[mythtv-users] New installation, choppy video (not DMA) help request

[Joe Votour]

--- Dan <danspam at envy.themanium.net> wrote:


> On Mon, May 15, 2006 at 04:28:13PM -0400, Raphael
> Pooser wrote:
> 
> > installing fglrx.  If fglrx is working properly
> then xv should work 
> > properly too; make sure to add the option to
> xorg.conf using ati-config 
> > if the option isn't already there in the device
> section.
> > However, based on the output of xvinfo you
> provided a link to, it looked 
> > to me like you had xv working with "radeon"... so
> maybe the problem is 
> > elsewhere?  Or perhaps xv just works better with
> fglrx, not sure on that 
> 
> So, I think that last night I installed fglrx and
> got it to play nicely
> with Xv.  xvinfo reports info, similar to the
> previously posted one,
> glxinfo reports an ATI device, not "mesa", and the
> xorg.0.log looks good.
> 
> But, the performance is just as bad.  So, since I
> have seen it requested
> of others (maybe elsewhere?), I ran "mythfrontend
> --verbose all" and grabbed
> the output.  I had a few lines like below:
> 
> [root at localhost mythtv]# grep -i xvmc verbose
> 
> 2006-05-16 07:53:15.661 VideoOutputXv Error: XvMC
> output requested, but is not supported by display.
> 2006-05-16 07:53:15.681 XvMCSurfaceTypes::find(w
> 1920, h 1088, chroma 1, vld 0, idct 1, mpeg2,
> sub-width 0, sub-height 0, disp, p<= 115, 1150 <=p,
> port, surfNum)
> 2006-05-16 07:53:15.681 Trying XvMC port 115
> 2006-05-16 07:53:15.717 XvMCSurfaceTypes::find(w
> 1920, h 1088, chroma 1, vld 0, idct 1, mpeg2,
> sub-width 0, sub-height 0, disp, p<= 116, 1160 <=p,
> port, surfNum)
> 2006-05-16 07:53:15.717 Trying XvMC port 116
> 2006-05-16 07:53:19.087 VideoOutputXv Error: XvMC
> output requested, but is not supported by display.
> 2006-05-16 07:53:19.087 XvMCSurfaceTypes::find(w
> 1920, h 1088, chroma 1, vld 0, idct 1, mpeg2,
> sub-width 0, sub-height 0, disp, p<= 115, 1150 <=p,
> port, surfNum)
> 2006-05-16 07:53:19.087 Trying XvMC port 115
> 2006-05-16 07:53:19.087 XvMCSurfaceTypes::find(w
> 1920, h 1088, chroma 1, vld 0, idct 1, mpeg2,
> sub-width 0, sub-height 0, disp, p<= 116, 1160 <=p,
> port, surfNum)
> 2006-05-16 07:53:19.087 Trying XvMC port 116
> 
> I don't know if this is indicative of a specific
> problem or not.
> 
> I have the full log and will post it up somewhere if
> it'd be useful.
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>
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> 

According to your logs, you're trying to use XvMC,
which is not supported on your ATI card.  (Or any ATI
card under Linux, to the best of my knowledge).  

MythTV at the moment only supports XvMC on the nVidia
and Via cards, and XvMC Pro(?) on some Via chipsets. 
XvMC (X-Video Motion Compensation) is different than
Xv (X-Video) - the motion compensation part helps by
being able to pass some of the MPEG-2 stream decoding
off to the video card, as opposed to doing it with the
CPU.

If you disable XvMC in your frontend configuration,
then you should be fine.

-- Joe

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