[mythtv-users] Stutter issues with HDTV

Tue Aug 17 23:09:24 EDT 2004

As far as the case goes, I was about to buy one of the Antecs.. My frontend
is bare bones and could be cooled easily.

Email me with what you'd want for it shipped.

-blam

----- Original Message ----- 
From: "Brandon Beattie" <brandon+myth at linuxis.us>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Tuesday, August 17, 2004 2:20 PM
Subject: Re: [mythtv-users] Stutter issues with HDTV

> I have a few concerns about the system, memory, and pci busses.  I have
> seen many symptoms that these may be causing problems that are being
> difficult to debug.  Every half hour, or hour, when I have a card that
> starts to record I have a second or so long pause as the card is being
> set.  At hour intervals when I have 3 cards stopping, changing channels,
> and starting back up my system basically locks up for about 6-10
> seconds.  (Including when watching a movie with mplayer).
>
> As another side, non-XvmC stutter issue, I have also
> been able to get the backend to crash several times when moving ripped
> movies from one partition to another on raid 5 and 1 configurations.  If
> I copy one movie at a time I am usually fine, if I do 2 about 1/3 times
> mythbackend just hangs, complains about not being able to write to file
> handlers, and if I do 5 mythbackend dies in a few minutes).  Playback,
> even with XvMC makes video pause if I do more than 1 copy at a time,
> and even 1 being copied causes noticible stutter in playback.  I can
> move 60MB/s write and 90MB/s read on my raid setup, CPU is not pegged
> either.
>
> Throwing CPU at the stutter problem may not make it perfect.  It can
> help, and especially if you are transcoding or commercial detecting on
> the same box that you are watching the video on.  Stuttering is not that
> bad on my athlon 2600 when using XvMC unless I'm moving a lot of data
> around the system.  My system load is often up to 7 and I don't notice
> bad stuttering.
>
> Perfect motion on a HTPC is tough, I would be curious if you think DVD
> playback on your system is smooth.  If you say yes, then it's something
> you can probably solve easily.  If no, then you should do some
> research on tvtime and see how they are trying to get around an
> imprefect display hardware.  I personally cringe when watching DVD's on
> computers, and lately in theaters I am very aware of stuttering of film
> and it's almost a disease because once you know what to look for it can
> be very distractive and can ruin a movie for me. :)
>
> I also mention some of the problems with getting smooth video in general
> on a PC on the Linux HTPC howto.  (I also finished reviewing the
> SilverStone LC01 loaded with 6 drives and 2 optical drives, put in a
> stereo cabinet and tested how well it can cool the hardware.. No
> comparison between it and the Antec Overture...  Anyone want a modified
> Overture case?  :)  )
>
> --Brandon
>
>
> On Tue, Aug 17, 2004 at 12:54:03PM -0500, john roberts wrote:
> >
> > Hi - me again - the HDTV stutter guy. :)
> >
> > The only way I've been able to get my HDTV 1080i content not to stutter
is with using XvMC enabled.  Ane I've confirmed the quality of the picture
is less then "software" enabled de-interlacing support.
> >
> > So - I'm thinking of buying a new CPU and I'm wondering what speed I
should get.
> >
> > I currently have a 2.6G P4 HT 800 FSB.  I've heard from others (Wendy on
the list) who has had stutter issues with a 3.0 P4 HT.
> >
> > Do I need to go to 3.2G?  Is this not a CPU issue?  I've had this HDTV
stutter issue with 0.15.1 and the latest (as of 8/16/04) CVS tree.
> >
> > Any thoughts before I go my a new processor?  I'm not crazy about the
idea of doing so - the darn things are expensive.  I thought by getting a
FX5500 (which would do XvMC) I wouldn't have had to do this.
> >
> > Thanks,
> >
> > -John
> > -- 
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