[mythtv-users] TV Overscan

Nick Rout nick.rout at gmail.com
Thu Feb 13 07:44:32 UTC 2014


On Thu, Feb 13, 2014 at 3:51 PM, Eric Sharkey <eric at lisaneric.org> wrote:
> On Wed, Feb 12, 2014 at 7:44 PM, Dick Steffens <dick at dicksteffens.com> wrote:
>> On 02/12/2014 03:47 PM, Hika van den Hoven wrote:
>>>
>>> Thursday, February 13, 2014, 12:28:41 AM, you wrote:
>>>>>
>>>>> I have a Panasonic TC-42PX14 Plasma TV. When using an HDMI input it has
>>>>> a 1260 x 720 display resolution. However, it also does overscan.
>>>
>>>> There are possibilities with adapted modelines, but that takes a lot
>>>> of testing and trial and error.
>
> I would try to avoid that method if you can.  If the TV is doing
> overscan, you're never going to get a good picture by tweaking the
> video card output.  The best you can do is compensate by shrinking the
> image down so that when the TV blows it up you don't lose the edges,
> but you definitely will lose sharpness by this.
>
> I'm sure you've read your TV's manual:
>
> http://service.us.panasonic.com/OPERMANPDF/TC42PX14.PDF
>
> Page 47 discusses the aspect ratio options.  The settings here should
> adjust the overscan, using either JUST or ZOOM.  You may need to play
> with it a bit to get it just right.
>
> If that doesn't work, then I would suggest you try switching to
> feeding the TV with analog VGA.  Usually TVs do not overscan video
> from a VGA input and the image quality of non-overscanned VGA is
> actually much higher than overscanned HDMI.

Maybe so, but I find a lot of TV screens seem to restrict VGA to silly
maximum resolutions like 1024x768.

>If you can't find any way
> to turn off the overscan, it's a simple option.
>
> Eric
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