[mythtv-users] ivtv capture is good, but mythtv hoses it

[Mike Geisterfer]

At 6/18/2007 - 08:58 AM, you wrote:
>Does is jitter if played outside myth?  Is XV enabled on your video 
>card?  Does Xine play it ok?
>
>If the video encoded ok?  (Have you played it back on another machine)?
>
>
>----------
>From: mythtv-users-bounces at mythtv.org 
>[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Aaron Nauman
>Sent: Sunday, June 17, 2007 10:44 PM
>To: Discussion about mythtv
>Subject: Re: [mythtv-users] ivtv capture is good, but mythtv hoses it
>
>On 6/17/07, Brian Wood <<mailto:beww at beww.org>beww at beww.org> wrote:
>Aaron Nauman wrote:
> >> > > I am running ivtv 0.10.3 on PVR 350 and PVR 150 on fc6 2.6.20.  If
> > I run a
> >> > > capture test with cat
> >> > >
> >> > > cat /dev/video1 > test.mpg
> >> > >
> >> > > The capture looks great.  If I start mythtv and watch live tv, I
> > get jitter.
> >> > >  Every couple of seconds the video pauses for a second of so.
> >> >
> >> >  In MythTV, what resolution/bitrate do you have set for your LiveTV
> >> >  profile for MPEG2 Hardware Encoders? If you change the resolution for
> >> >  LiveTV to 720x480 do things improve?
> >>
> >> Thanks for the reply Nick.
> >>
> >> I am running with the default settings: 480 x 480 with 368K bitrate.
> > I tried 720 x 480 and get no improvement.
> >>
> >> I have tested my hard drive and it is getting good throughput.  Any
> > other ideas?
> >>
> >> Thanks,
> >> Aaron
> >
> > I have tried changing the resolution and bitrate settings around, with
> > no improvement.
> > I am getting some "NVP: prebuffering pause" messages.
> > I tried output through PVR-350, but still have the jitter, so I am
> > pretty sure it is on capture.
> >
> > I have read through the troubleshooting sections on ivtv and mythtv and
> > everything else I can find with google and haven't found anything that
> > makes a difference.  And that includes rebuilding the machine from
> > scratch.  I am really worried that I am going to have an expensive
> > doorstop on my hands, unless someone can help get me on the right track.
> >
> > Any thoughts anyone?
>
>What sort of system? Myth puts a significant load on system resources,
>if you have an underpowered CPU it might work fine running a cat command
>but fall on its knees running Myth.
>
>
>What CPU and what load running Myth? Are you running X and all graphical
>stuff when you run your cat command? Is your RAM limited, ie" are you
>swapping when running Myth but not when running the cat?
>
>
>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.
>
>The machine has
>Sempron 3400+ (2 GHz)
>2 GB RAM
>
>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.
>
>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.
>
>Thanks,
>Aaron
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Have you looked at cpu usage -- Top,
I have the same issue on 1 machine, with xorg hogging the cpu..
I DON"T have an answer yet.

mike g.

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