[mythtv-users] Possible XvMC prebuffering issues solution?

Jason Ferrara jason at discordia.org
Sun Dec 3 06:40:41 UTC 2006

I dug through the code, and figured out what the problem is. At least  
one of the problems.

Mythtv 0.20 has two new OSD sets, InteractiveTV and CC708 (whatever  
those are), that are always 'displaying', even when they don't  
actually have anything to display.

What this means is that those of us with systems that with mythtv  
0.19 could play back HD with XvMC fine, but would stutter when the  
OSD is active, now stutter all the time.

If you go to OSD::InitDefaults in libs/libmythtv/osd.cpp and comment  
out the InitCC708 and InitInteractiveTV calls (and rebuild mythtv),  
you'll probably find HD playback with XvMC starts working (assuming  
you don't have an XvMC configuration problem). Of course doing this  
probably breaks something. I'm not sure what the right thing to do is  
to make the CC708 and InteractiveTV OSDs behave.

I tried the above and everything seems to be working fine. Apparenty  
CC708 and InteractiveTV are something I don't use.

- J

On Dec 2, 2006, at 7:46 PM, Tom Lichti wrote:

> Michael Tiller wrote:
>> On 12/1/06, *Jason Ferrara* <jason at discordia.org
>> <mailto:jason at discordia.org>> wrote:
>>     I'm convinced that there is some sort of timing bug in the  
>> playback
>>     code.
>> I don't know enough to be convinced either way but the overall  
>> lack of
>> repeatability and solvability around this problem strongly suggests
>> this is that case to me.  Unfortunately, I'm not in a situation where
>> I can pitch in to help solve the problem. :-(
>> --
>> Mike
> I can repeat it at will with my setup. I can't solve it though.
> Tom
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