[mythtv-users] Stuttering video and audio with MythDVD

Michelle Dupuis support at ocg.ca
Wed Jul 4 03:40:05 UTC 2007

Are you sure XvMC is unecessary?  I thought that turning this on simply
tells the GPU to handle motion compensation instead of the CPU. 

Wouldn't turning it off make the image worse?

-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Tom Greer
Sent: Tuesday, July 03, 2007 6:52 PM
To: Discussion about mythtv
Subject: Re: [mythtv-users] Stuttering video and audio with MythDVD

On 7/3/07, Joel Michael <joel at gimps-r-us.com> wrote:
> Edward Coffey wrote:
> > I'm afraid I can't offer any help, but I can confirm it's happening 
> > for me too. I just installed a DVD drive and I get the same issue 
> > unless I turn off XvMC. At this point I've only just started
> >
> > Does anyone know if there's a way to tell MythDVD to use "Standard"
> > while leaving XvMC on for normal television viewing?
> >
> I haven't tried this for a while, as I've built a new frontend since I 
> originally reported this.  I don't think it stutters for me anymore, 
> but it still crashes when getting to the title screen.
> Previous FE hardware:
> CPU: AthlonXP 2500+ (Barton)
> Motherboard: Asus A7N8X-Deluxe (rev 2)
> Ram: 1GB DDR
> Video: Generic NVidia 6200 128MB
> ODD: LG IDE DVD drive
> OS: Gentoo
> Kernel: 2.6.20
> Current FE hardware:
> CPU: Core 2 Duo 6420
> Motherboard: Asus P5B-VM (I think)
> Ram: 1GB DDR2
> Video: MSI NVidia 7600GS 256MB
> ODD: Samsung SATA DVD writer
> OS: Gentoo
> Kernel: 2.6.21
> Both systems were hooked up to a Sony 40X2000 (40" LCD), via a 
> DVI->HDMI cable, running at the panel's native resolution of 1920x1080
> Can you see anything in common here?  The "switch off XvMC to watch 
> DVD's, switch on XvMC to watch High-Def recordings" is lowering the 
> WAF a bit (although, the overall WAF is steadily rising).


XvMC is a solution for systems that lack the horsepower to decode the video
output.  XvMC comes with a whole lot of baggage (problems fast
forwarding/rewinding, OSD limitations and reliability problems).

With your current CPU, there should be no reason to use XvMC.

If you turn it off and have any stuttering, then you need to optimize your
system.  You do that by looking at your log files.  There are a lot of
answers in the wiki and the archives.  And, as always, google is your

Good luck.

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