[mythtv-users] Fuzz in my video output

Brian Wood beww at beww.org
Mon Jun 19 20:28:56 UTC 2006


On Jun 19, 2006, at 2:01 PM, Nathan Smith wrote:

> Hey list,
>
> When I view TV (it is a QAM signal) in MythTV, at the top of the  
> screen
> there is a thin line of noise (it's about half an inch wide and  
> covers the
> entire top part of the screen, and it looks almost like a static  
> channel
> on a TV), and no configuration options that I've tried can get rid  
> of it.
> If I record shows, the noise even shows up on the recorded version.  
> The
> rest of the TV signal looks great, and channel browsing works  
> perfectly
> (the noise also shows up on every channel).
>
> I'm using an HD-5500 with the 2.6.16.20 kernel running Ubuntu 6.06/ 
> AMD64.
>
> Any ideas?

Just guessing, but:

It's probably being transmitted intentionally, it is data, in the  
digital equivalent of the vertical blanking interval.

Usually most TVs overscan just a bit to prevent this showing up in  
the picture.




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