[mythtv-users] Scanlines when Panning on Regular TV

Matt Gibson diwelf at gmail.com
Mon Feb 5 01:15:15 UTC 2007

Hello Again,

Sorry about the delayed response. I decided I would upgrade Gentoo +
MYTH SVN, and well to say the least that caused a bit of problems.
Things were crashing, mythvideo wouldn't work, etc. Finally found out
it was because gcc was upgraded to gcc 4 when fglrx drivers require
(were compiled against) gcc 3 with stdc 5.

Long story short, re-emerged gcc 3, and am using it as the default
compiler now instead of 4, and now everything is working again.

So, back to the original question. I am using RTC method for the
video, and I have set both the mythtv and mythfrontent chmod +s.

I followed the tutorial to add a new sysctl option, which I had set as
the default of 64, this has since been upped to 1024 and then again to
2048, but I still see the tearing.

echo "dev.rtc.max-user-freq = 2048" >> /etc/sysctl.conf

I don't know if opengl is working. Last time I tried to set the menus
to opengl, instead of qt, i got segfaults all over the place.

Would I be better off to screw all this and sell the video card the
system has in it now, and get myself a Nvidia 5200 based card instead?

Matt Gibson

On 02/02/07, Nick Morrott <knowledgejunkie at gmail.com> wrote:
> On 02/02/07, Matt Gibson <diwelf at gmail.com> wrote:
> > Hi Nick,
> >
> > I'm outputting to a TV, not a monitor (CRT TV). Will that still play a
> > factor here, I notice that page only mentions "PC MONITOR".
> Outputting to an interlaced display device can cause additional issues
> which I referred to as interlacing artefacts (you can see these in the
> links Osma provided also). Deinterlacing all video output is a quick
> way to reduce or eliminate these, but by using a proper interlaced
> modeline it is possible to output interlaced video from your machine
> to your TV and get a stable picture. My PVR-350 capture card produces
> flawless interlaced output, which is not so easy with my old Radeon
> card.
> > That image in the link referring to tearing, is exactly what I am seeing.
> >
> > Where do I check the option to find out what timing method I am using?
> > I can't seem to find it in the myth menus. I believe I'm using RTC
> > method right now, but assume I should check out the video card (DRI)
> > method instead.
> Frontend setup TV playback settings. If you have a working OpenGL
> installation you might want to use OpenGL vertical syncing as your
> timing timing method. Your frontend logfile will tell you which method
> is actually being used.
> Nick
> --
> MythTV Official wiki:
> http://mythtv.org/wiki/
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