[mythtv-users] Video Stutter Problems

[Thomas W. Shelton]

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Thomas 
> W. Shelton
> Sent: Wednesday, January 18, 2006 1:02 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Video Stutter Problems
> 
> > -----Original Message-----
> > From: Jerry Rubinow [mailto:jerrymr at gmail.com]
> > Sent: Wednesday, January 18, 2006 12:54 PM
> > To: Thomas W. Shelton
> > Subject: Re: [mythtv-users] Video Stutter Problems
> > 
> > On 1/18/06, Thomas W. Shelton <twshelton at hrtoolbox.com> wrote:
> > >
> > > Hello,
> > >
> > > I have scoured the list and the Internet and discovered a
> > lot of good
> > > information ... none of which has corrected my problem.
> > >
> > > I'm running on
> > >
> > >  - Dell 2.4GHz/512M ram
> > >  - pcHDTV 3000 Card
> > >  - nVidia GeForce FX 5200
> > >  - using NTSC with cable -- no cable box.
> > >  - Have Video for Linux card specified -- not the
> > pcHDTV(wanted to get
> > 
> > > the basics working first)
> > >
> > > using the latest stable branch from SVN compiled with 
> --enable-Xvmc.
> > > I have "v4l" defined in my xorg.conf file.  I also have 
> Xvmc defined
> > in the setup.
> > > I believe I have also turned off all commercial flagging.  
> > (specifics
> > > of which settings to check might help).  The processor 
> also spikes 
> > > when I run glxgears ... not sure if that means anything.
> > >
> > > When I started the image quality was terrible.  I have 
> been able to 
> > > significantly improve the quality but it still stutters.  I
> > ran "top"
> > > and both mythbackend and mythfrontend are consuming all available 
> > > resources when watching TV.
> > >
> > > I feel like I'm making improvements but have run into a wall.
> > >
> > > Any thoughts?
> > 
> > > For the backend, dumb question - is dma enabled on the disk(s)?
> > >
> > > For the frontend, I had to recompile with processor specific 
> > > optimizations before I got reasonable CPU usage.
> > >
> > > YMMV.
> > >
> > > -Jerry
> > 
> > On 1/18/06, Thomas W. Shelton <twshelton at hrtoolbox.com> wrote:
> > > Yes DMA is enable ... I was getting writes of about 
> 50m/sec when I 
> > > tested.
> > >
> > > I'll disable OpenGL and recompile with some optimizations.  I'm 
> > > running Kubuntu ... Any thoughts on where to find optimizations ?
> > >
> > > Thanks for the help ...
> > 
> > Try adding --enable-proc-opt to ./configure.
> > 
> 
> 
> OK ... I did that orinally ... I'll keep at it and let you 
> know if the OpenGL removal helps.

Cool.  I removed the OpenGL vsync and now the video does not stutter and
the CPU utilization has dropped to around 30% for the frontend and
30-40% for the backend.  Should it be this high?

However, now when I attempt to change channels, the frontend locks up
and the backend seg faults.

I'm at a loss here.

Thomas