[mythtv-users] Stutter issues with HDTV

john roberts homepagez at lycos.com
Tue Aug 17 19:44:54 EDT 2004

Wow - lots of good info coming in from everyone.  This is great.

To answer a few questiosn:

1) Yes :)  I have an SMP kernel (2.6.7) on the HT 2.6G P4
2) I have re-niced the frontend - but haven't tried re-nicing the X server - I'll have to try that
3) It's a combo mythtv box (frontend+backend on same box)

I'll have to check into the ARCH option in the video combo libraries.  Good tip!

BTW - about overclocking... I know not a great thing to do since it can cause long-term damage to the chip.  But - how does one do overclocking under linux?

Thanks for everything everyone - great info,


----- Original Message -----
From: John Patrick Poet <john at BlueSkyTours.com>
Date: Tue, 17 Aug 2004 15:26:07 -0600 (MDT)
To: Discussion about mythtv <mythtv-users at mythtv.org>
Subject: Re: [mythtv-users] Stutter issues with HDTV

> On Tue, 17 Aug 2004, john roberts wrote:
> >
> > I've got ARCH set as pentium4 - so I don't believe that's the issue.  And yes you are correct - a world of difference when not set to pentium4.
> >
> > Also - I do a nice --adjust=-5 or something when I start the frontend - so I believe that's ok.
> >
> > I'm thinking 2.6G is just not fast enough.  I believe the note on having a 2.8 or greater is correct - it seems I'm on the threshold of it working.
> >
> > Thanks for the info,
> >
> > -John
> I have run it on a 2.6GHz with acceptable results.  Two things were
> critical:  enabling Hyper-Threading, and getting the AGP setting right.
> Depending on your motherboard, using nVidia's AGP is either a win or a HUGE
> loose.  Going to a nVidia FX-5700LE also helped.
> Also note, setting "-march=pentium4" in settings.pro does *NOT* effect the
> options used to compile the A/V decoding libraries.  Those options end up in
> config.mak after you do the ./configure.  I have had good look using
> something like "-O4 -march=pentium4" in the config.mak file.
> Doug also discovered that "nice"ing X to a higher priority helps.  X should
> actually be at a higher priority than mythfrontend, which should be at a
> higher priority than other general apps.
> Is your machine a Backend/Frontend combo, or just a frontend?  Splitting the
> backend and frontend onto different machines also helped for me.  The
> backend can actually be a pretty lowely machine -- it just needs a good disk
> system.
> John

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