Jittery MythTV

Hans Fugal hans at fugal.net
Wed Sep 7 17:10:37 MDT 2005

For the jitteriness, my guess would be that the proper kernel tuning
would take care of it. 

2.4 is currently the recommended kernel for good latency, with the
following patches:
  - preempt
  - lowlatency
  - givecap

2.6 vanilla (with the proper preempt configuration options, etc.) is
much better than vanilla 2.4, but not yet quite as good as 2.4 with the
above patches. However, when it gets there (should be any version now)
it will be there without any special patching, which will be nice.

In your case, you probably have moderate latency needs and a recent 2.6
kernel or the patched 2.4 kernel will probably help.

Or maybe that's not it at all... maybe you have an IRQ conflict or DMA
isn't turned on on your HDD, or something...

On Wed,  7 Sep 2005 at 16:56 -0600, Roberto Mello wrote:
> After resurrecting my MythTV box, I finally compiled the mythfrontend on a
> Debian Sarge box that is going to be my front to the mythtv server.
> I have two problems though:
> 1) Watching live TV is jittery. Every second the image pauses for a second
>    before continuing. I had MythTV running on the same machine several
>    months ago and it worked fine, so I don't think it's slowness.
> 2) Sound is "metallic". It's pretty bad in quality.
> Anyone have a clue on how to solve these? Much appreciated.
> Specs:
> Athlon 1.8 GHz, 512 MiB RAM, 200 GiB 7200 RPM hard drive
> MythTV 0.18 installed from KnoppMyth
> Cheapo Hauppage bt878 capture card
> Nvidia FX 5200 video card, but no nvidia driver (would it make a
> difference?)
> Thanks,
> -Roberto
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