[mythtv-users] Video noise or distortion across very top edge of image

Johnny Walker johnnyjboss at gmail.com
Wed Nov 25 22:17:23 UTC 2009

On Fri, Nov 20, 2009 at 10:59 AM, Brian J. Murrell
<brian at interlinx.bc.ca> wrote:
> On Fri, 2009-11-20 at 10:49 -0600, Johnny Walker wrote:
>> Channel 222 is CNN Headline News (love my Robin Meade). I am seeing
>> some sort of video noise or distortion across what seems to be the
>> very top pixel of my playback image. This happens in LiveTV and also
>> on Recording.
> Are you overscanning on playback or are you displaying every single
> pixel of the captured picture inside your viewable area on the playback?
> Hiding this sort of "edge distortion" is what overscan is for.
>> I tried adjusting the Vertical offset in the Setup-->Playback menu. I
>> moved it from 0 through 10 (trying each incrementally) and I wasn't
>> able to notice any difference. It does seem that each time I invoke
>> the LiveTv mode I may get a more or less dramatic experience of this
>> noise.
> Can you not make the video hardware do the overscanning?  I do this with
> my 5200FX, admittedly in a pure analog output stream.  Maybe using VDPAU
> restricts this video card driven overscanning?
> I set up the overscanning on mine with nvidia-settings.  I basically
> tuned it until what I was seeing coming from Myth matched exactly what I
> saw watching native television.

I have updated to the latest Nvidia driver and all I have is OverScan
compensation where I can make the image smaller. I am unable to make
the image grow so that this line of data would be off the screen.

Any tips from anyone else on this?

> b.
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