[mythtv-users] Adventures in HDTV - Notes from the trenches
Jesse Guardiani
jesse at wingnet.net
Mon Dec 19 09:38:35 EST 2005
Matt Mossholder wrote:
> On Mon, 2005-12-19 at 07:53 -0500, Doug Larrick wrote:
>> Matt Mossholder wrote:
>> > Here are a few links to other people experiencing the VBlank
>> > problem. Basically, if I have VBlank enabled, and play back video
>> > content with Xv, the system hangs. On further inspection it isn't
>> > limited to DVI...
>> >
>> > http://www.nvnews.net/vbulletin/showthread.php?t=56384
>> > <http://www.nvnews.net/vbulletin/showthread.php?t=56384&highlight=xvideo+vblank <http://www.nvnews.net/vbulletin/showthread.php?t=56384&highlight=xvideo+vblank>>
>>
>> If I'm understanding correctly, if (in nvidia-settings) "X Server XVideo
>> Settings -> Video Texture Adaptor -> Sync to VBlank" is checked, it
>> hangs? Then don't do that! Instead, to avoid tearing, uncheck that
>> setting, and make sure MythTV is using OpenGL vsync. This is the *only*
>> way to get tearing-free, stutter-free playback out of MythTV, because
>> it's one of only two video timing methods (the other working only with
>> ancient nVidia drivers, like 4xxx) that measures when the vertical
>> retrace happens.
>>
>> -Doug
>>
>
> Doug,
> Thanks for pointing out that I am an idiot ;) I had been assuming
> that the reason that Myth wasn't using opengl-vsync, even though I had
> compiled in the support, was because of the Sync to Vblank settings
> in nvidia-settings. Your prompting made me take another look, and
> realize that the version of 0.18.1 that I have is missing the defines
> to enable OpenGL VBlank syning. Compiling now... and crossing my
> fingers :)
Is that a configure option? Wondering if it's on by default in Gentoo's
0.18.1 when compiled with nVidia support.
--
Jesse Guardiani
Programmer/Sys Admin
jesse at wingnet.net
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