I think that I may need to tweak fbset as documented here: http://forums.xbox-scene.com/lofiversion/index.php/t377567.html
--- Cory Papenfuss <[EMAIL PROTECTED]> wrote: > > So are you saying that I should use something else > > instead of 640x480? If so then what would you > > suggest? > > > What I'm saying is that if you're using a "tvout" > card, what your > computer renders is only loosely related to what > shows up on the TV. The > signal to the TV *MUST* be NTSC-compliant. That > means *exactly* 525 lines > drawn every 1/29.97th of a second, where each line > takes exactly > 1/15,734th of a second. The 640x480 pixels the > computer is rendering is > likely being spatially interpolated (in both horiz > and vert dimensions) by > the tvout chip on the video card so 1 pixel rendered > != 1 pixel displayed. > > The number of visible horizontal pixels can be > just about anything, so > long as it take 1/15734th of a second to draw a > whole line's worth of > them. One can pad the modeline horizontally to make > 640 or 720 or > whatever "visible" pixels visible. > > The number of vertical lines is *fixed* at 525/2 > per field... If > you draw 480 of them (the generally accepted number > of "visible" lines for > NTSC), the TV will draw some of them off the top > and/or bottom screen so > you cannot see them. If you use a "640x465" > resolution, the video player > will scale the presumably 480-line source into > 465-line output.... now the > video's been abused. > > Bottom line, overscanned is the way TVs have been > mal-adjusted > forever. The *correct* way to not have overscanning > is to adjust the TV > so it doesn't do it. > > -Cory > > > > I know that my TV is capable of displaying a > picture > > which fills the screen without the top being > slightly > > narrower than the bottom since the normal antenna > > input does so, as does the xBox boot screen. I've > > noticed that some xBox games have this resolution > > problem while some do not. I'm sure that there's > some > > setting in xorg.conf that will fix this but I am > not > > familiar enough with TV out to figure out what. > > > > Please let me know if you have any ideas, > > > Sounds like poor geometry control on the TV if > it's not a > rectangular picture. Again... overscanning hides > such misadjustments. > > -Cory > > -- > > ************************************************************************* > * Cory Papenfuss > * > * Electrical Engineering candidate Ph.D. graduate > student * > * Virginia Polytechnic Institute and State > University * > ************************************************************************* > > > _______________________________________________ > mythtv-users mailing list > [email protected] > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users > __________________________________ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
