[mythtv-users] What do I have to do to get HD working?

[Marco Nelissen]

>Marco Nelissen wrote:
>>> I'm about at my wits end.  I just purchased a P4 3.2ghz HT to do HDTV 
>>> playback in software but no matter what I do, I get continual studdering 
>>> and "Video X frames ahead of audio" on my HD playback material.  This 
>>> happens on my MX4000 PCI video card system, my ATI 9100 IGP video card 
>>> system, and my Unichrome Pro video card system. 
>>>
>>> Everything I read said that a P4 3.2 is enough to do HD but nothing I do 
>>> can get it to work.  I'm running the 2.6.15 smp kernel but that almost 
>>> seems to make it worse.  With the non-smp on my Unichrome system it 
>>> plays back but only at about 17-20 fps.  With the smp kernel, it does 
>>> the 29-30 but jumps and skips complaining about the video ahead of audio.
>>>
>>> Please, anyone have any help?
>>>     
>>
>> Forget about getting it to work with a PCI video card. The PCI bus doesn't
>> have the bandwidth for HD video.
>>   
>This is why I moved to the Unichrome Pro and ATI IGP 9100 systems.  I 
>have an MX440 AGP I can use as well as a 6200 nvidia.  But even on the 
>Unichrome Pro which, should by all accounts, be able to do this, I still 
>had the same problems.  BTW, I'm driving 800x600 on an SD TV, not an HDTV

Could it be that software-scaling is killing performance?