[mythtv-users] HDTV playback specs?
matt at goebelnet.com
Sat Sep 2 20:08:19 UTC 2006
I've just upgraded to an HDTV DCT6200 cable box from my cable company.
Using firewire and MythTV's built in DCT6200 support I'm able to
watch/record all my HDTV channels, premium (HBO/Showtime/Etc) and
otherwise, as well as all the regular SD and digital channels. The
problem.. while HDTV playback is *almost* smooth it still shudders, gets
out of sync with audio, and sometimes there is that "snowy" pixel
effect. It not that bag, but even a little makes things annoying. Here
are my system specs:
AMD 64 2000+
DFI nForce 2 based motherboard
NVidia FX5200 /w 128MB (AGP)
Generic firewire card (NEC chipset)
Onboard gigabit NIC - (100Mb connected but could be 1Gb, don't see a
point since SD recording only used 5Mb/s per tuner, even if HDTV is 10x
80GB ATA/133 drive (all recording on a NFS 4 network share.)
All this system does is MythTV.
Watching HDTV my CPU usage runs anywhere from 35% to 85%. The norm is
~75%. Memory and disk i/o is almost nill. This is with XvMC enabled,
Bob2x deinterlacing, frontend running with root privileges. I've also
set the nvidia options in xorg.conf :
Option "RenderAccel" "1"
Option "NVAGP" "1"
Option "XvmcUsesTextures" "false"
Recording HDTV /w out playback I see 3% CPU usage. Watching HDTV from
my much faster master backend is flawless.
So given all this what has been people's experience? Can I get
completely smooth playback with these specs somehow? An option I am
missing etc? If not what's the most worthwhile part to upgrade?
I have a couple ideas:
1. Replace my FX5200 /w a fanless 6200 with 256MB ~$50 (enough of an
2. Replace with a fast Socket A CPU ~$100 (enough?)
3. Both 1 and 2
4. Use a first gen Nforce 4 board I have laying around (Socket 939) and
buy an ~ AMD 64 3200+, 1-2GB PC3200 DDR.. all new PCIe 6200 - ~$$$
I'd prefer not spend all that much since all I want is a MythTV frontend.
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