[mythtv] XvMC VLD Decoding stuttering problems on some videos

Terry Barnaby terry1 at beam.ltd.uk
Sun Sep 24 21:49:49 UTC 2006


Terry Barnaby wrote:
> Stuart Auchterlonie wrote:
>> On Fri, Sep 22, 2006 at 08:42:29PM +0100, Terry Barnaby wrote:
>>> Does anyone have any clues on where to look to solve this problem ?
>>>
>>>
>> Right this is interesting
>>
>> Working:
>>> 2006-09-20 07:14:15.557 XvMCSurfaceTypes::find(w 544, h 576, chroma 1, vld 1, idct 0, mpeg2, sub-width 0, sub-height 0, disp, p<= 68, 680 <=p, port, surfNum)
>> Not working:
>>> 2006-09-20 07:15:52.405 XvMCSurfaceTypes::find(w 720, h 576, chroma 1, vld 1, idct 0, mpeg2, sub-width 0, sub-height 0, disp, p<= 68, 680 <=p, port, surfNum)
>>
>> So the difference between the streams is 544x576 vs 720x576.
>>
>>
>> Stuart
>>
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> 
> Yes, it is a different resolution. It is probably also from a different 
> DVB-T channel and so has probably other MPEG differences.
> 
> I have further tracked this down to the system occasionally taking a 
> long time (> 200ms) in XvMCPutSlice2(). So this points to the XvMCVLD 
> library/via X driver/hardware although this does not tally with the fact 
> that xine plays the same video file fine ...
> 
> I will investigate a bit further.
> 
> Terry
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Hi, got a bit further, it was'nt XvMCPutSlice2() taking > 200ms it was
the X11L performed as part of X11S. So something has locked the internal
MytTv XServer lock but not released it ....
Any ideas ? Will test a bit further.

Terry



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