[mythtv-users] Stupid overscan question

Cory Papenfuss papenfuss at juneau.me.vt.edu
Wed Nov 9 16:47:39 EST 2005


> I think that I may need to tweak fbset as documented
> here:
>
> http://forums.xbox-scene.com/lofiversion/index.php/t377567.html
>

 	If you wade through what they're discussing, it's just the 
framebuffer version of a modeline.  What is suggested:

fbset -g 640 440 640 440 32 -t 39721 40 24 52 31 96 2

results in a 640x440 modeline... with a total of 440+52+31+2 = 525
horizontal lines.  That's fine, and will be underscanned so it will appear 
"scanned" on your overscanned TV.  What will actually be happening is that 
mplayer|xine|mythtv|mythvideo will be rendering a 640x480 video onto a 
640x440 screen.  You will scaling the video... i.e. actual lines are not 
lines anymore, but an interpolated version of a couple of lines.

 	I'm not saying what you're doing is necessarily bad... just trying 
to clear up misinformation often rampant on the list about how to "fix" 
overscan with modelines.  In most cases, you're band-aiding a broken 
situation.

-Cory

-- 

*************************************************************************
* Cory Papenfuss                                                        *
* Electrical Engineering candidate Ph.D. graduate student               *
* Virginia Polytechnic Institute and State University                   *
*************************************************************************



More information about the mythtv-users mailing list