[mythtv-users] HD plays fine, SD jerky video and sound?

[Mark Hutchinson]

aaron wrote:
> On 2/7/08, Mark Hutchinson <mark at onnow.net> wrote:
>   
>> Live tv from mythfrontend, HD channels are fine, SD channels are very
>> jerky with stuttering sound.
>>
>> I have tried many many things.  Ideas on how to diagnose this?  No
>> really anything in the frontend or backend logs.
>> How can SD be harder or more intensive to play than HD?
>>
>>     
>
> This might be way off, but if there's no Xv, Myth will need to do
> software scaling, right? Could it be that it takes more effort to
> scale the SD resolution (which would be something like 720x480) up to
> 1920x1080 than to (decode HD + scale to 1080) ?
>
>   
Can anyone verify if this is the case?  Software scaling on SD content?  
I have a 8600 Nvidia card, that DOES NOT have xv.  Would downgrading to 
a 7300 with xv help?