[mythtv-users] My Perennial Problems with XvMC

Norm Dugas normdugas at yahoo.ca
Tue Sep 19 04:43:04 UTC 2006

On Sun, 2006-09-17 at 22:51 -0300, Dylan Semler wrote:
> On 9/17/06, Norm Dugas <normdugas at yahoo.ca> wrote:
> > I think that opengl_vsync is an issue if you actually tick the box.
> Yeah, I'm pretty sure that this is the case as well, however when I
> last reported that I had used --enable-opengl_vsync in configure,
> people commented that that was likely the problem.  But I'm with you,
> it should only matter if it's actually checked.
> > I'll check my FE and let you know what options I have enabled there.
> > Who knows, maybe you've got something checked that is messing other
> > things up.  If I recall, I've only got XvMC and BOB deint turned on.
> > Nothing else.  As I said, I'll confirm that.
> I've played with most of the settings, nothing really seems to make a
> difference.  But it would be good to know exactly what works.
> > I think I saw you were going to go back to FC5.  Have you done this?
> Yeah, that's what I've been running for the past few posts.
> > Not to state the obvious again: make sure the nvidia module is loaded,
> > make sure xorg is using the nvidia module.
> Of course, it's always good to double check these things.  On this
> current install of FC5 I have verified that XvMC is working with
> mplayer so the nvidia/X settings should to be correct.
> > I recall you had 2
> > monitors/TVs hooked up to this card.  Have you tried launching myth on
> > the other monitor/tv?  Just trying to see if this might be the card.
> > Forgive me if you've posted this: are you using mirrored desktops on
> > your video card for the 2 monitors/TVs?
> After seeing that the other gentleman was having success with the 6200
> through his DVI port, I turned off twinview and tried running myth
> singlehead through the DVI port and then singlehead through the VGA
> port.  This made no difference.  So once again I'm back to TwinView,
> which if you're not familiar is like Xinerama (spanning desktop).


I went through my FE to confirm my settings.  I am indeed using Bob
deinterlacing and Standard XvMC.  Something that came to mind while
looking at the settings is that I recall having audio issues and in the
process of figuring those out, I had turned on things like agressive
audio buffering and use video as a time base.  I had to turn those off
in order to stop the st-st-stuttering.  These audio settings were
affecting all playback, not just HD.  Since you've confirmed that XvMC
is working using mplayer, then this has to be something in your myth
setup.  I would start by turning all of the optimizations off with both
audio and video and make sure that SD plays back fine.  I used libmpeg2
when I was doing this.  Once SD is fine, only enable XvMC.

If this leads nowhere, when launching mythfrontend, can you try
"mythfrontend --verbose playback", then launching an HD
program/recording, watch about 5 seconds, then exit out and send this
output.  It shouldn't be very bug, maybe 30 - 40 lines based on .19 and
viewing about 5 seconds of a recorded HD movie.

Hopefully we'll get your HD running soon

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