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

Tobias Diedrich ranma at gmx.at
Thu Apr 3 12:52:49 CEST 2003

David Kuehling wrote:

> 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


> > 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).

Yes, as you can see in my examples I did that for the ATI card.

> 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?

Works great. Gives you probably the best picture you can get out of your

Tobias						PGP: http://9ac7e0bc.2ya.com
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