[mythtv-users] Jerky video

HP-mini blm-ubunet at slingshot.co.nz
Mon Nov 18 18:42:52 UTC 2013


On Mon, 2013-11-18 at 08:34 -0800, DaveD wrote:
> On 11/17/2013 01:19 PM, HP-mini wrote:
> > hit <M> for playback menu then select "Playback" --> "Playback Data"
> 
> Wow!  Thanks for making me feel really stupid!  Some really good info there.
> 
> While playing back one of the shows I notice the problem on, video is 
> 1920x1080 at 29.97fps.  During simple playback (steady scene), FPS is 
> really close to 30.  When the scene changes or pans, it drops as low as 
> 22 fps, then recovers.  Is that normal?  No such variance on 720p (stays 
> within 1 fps of the 59.97).  On a different 1080i show (from the same 
> channel as the problem 1080i show), I don't notice the problem and it 
> stays much closer to 30.  I had to watch for a while just to see it drop 
> to 28 and, unlike the problem show, it compensates by briefly jumping up 
> to 31.  I never saw that on the problem show.
> 
> With such variation between shows from the same channel, I'm blaming the 
> network.  Comcast must not be doing it since the other show from the 
> same channel (different timeslot) has no problem.
> 
> Again, thanks for pointing out my inability to find things that are 
> obvious (my wife has to help me find links on web pages all the time!).
> 
> Dave D.
> 
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The GT210 is pretty hopeless for post-processing shaders (de-interlace,
scaling,denoise,sharpen)

If you have any shader options setup you could disable. The
de-interlacer settings can be changed during playback via playback OSD
menu "Video" --> "Advanced"  (I think).

If you find the you can't live without good PQ then..
I would recommend GT640. The Kepler GPU family has slower shaders
compared to the previous generation but is more power efficient.




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