[mythtv-users] How to minimize CPU usage

[Kevin Kuphal]

Bob wrote:
> Jerry Rubinow wrote:
>   
>> On 1/30/06, Boleslaw Ciesielski <bolek-mythtv at curl.com> wrote:
>>     
>>> Jerry Rubinow wrote:
>>>
>>>       
>>>> PVRs have existed for a while, but not HD-resolution PVRs - they're
>>>> pretty recent.  If X is in a 24-bit depth mode, then I don't see where
>>>> my numbers are off - 24 (bit depth) * 1280 * 720 (screen res) * 30
>>>> (fps) = 630+ Mbits/sec.
>>>>         
>>> 720p is (usually) 60fps.
>>>       
>> That's what I thought, but that would mean 24 * 1280 * 720 * 60 = 1260
>> Mbits/second going to the video card.  There'd be no way that would
>> work over PCI - it'd be dropping every other frame (not to mention
>> that X reports 32 bpp, so 24 seems low), but it seemd like there was
>> much less dropage than that.  So there's something I'm not accounting
>> for, but I don't know what (this is without XvMC).
>>     
>
> Just to confuse matters, I’m pretty sure I’ve driven my CRT at 
> 1600x1200 at 100hz from one of my PCI graphics cards, (CRTs been in storage 
> for 7 months, should get it back in a week so can check) this means that 
> under X the whole raw frame doesn’t get shoved from the CPU to the GPU 
> across the bus, I think this is the difference between the frame buffer 
> and a hardware accelerated 2D environment like X.
>   
I'd have to agree with this.  The specs of the cards say they do upwards 
of 1920x1088 or more.  It would seem illogical for a card to purport a 
specified resolution and not be able to deliver it.  I will probably be 
getting a PCI MX4000 in the next few weeks for my system and I will 
report back my results with HDTV playback to an SD TV.

Kevin