[mythtv-users] Cannot find a good HDTV Modeline

[Doug Larrick]

Shay - MythTV wrote:
>> Modeline "1080i" 79.84 1920 2040 2200 2368 1080 1090 1106 1125
>> +vsync -hsync interlace
>> 
>> This one and a few other 1080i's are just a bit big on all edges,
>> so I lose part of the desktop.  I'd also like to stay away from
>> interlaced but for now this is the best I can find.

540p is the same to your set as 1080i, but non-interlaced (and half the 
resolution in each direction).  540pw (as I call it) is the full 1920 
pixels wide, which means the pixels are rectangular.  Myth can use this 
for video output, but the UI and X look bad; you can use the "Use 
separate video modes for GUI and playback" setting to do just that.

Modeline "540p" 39.956     960 1020 1100 1184    540 550 551 563  +hsync 
+vsync # 39.956 MHz 33.75 kHz 59.94 Hz
# 1920X540, pseudo-1080i, 2x 540p's H timings
Modeline "540pw" 79.912   1920 2040 2200 2368    540 550 551 563  +hsync 
+vsync # 79.912 MHz 33.75 kHz 59.94 Hz

You can play around with the 1st (pixel size) and 2nd (start of sync 
pulse, i.e. position; move 3rd by the same amound) numbers in the H and 
V sections of these modelines.  This is the only way to reduce overscan 
and stay within the ATSC standard modes for vertical timings.  For 
horizontal timing, you just need to make sure the first number (pixel 
clock in MHz) divided by the 4th horizontal number stays near 33.75 KHz.

Or you can search in your set's menus and service menu for overscan 
adjustments and fix it that way.

-Doug
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