[mythtv-users] Playback stoppyand go-y. Ie super-duper-uber-jittery.

[Kevin Kuphal]

Greg Stark wrote:
> Kevin Kuphal <kuphal at dls.net> writes:
>
>   
>> Greg Stark wrote:
>>
>>     
>>> Ok, it seems it uses XF86VidModeGetModeLine to calculate a refresh rate. And
>>> the ATI driver appears to be giving a bogus value that makes mythtv think the
>>> refresh rate is 434Khz. I could see how that would confuse mythtv.
>>>
>>> I submitted an xorg bug report:
>>> https://bugs.freedesktop.org/show_bug.cgi?id=6421
>>>   
>>>       
>> Greg, is there a way to query this value from X-windows or even the 
>> command-line?  I've been having problems getting some of my systems 
>> working with XvMC and I'm wondering if I'm experiencing the same thing 
>> and I could check it easily remotely (I'm impatient and can't wait until 
>> I get home tonight :) )
>>     
>
> Well you could try running xvidtune remotely with your display set to a nearby
> X display. But I think by default xvidtune is specifically blocked from being
> used remotely.
>
> Or you could run this little test program I attached. I'm not sure what
> correct output would look like though. Perhaps if someone ran it on a working
> system too that could be helpful.
>   
A little combination of your script and some xauthority files generated 
this from my GeForce MX4400 system:

dot_clock: 40000
 hdisplay: 800
 hsyncstart: 840
 hsyncend: 968
 htotal: 1056
 vdisplay: 600
 vsyncstart: 601
 vsyncend: 605
 vtotal: 628
 flags: 5
 privsize: 0
rate: 60.316541

and on my Unichrome Pro system

dot_clock: 40000
 hdisplay: 800
 hsyncstart: 840
 hsyncend: 968
 htotal: 1056
 vdisplay: 600
 vsyncstart: 601
 vsyncend: 605
 vtotal: 628
 flags: 5
 privsize: 0
rate: 60.316541

So I guess I'm not seeing this specific problem.  I'm just getting alot 
of prebuffering pauses when using XvMC even though I can play back the 
same content in software which seems strange since it is supposed to 
reduce the load

Kevin