[mythtv-users] More XvMC data points
michael.tiller at gmail.com
Fri Dec 1 18:52:51 UTC 2006
On 12/1/06, Patrick Ouellette <pat at flying-gecko.net> wrote:
> On Fri, Dec 01, 2006 at 12:07:11PM -0500, Michael Tiller wrote:
> > built MythTV from SVN recently and specifically looked and it said
> > like "OpenGL Sync: Disabled" or some such thing. That is the correct
> > setting right? (i.e. the default setting)
> I was told to try turning it on and it seems to work for me.
I'm just starting wonder how many of these claims have actually been
substantiated. :-) So many XvMC related issues seem to be "try standing on
your head and rubbing your stomach". I'm always left wondering "Are you
sure this makes any difference?" :-)
> using the latest NVidia driver
> > I've got a 440 MX using the 8776 driver.
> 9629 driver. Check the AGP settings in the xorg.conf to be sure you age
> really getting full speed out of the AGP.
It's not an AGP card.
Partially, if you enable the OpenGL vblank at compile time, you get a
> check box in the TV Playback setup screen too (same screen that sets
> "use video as timebase" I think).
I get that setting even without enable OpenGL vsync.
> soundcard buffer settings
> > By this do you mean turn on extra audio buffering during playback? (in
> > Playback settings on the front end)
> You can try it - for my system it helps to have it turned on with the
> 9629 video driver, but off with the 8776 driver (don't know why).
> I will say XvMC output really, really, really, really sucked on my
> system before 8776, and 9629 is even better.
I'll have to try 9629 just to cover all the bases but I'm not optimistic.
> and dot clock in my modeline have significantly improved my XvMC output.
> > I'm lost here. I've tried adding my own modelines but it always
> > they aren't valid
There is a modeline calculator at
> Something around this should be close:
> Modeline "720x480 at 60i" 12.60 720 752 792 824 480 491 494 505 interlace
I still get:
(II) NVIDIA(0): Assigned Display Device: TV-0
(WW) NVIDIA(0): No valid modes for "1024x768_60"; removing.
(WW) NVIDIA(0): No valid modes for "720x480 at 60i"; removing.
(WW) NVIDIA(0): No valid modes for "720x480_60"; removing.
(WW) NVIDIA(0): No valid modes for "NTSC_60i"; removing.
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0): "1024x768"
(II) NVIDIA(0): "720x480"
(II) NVIDIA(0): Virtual screen size determined to be 1024 x 768
I'm putting the Modeline here:
> Identifier "Monitor0"
> VendorName "Monitor Vendor"
> ModelName "27in Analog TV"
> HorizSync 30.0 - 50.0
> #VertRefresh 60.0 - 60.0
> Option "dpms"
> Option "UseEdidDpi" "FALSE"
> Option "DPI" "100 x 100"
> ModeLine "NTSC_60i" 14.318 768 784 848 910 483 484 492 525
> Modeline "720x480_60" 26.72 720 736 808 896 480 481 484 497
> -HSync +Vsync
> Modeline "720x480 at 60i" 12.60 720 752 792 824 480 491 494 505
...is this the right place. I notice that it names the device "TV-0". Do I
have to use the same name for my monitor?!?
The calculator should be able to come up with something that works. The
> driver restricts modelines depending on the output format and tv
> option "TVStandard" "NTSC-M"
> Option "TVOutFormat" "SVIDEO"
Exactly what I have.
or change SVIDEO to COMPOSITE for composite out.
> If you are using an external converter, you should be able to get a
> wider variety of modelines to work.
I'm thinking I'm doing something fundamentally wrong since no Modeline I put
in the file seems to work?!?
DISCALIMER: I run the SVN-HEAD version of Myth, YMMV for release
I'm running the fixes branch from SVN.
Thanks for all the help.
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