<div><span class="gmail_quote">On 1/17/06, <b class="gmail_sendername">Brandon Beattie</b> <<a href="mailto:brandon+myth@linuxis.us">brandon+myth@linuxis.us</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On Tue, Jan 17, 2006 at 03:20:59PM -0500, Michael Haan wrote:<br>> > How often does it do this? Is it always the same channel? What is your
<br>> > receiving signal strength?<br>> ><br>> > --Brandon<br>> > _______________________________________________<br>> > mythtv-users mailing list<br>> > <a href="mailto:mythtv-users@mythtv.org">
mythtv-users@mythtv.org</a><br>> > <a href="http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users">http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br>> ><br>><br>> Started off, this was happening in myth when watching hd recordings. If a
<br>> recording froze, it would consistently freeze in the same place. So I<br>> manually record off of the 3000 using azap. Playing back with mplayer<br>> causes mplayer to dump at the same spot everytine. It seems to happen on
<br>> most channels, eventually.<br><br>By the design of HD tuners, you either get the data or not, there's no<br>middle ground. If you're getting corrupt data part way through it's<br>either because you can't write to disk fast enough (Or your system is
<br>under a huge amount of stress) and myth's file<br>writer thread discards the data, or, you're not receiving a good and<br>steady signal. If you're not getting good enough signal all the time then<br>you can't expect a tuner card to work well. Tree's moving is probably the
<br>most common cause of "it works good most of the time" situation.<br>Sometimes a plane or helicopter can block the signal long enough that<br>even the redundant data sent in an MPEG2-TS stream isn't enough and so
<br>you lose data. If an app is choking on bad data it's the apps fault, or<br>your fault for not giving it a steady enough signal. There's no such<br>instance as "The tuner is causing corrupted data" it just not possible.
<br>The hardware logic in the analog to digitial converter is the same or<br>near identical in every HD tuner made, depending on chipsets. It works,<br>or doesn't work. ... And if it's not working, fix the signal or what
<br>the processed data is being sent to.<br><br>--Brandon<br>_______________________________________________<br>mythtv-users mailing list<br><a href="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</a><br><a href="http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users">
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br></blockquote></div><br>I understand what you're saying. The first thing I would note is that this is QAM not satellite so trees etc aren't the issue. The machine is an AMD64 3800+ writing to a raid 5 array. Granted, the array is software raid, but watching live HD, my cpu hangs around 10-20%, so I think it's fine. So, I'm trying to figure out what to look at next. One final point: watching HD through the HD3000 I get occasional pixelation but if I then switch over and watch the same channel through firewire, there is no pixelation. Just seems like that points the the card.