[mythtv] XvMc-OpenGL and OpenGL-OSD

Daniel and Mary-Beth Sherwood jackanddougal at yahoo.co.uk
Tue Apr 29 21:21:05 UTC 2008


Thanks for your response, your link to the original submission gave me the clues I needed and having read up a bit about what is being done, I agree that in it's current implementation (with the copy from the XvMC surface to the GLX p-buffer) ths isn't going to fly on my machine (ashame) however I do still have a few of follow up questions...

***Q1*** Although it is slow, I would still expect it to work (i.e. display the video and OSD corerctly).  I suspect some form of mismatch between the colourspace and/or bit depth and/or stride of the two buffers.  I suspect the other ticket you linked is probably a similar issue.  Any thoughts where to start looking at this?

***Q2*** The copy from XvMC to p-buffer is obviously an expensive operation.  Does anyone (danielk) know if it is possible to skip this step in any way and if so, are there ant plans to progress this?  

I am a very experienced software engineer and I am willing to put effort into looking at this is someone can a) give me pointers and b) indicate that I am not completely wasting my time given the low-power CPU I am aiming at:)



--- On Tue, 29/4/08, Michael T. Dean <mtdean at thirdcontact.com> wrote:

> From: Michael T. Dean <mtdean at thirdcontact.com>
> Subject: Re: [mythtv] XvMc-OpenGL and OpenGL-OSD
> To: "Development of mythtv" <mythtv-dev at mythtv.org>
> Date: Tuesday, 29 April, 2008, 7:54 PM
> On 04/29/2008 02:44 PM, Daniel and Mary-Beth Sherwood wrote:
> > ***Q1*** Please can someone confirm that XvMCW
> doesn't support XvMC-OpenGL
> http://www.gossamer-threads.com/lists/mythtv/commits/202450#202450
> Notice the name, "nVidia XvMC copy to texture
> extension".
> > ***Q2*** What is the current state of this
> configuration?  Is it stable and working? or is this
> behaviour expected?
> >   
> Pretty sure it's not really "supported" on
> 0.21 (which is--at least part 
> of the reason--why the packagers don't enable it).
> > For the record, here are some other bits of
> configuration info:
> >
> > CPU:     PIII 866MHz
> >   
> I'm pretty sure you're going to need a much bigger
> processor for it to 
> work properly.  IIRC, it's not even close to optimized.
> See, also, http://svn.mythtv.org/trac/ticket/4813 .
> Mike
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