[mythtv-users] Matrox G400 DualHead - Live TV is squashed

[Matt]

Joe V wrote:

>
>If I play the file back in a window (not full-screen),
>then I see the entire TV shot, with small borders on
>the top/bottom (quite livable), and a larger border on
>the left (still not too bad).
>
Ok, these are the borders that are caused by too much overscan on the 
capture card.  I believe the particular overscan settings that I'm 
talking about can only be adjusted from the initial setup GUI.  I think 
the overscan settings that you can adjust through the standard setup 
menus adjust the size and orientation of myth in general


>
>The interesting stuff happens when I switch to
>fullscreen (by hitting the "f" key) - all of a sudden,
>the right side of the video gets chopped (i.e. that
>station logo and picture is partly gone), as it is
>when watching "live" TV in MythTV.  Because of this,
>I'm guessing it has something to do with the Matrox
>G400.
>
>
>
>I've tried adjusting the horizontal
>overscan/underscan, and I just can't seem to get it to
>fill the screen.  This happens independantly of my
>framebuffer settings (fbset), which I can get to fill
>the screen.  I've tried this with and without the
>fbset command to see if that had some effect - it
>doesn't seem to.
>
In this case, I think your problem isn't lack of screen fill, but too much fill. This cropping of the display is probably caused by either the standard myth overscan settings, or the fbset settings.

 
Maybe give my fbset line a try, see if it helps any. ( I run at 640x480 so they will probably work best at that res )

fbset -fb /dev/fb0 -left 36 -right 6 -upper 52 -hslen 26 -lower 2

Since you're capturing at 480x480 I don't see any reason to run at a higher resolution. NTSC can't do a good job with anything higher anyway IMHO.