[mythtv-users] XvMC Problem and Question

[Brad Fuller]

Brian Wood wrote:
> On Feb 10, 2006, at 1:11 PM, Brad Fuller wrote:
>
>   
>> Brian Wood wrote:
>>     
>>> On Feb 10, 2006, at 12:50 PM, Brad Fuller wrote:
>>>
>>>
>>>       
>>>> Michael Chmilar wrote:
>>>>
>>>>         
>>>>> I am using Gentoo x86_64 on an Athlon-64, latest NVidia 81xx  
>>>>> driver,
>>>>> opengl vsync disabled, Standard XvMC selected in mythfrontend,  
>>>>> kernel
>>>>> deinterlacing, NVidia fx5200 card.
>>>>>
>>>>> Playback is smooth. No stuttering when the OSD comes up, but  
>>>>> there is
>>>>> an audio drop-out for a moment when the OSD appears, and again when
>>>>> it disappears.
>>>>>
>>>>>
>>>>>           
>>>> Interesting... my audio is perfectly fine, it's just the video that
>>>> jumps around until the OSD is gone. And this only happens in "cpu
>>>> intensive" HD content.
>>>>
>>>>         
>>>>> I was getting some stuttering until I checked "enable realtime  
>>>>> thread
>>>>> priority" and made mythfrontend suid.
>>>>>
>>>>>
>>>>>           
>>>> I have "Enable realtime priority threads" checked.
>>>>
>>>> How do you do run mythfrontend suid. I will search for this in the
>>>> archives.
>>>>
>>>>
>>>>         
>>> chmod +s /usr/bin/mythfrontend  (as root)
>>>
>>>       
>> Thanks.
>> I just tried it. And, when FF the video just freezes and I get the  
>> warnings:
>> "prebuffering pause"
>> over and over. Had to Ctrl-C out of mythfrontend
>>
>> I also get the warning (when going to HD content):
>> "realtime priority would require SUID as root"
>>
>> After I:
>> chmod -s /usr/bin/mythfrontend
>>
>> Then, no problem (except of course, the original problem of frames  
>> that jump around when when the OSD is present. BTW, I tried this on  
>> two programs Lost and Dancing with the Stars (both ABC, SF  
>> Bayarea)  - both had stuttering audio with the frames. So, I guess  
>> I was wrong about saying that the problem was only video)
>>
>> brad
>>
>>     
> Well there is a warning on the "realtime priority threads" to disable  
> it if video freezes on playback.
>   
note that I always had that on. It's when going suid that it freezes.
> Guess there's a reason for the warning :-)
>
> What's your CPU load when playing without suid?
>   
 around 20%-30%
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