[mythtv-users] Line of garbage at top of screen

David Abrahams dave at boost-consulting.com
Tue Jan 31 15:01:20 UTC 2006

David Watkins <watkinshome at gmail.com> writes:

> On 31/01/06, David Abrahams <dave at boost-consulting.com> wrote:
>> David Watkins <watkinshome at gmail.com> writes:
>> > On 30/01/06, David Abrahams <dave at boost-consulting.com> wrote:
>> >>
>> >> When I watch recorded material on OS X there's what looks like a one
>> >> (source) pixel line of seemingly random black and white pixels.  The
>> >> source material is fine; I don't see the garbage when I play it in
>> >> VLC.  Does anyone know where this comes from or what can be done about
>> >> it?  (Trac is down or I'd have made a ticket)
>> >
>> > It's teletext data (VBI I think is the proper name), streaming of text
>> > data within the video signal.  It was designed to be hidden in the bit
>> > of the picture you couldn't see on an analog television.
>> >
>> > AFAIK the only way to get rid of it is to tweak your overscan
>> > settings
>> Is that in one of the MythTV setup screens or are you talking about an
>> xorg/XFree86.conf?  I'm running this on a Mac, so neither of those
>> latter two are valid for me.
> Well for me it's a graphics card setting, set-up using the
> nvidia-settings programme.  I'm afraid I've never used a Mac, so I
> don't know what would be available.
> I seem to remember that there are some settings in the mythfrontend
> setup, related to setting offsets, screen sizes and overscan.  

Yeah, I found the "Y displacement" setting in the TV playback screens,

> Also an
> option to run myth in a window and control the windowsize.  

Nah, that would be too much of a PITA to be worth it.

> These might only apply to the menu screens though, rather that the
> video, but they could be worth a fiddle with.
> It must be a common situation so I'd be suprised if there wasn't an
> easy solution.

Looks like there is.

Thanks for your time.

Dave Abrahams
Boost Consulting

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