[mythtv-users] Jerky video

Bert Haskins bhaskins at chartermi.net
Mon Nov 18 19:10:24 UTC 2013


On 11/18/2013 01:42 PM, HP-mini wrote:
> 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.
Thanks for the tip!
There are even fanless GT640s!

Guess that I now know what I want for Christmas.

>
>
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