONT COLOR="#000000">in the source stream and not in my setup.</FONT>
<FONT COLOR="#000000">Bill</FONT>
<FONT COLOR="#000000">_______________________________________________</FONT>
<FONT COLOR="#000000">mythtv-users mailing list</FONT>
<FONT COLOR="#000000"><A HREF="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</A></FONT>
<FONT COLOR="#000000"><A HREF="http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users">http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</A></FONT>
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<BR>
Do not know if this helps, but I have noticed glitches in digital only channels after I added an amplified splitter. My first digital box from TW was working fine until I needed another TV connection. Not wanting to degrade the signal I bought the amp with extra outputs. Did not put all this together until I switched to Fios. Same story, they disconnected my amplified splitter and install a passive with only 4 connections. A week later I re-installed the amp to get the Mythbox on line again. Same problems are present in fast paced digital movies. My next step is to install another passive splitter to see if the problem disappears. There were some posts regarding tuner card sensitivity to high inputs, maybe a cheap attenuator is the answer. My other SD TVs do not have problems.<BR>
Joel
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