On 6/17/07, <b class="gmail_sendername">Brian Wood</b> <<a href="mailto:beww@beww.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">beww@beww.org</a>> wrote:<div><span class="gmail_quote"></span>
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Aaron Nauman wrote:<br>>> > > I am running ivtv 0.10.3 on PVR 350 and PVR 150 on fc6 2.6.20. If<br>> I run a<br>>> > > capture test with cat<br>>> > ><br>>> > > cat /dev/video1 >
test.mpg<br>>> > ><br>>> > > The capture looks great. If I start mythtv and watch live tv, I<br>> get jitter.<br>>> > > Every couple of seconds the video pauses for a second of so.
<br>>> ><br>>> > In MythTV, what resolution/bitrate do you have set for your LiveTV<br>>> > profile for MPEG2 Hardware Encoders? If you change the resolution for<br>>> > LiveTV to 720x480 do things improve?
<br>>><br>>> Thanks for the reply Nick.<br>>><br>>> I am running with the default settings: 480 x 480 with 368K bitrate.<br>> I tried 720 x 480 and get no improvement.<br>>><br>>> I have tested my hard drive and it is getting good throughput. Any
<br>> other ideas?<br>>><br>>> Thanks,<br>>> Aaron<br>><br>> I have tried changing the resolution and bitrate settings around, with<br>> no improvement.<br>> I am getting some "NVP: prebuffering pause" messages.
<br>> I tried output through PVR-350, but still have the jitter, so I am<br>> pretty sure it is on capture.<br>><br>> I have read through the troubleshooting sections on ivtv and mythtv and<br>> everything else I can find with google and haven't found anything that
<br>> makes a difference. And that includes rebuilding the machine from<br>> scratch. I am really worried that I am going to have an expensive<br>> doorstop on my hands, unless someone can help get me on the right track.
<br>><br>> Any thoughts anyone?<br><br>What sort of system? Myth puts a significant load on system resources,<br>if you have an underpowered CPU it might work fine running a cat command<br>but fall on its knees running Myth.
</blockquote><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">What CPU and what load running Myth? Are you running X and all graphical
<br>stuff when you run your cat command? Is your RAM limited, ie" are you<br>swapping when running Myth but not when running the cat?<br><br></blockquote></div><br>I don't think it is a performance issue. I have had myth running on this machine with no jitter problems with ubuntu. I was having stability and lirc problems with Ubuntu and Jarod's howto is so nice, that I switched to Fedora.
<br><br>The machine has<br><span id="nointelliTXT"><span id="intelliTxt">Sempron 3400+ (2 GHz)<br>2 GB RAM<br><br>There is basically nothing running on the machine other than KDE that is resource intensive. No swapping happening while watching live TV, but jitter is there.
<br><br>What I find confusing is that capture with cat jitters after exiting myth. I seems that this would point to the problem. I just don't know enough about this stuff to figure it out.<br><br>Thanks,<br>Aaron<br>
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