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

[Curtis Stanford]

On Jan 9, 2006, at 5:04 PM, Steve Adeff wrote:

> On Monday 09 January 2006 17:31, Curtis Stanford wrote:
>> 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.
>
> strange, I don't know. what version nvidia driver? what xorg version?
> maybe its that I'm running Debian64?
>
> any others with Athlon64 3x00+ care to chime in?
>

I'm using xorg-6.8.2 and the latest nvidia driver. I'm playing a  
1080i stream right now down converting to 1280x720 and getting 35%  
CPU usage. Kernel is 2.6.14.2 on a 2.4G P4.

Curtis