[mythtv-users] Fwd: Sempron 3100 lag when viewing HD from 6200 STB

Curtis Stanford curtis at stanfordcomputing.com
Mon Jan 9 22:31:29 UTC 2006

On Jan 9, 2006, at 3:21 PM, Steve Adeff wrote:

> On Monday 09 January 2006 16:58, Curtis Stanford wrote:
>> On Jan 9, 2006, at 2:49 PM, Steve Adeff wrote:
>>> On Monday 09 January 2006 16:35, Kevin Kuphal wrote:
>>>> Adam Propeck wrote:
>>>>> Here is some more detail. ( Xrog.conf and some hdparm info) I'm
>>>>> wondering if livetv isn't playing well because of the specific
>>>>> firewire port/driver? I'm using the single port that comes with  
>>>>> the
>>>>> audigy 2 PCI card I'm using. Also, I guess I was wondering if I  
>>>>> need
>>>>> to do anything specific with the fact that I'm using an Nforce 3
>>>>> motherboard. Any tweaks that are recommended? Thanks, -Adam
>>>> I think the problem is that fundamentally, the ATI driver does not
>>>> provide hardware accelerated MPEG-2 playback and your Sempron  
>>>> cannot
>>>> handle the software decoding without choking.  If you had an
>>>> Nvidia card
>>>> that supported XvMC you could enable that which would activate the
>>>> hardware decoding and probably give you the performance you expect.
>>>> Kevin
>>> I'm going to have to agree, unless someone else is running a
>>> Sempron 3100 and
>>> able to do live HDTV I'm going to have to think this is the case. I
>>> know my
>>> Athlon64 3200+ has no room to spare playing live HD, I can easily
>>> imagine a
>>> Sempron of lower clock speed having more trouble.
>>> LiveTV requires a bit more resources from mythbackend and
>>> mythfrontend from
>>> what I've noticed.
>>> --
>>> Steve
>> That seems like a lot of power! I'm decoding HD (live and recorded)
>> on an old 2.4G Pentium4. Using the nvidia driver without XVMC I'm
>> seeing about 50% CPU usage. An Athlon64 3200+ should kick my butt. Or
>> is it an ATI problem??
>> Curtis
> weird, I've got an nvidia card. I'm using top and showing that
> mythfrontend+Xorg ~70-98% cpu usage for live and recorded 1080i  
> playback, it
> could be that my output is 1280x720 since nvidia can't do  
> interlaced output
> over DVI. Its much lower for 720p playback. I bet thats it,  
> resizing...
> -- 
> Steve

Yes, my TV only does 720p.

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