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

Aaron Nauman mtense at gmail.com
Wed Jun 20 04:06:13 UTC 2007


The video is encoded with the jitter.  I have played the mpg files with a
variety of players both on windows and linux.  The audio is much smoother
than live tv, but the video still freezes for half a sec or so every few
seconds.

Anymore ideas for what I might try?

Thanks,
Aaron

On 6/18/07, Aaron Nauman <mtense at gmail.com> wrote:
>
> cpu utilization is 10-12%.  I will look into Michelle's suggestions
> tomorrow.  Late night at work tonight.  Thx. A
>
> On 6/18/07, Mike Geisterfer < m.geisterfer at sympatico.ca> wrote:
> >
> >  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<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* <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
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> >  http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
> >
> > 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.
> >
> >
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
>
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