[MPlayer-users] Re: Blotchy Colors (revisited)

D Richard Felker III dalias at aerifal.cx
Thu Apr 3 16:54:34 CEST 2003

On Thu, Apr 03, 2003 at 12:00:36PM +0200, David Kuehling wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > For X11 the following modelines should work, provided that your
> > GFX-Cards supports interlaced modes, newer NVidia cards don't do that
> > anymore:
> Shouldn't a non-interlaced mode with half the y-resolution do the job as
> well?  Of course you would loose vertical sharpness...  I own a NVidia
> card without interlacing support and I'am considering building some
> VGA->TV converter

This is what I do with my g200, since the overlay does not work right
in interlaced modes.

> > Also, not all cards support dot clocks that low, for example my ATI
> > Rage128 Pro has a minimum dotclock of 12.5Mhz, so the 640x480 at 60i mode
> > doesn't work.
> Since X11 supports modes with arbitrary aspect ratio, this shouldn't
> pose a problem, as you could always define something like 1200x300 to
> get the dotclock up into the allowed range, right?  (but would require
> software/hardware scaling in mplayer).  Just want to make sure, I don't
> end up with a converter which is unusable with my NVidia...

Yeah, this should work.

> At `www.hut.fi/Misc/Electronics/circuits/vga2tv' I found also some very
> simple designs using RGB scart input instead of doing RGB->YUV
> conversion in hardware.  Did anybody try that?  Are there tradeoffs?

US/Japan/anywhere else with NTSC does not have SCART.


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