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

[Brandon Stoll]

On 1/31/06, Jarod Wilson <jarod at wilsonet.com> wrote:
> On Tuesday 31 January 2006 10:47, Endaf Jones wrote:
> [...]
> > > > that's just VBI data. It's in every broadcast. You don't see it on your
> > > > regular TV with it's tuner because the mfr sets the overscan so high
> > > > that it's not seen. You can too. It's easy to do with the overscan
> > > > setting in mythtv frontend>>Utilities/Setup>>Setup>>TV
> > > > Settings>>Playback>>Overscan
> > > >
> > > > Set the Vertical over/underscan setting to something small like 2 or 4
> > > > and check your video playback. I play both NTSC and ATSC 6:9 and it
> > > > works fine.
> > >
> > > Or just use the custom filter "crop". I forget the exact parameters, but
> > > you basically specify how many pixels to chop off the top, bottom and
> > > sides. Details can be found in the list archives, I'm sure.
> >
> > If I'm not mistaken, the "crop" filter is in multiples of 16 pixels.
> > You can't just specify 6 pixels, you can only specify 0,16,32 ...
>
> Appears that you are correct about the multiples of 16 pixels (16 pixels == 1
> macroblock), but should be specified in macroblocks, not pixels, so your
> 0,16,32... example should actually be 0,1,2... At least, if I'm reading
> things right. I've never actually tried it out. :)
>
> > For a lot of people, that's just too much of the picture to remove.
> > Overscan is your best option I think in this case.  Unless something
> > has changed recently.
>
> If you're recording at full-resolution, chopping 16 pixels off the top doesn't
> seem so bad to me (you normally lose that many when watching SDTV anyhow),
> but I'd have to actually try it to see what I really think.
>
> --
> Jarod Wilson
> jarod at wilsonet.com
>
>

Thanks for info.  I thought my cable company was just insane.  I can't
believe I never thought of crop/overscan settings to fix the picture,
I feel really stupid now :D.