[mythtv-users] XvMC - Nvidia isssues?

[Kevin Kuphal]

Dan Seddon wrote:
> Hi
> This is my first post to the list after getting my system up and 
> running. I have a Mythtv setup which I'm really pleased with it's 95% 
> perfect! However - that remaining 5% is always worth persuing so... I'm 
> using XvMC which means my Athlon XP 1600 trundles away at 15% usage 
> whilst playing DVB-T (standard definition PAL) video. This has 3 issues 
> which reading through the list have been mentioned on and off - but I 
> haven't found all the answers.
>
> First off - the menus become monochrome, which isn't a biggy and worth 
> putting up with for the performance gain (but it would be nice to know 
> if this is preventable).
>   
Search the archives or http://svn.mythtv.org for ChromaKey OSD.  I'm not 
sure if this was put in before 0.18 or not, but in SVN you can enable a 
setting in the database to use a 16 color OSD for XvMC use and on mine 
it works great.
> Lastly the problem which I count as my final 5% - I have an issue with 
> some programs where the video stutters (the video may stutter in time 
> too, but it's hard to tell when your ears are hurting). It's been a 
> complete bafflement to me as it happens on only some programs (not 
> channels) and non of the configurations I've tried get rid of it (other 
> than diabling XvMC) - playing the same .nuvs with mplayer reveals that 
> the only unique characteristic of these recording seems to be that the 
> audio is at 256 kbits, whereas most of the other recording I have are at 
> 192... I haven't been very scientific in checking it - but it seems to 
> be consistant, having checked a few recordings. It happens to about 1 in 
> 5 recordings, or maybe less, at the moments - but is fustrating as I 
> have to go in to my options and reconfigure everytime I want to watch 
> such a recording. I've only seen this issue posted once by a guy who 
> said he was using the via equivalent of XvMC (I haven't found his post 
> again - as it was a while ago) - which might be important as is implies 
> it isn't a driver problem (I get the same issue when running the 
> frontend on my laptop with a completely different sound card and older 
> Quadro card). Is anyone else familier with this problem? I'm in the UK - 
> where we don't have HDTV yet, so I can't be that my systems overwhelmed 
> by what I'm throwing at it?
>   
Are you using OpenGL Vsync?  Seems any Nvidia driver above 7676 (which 
I'm use with great success) has problems with OpenGL Vsync enabled.

Kevin