[mythtv-users] What is your video ouput card for your tv ?

[Cory Papenfuss]

On Fri, 24 Feb 2006, Guillaume Membré wrote:

> Oh great, but what do you mean by "There is no "flicker-filtering" nonsense" ?
> What is your video card ?
>
>
 	The link you gave was about building a direct interface from the 
VGA port to a TV.  As such, it requires modelines that are compatible with 
TV frequencies... exactly half of VGA 640x480 for NTSC, and similar 50Hz 
for PAL.

 	Flicker-filters are additional processing on the frame-buffer 
interpolation engine that takes your real video raster on a card (e.g. 
800x600 at 75Hz) and re-samples it to TV frequencies (___x480 at 15.735kHz, 
29.97Hz, interlaced for NTSC).  They try to "guess" how they should 
resample vertically in a way to minimize flickering of horizontal lines. 
At best it reduces flicker of static, computer images and doesn't affect 
video playback much.  At worst it smears the frames together so badly that 
the static computer images are unreadable, and the video looks like it's a 
10th generation EP VCR recording.  Most video cards' implementations I've 
seen have been the latter.

 	When you connect directly, you don't (and can't) have that 
additional processing.  Truly WYSIWYG.  Many people are surprised when 
they see such high-quality rendition of TV-compatible frequencies... the 
ultra-high quality shows how bad regular TV is.

-Cory

-- 

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