[mythtv-users] MYthTV Playback is Choppy

[Brian Schmidt]

Thanks Brian. Sorry I didn't have more detail. I'll add what I can now, and
then I'll send more later (directly from the system).

The video chipset is an Nvidia GeForce4 MX 440. I have a separate IDE (PATA)
drive dedicated to storing the recordings. The database, OS, and Myth
program files are all on the primary drive in the system and thus separate
from the recording drive. I'll check on the CPU and mem usage and get back
to you later today. (I'm away from the system right now).

I've tried to switch desktops but I've been unsuccessful. I've tried using
switchdesk but Gnome just won't go away. Previously I had used mwm or twm
before rebuilding with FC10. I've been trying to use WindowMaker but can't
seem to get switched over.

Thanks again,
Brian

On Tue, Apr 7, 2009 at 10:23 AM, Brian Wood <beww at beww.org> wrote:

>  On Tuesday 07 April 2009 08:04:57 Brian Schmidt wrote:
> > I'm running the latest stable MythTV updated via yum on a Fedora Core 10
> > box. The machine is a Shuttle PC that is multiple years old. It has the
> > nForce2 chipset. I'm running the latest 96.43 Nvidia drivers also updated
> > via yum. The TV output is functional and is using the Nvidia drivers (the
> > Nvidia logo appears as X starts). I'm running Xorg and Gnome. I have a
> > Hauppage HVR-1600 installed and I'm receiving over-the-air ATSC digital
> > broadcasts in NTSC format.
> >
> > At first I thought the issue was the CPU and memory of my older system.
> > However, I can record shows without issue and I can play them back
> without
> > issue using mplayer. The only time my playback is choppy is when I use
> Myth
> > to play the recorded TV show back. I've been searching through the
> mailing
> > list archives and other forums for a few weeks, but I haven't been able
> to
> > resolve the issue. My best results have come when having Myth configured
> to
> > use libmpeg for decoding and chromakey for the OSD. I've tried different
> > deinterlacers and I've had mixed results. I've also followed the
> Optimizing
> > Performance on the Myth wiki along with the "Hacking MythTV" book.
> >
> > Another thing to note is that I can't seem to set any resolution other
> than
> > 1024. This box is for my parents and they do not have an HD TV, so I'm
> fine
> > with running a lower res and was hoping that might help, but X refuses
> and
> > keeps automatically switching back to 1024.
> >
> > I appreciate any help that anyone can offer me. Previously, this system
> was
> > up and running using an older version of Myth and a Hauppage analog-only
> > card.
>
> You didn't mention what your hardware actually is, beyond the mobo chipset.
>
> Playing back with Myth requires more resources than doing so with mplayer,
> and
> it's possible you are on the edge. What is your CPU usage when playing
> back?
> Are you swapping?
>
> There are things you can do to reduce load, such as running a lightweight
> window manager (or no window manager), Gnome is pretty resource intensive.
> Putting your OS and database on a separate drive from your video storage
> can
> also help.
>
> It certainly sounds as if you are running into some limiting factor in your
> system performance, you need to identify what it is.
>
> --
> beww
> beww at beww.org
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>
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