[mythtv-users] ATSC OTA HD-720 "intermittent black bars and speckled lines at the top" puzzle

Bill Meek keemllib at gmail.com
Sun May 23 00:47:19 UTC 2010

On Mon, 2010-05-17 at 11:43 -0500, Harry Coin wrote:
> I need help with an ATSC OTA puzzle.
> So, why does the playback insert so much black space on all sides and 
> not fill the screen?    Why the flickering black and white bars across 
> the top during the playback of some but not all shows but some but not 
> all commercials during shows with the problem?

A suggestion and a solution:

To see if its Myth thats adding the black space (as opposed to
the broadcaster) go to the Frontend Utilities/Setup, Setup, 
TV Settings, Playback, General Playback (2/8) and change
Letterbox Color from Black to Gray (if you already haven't.)

To get rid of the flickering (VBI), on the same page as above,
try a value of 2 in the Vertical Scaling setting.  That worked
for me.

When Greatly Enhanced Playback Groups gets implemented, you can
set the Vertical Scaling on a group bases rather than for all
shows (Trac 8088.)

Good luck,

Bill Meek

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