[mythtv-users] mythfrontend is shearing video playback

Michael T. Dean mtdean at thirdcontact.com
Mon Mar 17 04:39:54 UTC 2008


On 03/17/2008 12:19 AM, John and Holly Klug wrote:
> Brad DerManouelian wrote:
>   
>> On Mar 16, 2008, at 8:52 PM, John and Holly Klug wrote:
>>> I am using the Nvidia proprietary driver (current AMD64) with Myth.
>>> Anytime there is some panning, I get a horizontal shearing of the
>>> video.  I have enabled glx vsync in nvidia-settings.  I have tried  
>>> NO_XV=1.
>> Sounds like you are viewing interlaced content on a progressive display.
>> http://www.mythtv.org/wiki/index.php/Interlaced_Output
> The TV says it is in 1080i.  The source was 1080i as well.
>   

That would be input format.

> Given what it does to horizontal lines on the desktop, I have to believe 
> it is in 1080i.
>   

Though the display itself is most likely 720p or 1080p.

> Stills have no problems, and the problems are noticable, and the 
> shearing increases as the object moves more quickly, and the tearing is 
> around the moving object.

Viewing interlaced content on an interlaced display often requires 
deinterlacing, too (but I don't feel like going into a list of reasons why).

But really, is it so hard to change a drop-down box to find out that, 
perhaps, this person who is offering you really good advice may actually 
know what he's talking about.  I know, I know.  You're too smart to be 
fooled into trying something that you're absolutely certain will not fix 
the problem.***

Mike


***Note, this sentiment is not specifically because of this post, but 
from reading a bunch of, "My system is perfectly configured and super 
powerful, but 0.21 is so slow that it can't even play back my circa-1993 
MPEG-1 video," and various other posts where people are completely 
ignoring the useful (and often correct) advice they're being given.  
This just happened to be the last post in the folder, so it's the one I 
clicked on.


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