[mythtv-users] Mythfrontend video timing methods explained
dm at netsol.com.au
Fri Sep 30 03:36:33 UTC 2005
I have been trying to work out what is the best video timing method to
use for mythfrontend. I am guessing that using the right timing will
improve the deinterlacing of analogue tv signals. In my case, I'm
running an Nvidia gforce 5200 mx agp card, connected via dvi to my
plasma screen. DVB signals look great on the screen, but analogue tv is
woeful. I have experimented with the various filters in mythfrontend and
have settled on bob as the best compromise, however because my monitor
only wants to run at 60hz instead of 50hz (i'm in pal land), this makes
the osd flicker, and the picture is a bit flickery as well.
Even though I've got "use openGL Vsync" selected in the front end
settings, the frontend only ever uses USleep with busy wait timing.
I suspect that I may be able to improve things by changing my Xorg.conf
file or my nvidia settings, but I'm not really sure what works when
using dvi, as opposed to tv out.
Any clarification of all this would be welcome, I did find a post
(below) on the ATRPMS site that mentions the different timing methods,
but I've been unable to find out what are the pros and cons of the
"I compiled Myth last night and the OpenGL sync works great on both of my
NVidia cards. I didn't have time to try the ATI card. The first sync
method to be available is what will be used:
1. NVidia sync (4363 driver only)
2. DRM sync (not sure what this is)
3. OpenGL sync (but has to be enabled in settings.pro, not sure if it
works on other cards, will test tonight)
4. RTC sync
5. Busy Wait
So basically if it fails on one of the sync methods it will try the next
one. Busy Wait should work on all systems. I will test more tonight.
Axel Thimm wrote:
> Thanks, sounds reasonable. Would you also test it on non-OpenGL
> or non-nVidia systems (that's where my concerns are)? Anyone else?
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