[mythtv-users] Hd Pvr playback jitter

MarcT myrdhn at gmail.com
Sun Jul 18 15:00:56 UTC 2010

> Don,
> Which deinterlacing method do you use? Also is the video HD or SD? Sorry I
> didn't download the videos.
> I'm capturing and playing from a diskless ATOM/ION based FE/BE combo to a
> NFS share.
> Playback is fine, until the ION starts to overheat. This heatwave is doing
> bad things to my system, it is fanless as well, and the wife says we don't
> need an AC to cool off the house.
> MarcT
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I haven't paid much attention to the temperature; the box has seven 
fans, including one on the video board.  At the moment it's 63 degc (145 
degf).  The slowdown threshold (reported by nvidia-setttings) is 125 
degc, so I doesn't look like I'm very close to it.

I didn't know I had to pay attention to the de-interlacing settings.  
Good catch, that seems to make quite a difference.  It's using VDPAU 
rendering, and I assumed the default settings would be close enough, but 
maybe not.  I just switched the deinterlacers to "One Field (1x, HW)" 
and all the jitter went away.  I doubt this is how we want to leave it, 
so I'll do some experimenting with the settings.

Thanks for the tip, I think we're on the right track now.



This might be a good place to start.

According to the supported cards section of the wiki article your 8400GS is
a G98 chipset and should be able to do up to Temporal 2x. Advanced 1x and 2x
are out of your capabilities unless it's a SD recording.
Further down you will see other user experiences with certain card types, as
always take those with a grain of salt.


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