[mythtv-users] OT:? GeForce MX4000 and TV Out oddness

Michael T. Dean mtdean at thirdcontact.com
Sun Nov 20 13:23:40 EST 2005

SpEnT wrote:

>>I'd say don't waste your time fixing it.  Most likely, you don't want to
>>use an S-Video cable on the 57" TV because S-Video limits you to NTSC
>>(and NTSC is almost 52-year-old technology--it turns 52 on Dec 17).
>>Instead, get a more appropriate cable (VGA/DVI, depending on your TV)
>>and a good modeline and never look back.  Assuming it's a 57" 720p TV,
>>set it up with 1280x720 pixels.  If it's a 57" 1080p TV, set it up with
>>1920x1080 pixels.
>Thanks Mike, I'm going to take this advice. I ordered a DVI-HDMI cable
>yesterday so hopefully this helps. I think when I checked the TV
>settings it showed it as a 1080i so I'll see if I can get the
>1920x1080 resolution once I get the cable in. I'll post back with
>successes/failures or future trouble shooting  :-)
>Incidentally I don't suppose you have a mode line for 1080i? I used to
>have a link to a site that calculated mode lines but I can't seem to
>find it. If not I'll just google more. Thanks again,
1080i is an input signal type.  Any HD-capable set (i.e. HDTV or HD 
monitor) can accept 1080i input because it's one of the 18 mandatory 
formats required by the ATSC specification ( 
http://www.hdtvprimer.com/ISSUES/what_is_ATSC.html ).

Assuming it's a fixed-pixel, high-definition display (i.e. DLP, LCD, 
...), the TV will either be a 720p or a 1080p.  If it was purchased 
before July 2005, it's definitely a 720p.  If it's a brand new model, it 
might be a 1080p display.  However, if it is a 1080p display, you may 
not be able to use DVI (mine only supports 1920x1080 via VGA--the DVI 
input will only take 1080i).

If it's a CRT, you might be better off sending it a 1080i signal, but 
since it takes a digital input (i.e. DVI), it sounds like it's a digital 
display type (=not a CRT).  Also, 1080i might actually work better over 
component than over DVI.


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