[mythtv-users] VDPAU playback stuttering when XvMC playback is just fine?

Dave Johansen davejohansen at gmail.com
Thu Apr 30 04:42:57 UTC 2009


On Wed, Apr 29, 2009 at 8:52 PM, Phil Wild <philwild at gmail.com> wrote:
>>>
>>
>> What interlacer are you using? Would it be temporal 2x?
>>
> Sorry - just noticed from the thread that you are using bob 2x. Just
> out of interest, what if you changed to a 1x de-interlacer. Does that
> make any difference?

I just tried switching it to Advanced 1x and it still stuttered, so I
tried it with no deinterlacer at all and it still stuttered.



On Wed, Apr 29, 2009 at 7:54 PM, R. G. Newbury <newbury at mandamus.org> wrote:
> Dave Johansen wrote:
>>
>> On Wed, Apr 29, 2009 at 4:20 PM, Jean-Yves Avenard <jyavenard at gmail.com>
>> wrote:
>>>
>>> Hi
>>>
>>> 2009/4/30 Dave Johansen <davejohansen at gmail.com>:
>>>>
>>>> I have the extra buffering checked, but where do I find the "audio
>>>> buffer appear smaller" option, so I can make sure it's unchecked?
>>>
>>> Q: I get stuttering  every few seconds with errors like "NVP: Video is
>>> 3.12705 frames behind audio (too slow), dropping frame to catch up."
>>>
>>> A: Check your settings: In General: make sure "Aggressive sound card
>>> buffering" is unckecked
>>>
>>> In TV -> Playback "Extra audio buffering" is checked.
>>
>> I just checked and "Aggressive sound card buffering" is unchecked and
>> "extra audio buffering" is checked, but I still get stuttering.
>>
>
>
> Two further things to try. I was getting intermittent freezes with NVP
> errors. The fixes below dealt with the specific problem I had, and *may*
> help your situation.
>
> 1) Make sure that 'Real-time priority' is unchecked (Same settings page as
> 'extra audio buffering',

I already have "real-time priority" unchecked.

> 2) Add  'Option "TripleBuffer" "true" to the Device section of your
> xorg.conf file. This 'steals' memory which the driver has allocated for 3D
> and uses it for 2D buffers. Since TV playback is pure 2D this is what we
> want. (After editing xorg.conf use Control-Alt-Backspace to re-start  your
> desktop.)

I will give this a try and see if it helps with the stuttering.

Dave


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