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-   -   Resolution with S-Video (http://www.nvnews.net/vbulletin/showthread.php?t=89470)

miltiad 04-09-07 02:40 AM

Resolution with S-Video

What is the maximum screen resolution with S-Video Output ?

Thank you.

Thunderbird 04-09-07 03:41 AM

Re: Resolution with S-Video
Composite and S-video are made for resolutions of upto about 800x600. Above that resolution you need relatively high frequency pixelclocks which the cables can't handle that well (leads to a lot of signal loss).

When you connect a tv using s-video the resolution the card outputs (in case of the integrated tvout encoder of Nvidia gpus) is 720x480 (NTSC) or 720x576 (PAL) no matter which resolution you specify in your xorg.conf. The image is scaled to fit into this view.

If you really want high resolutions for tvout (HDTV) you should use either component or hdmi/dvi.

rerushg 04-09-07 07:14 AM

Re: Resolution with S-Video
My card, 7900GS (EVGA), came with an S-video/component splitter that allowed HDTV resolutions with no apparent loss in quality versus DVI (in WinXP, Linux is another story).
That surprizes me; I would have expected such a splitter to use the DVI port. Is a DVI/component splitter in common use? Would it offer any advantage?

Thunderbird 04-09-07 09:35 AM

Re: Resolution with S-Video
Composite/S-VIDEO/Component are all analog ways of transporting data. DVI/HDMI are digital and work very differently.

miltiad 04-09-07 11:05 AM

Re: Resolution with S-Video
Thank you for your answer, I'll give it a try when I receive my HDMI cable.

pe1chl 04-09-07 03:52 PM

Re: Resolution with S-Video

Originally Posted by rerushg
My card, 7900GS (EVGA), came with an S-video/component splitter

Even though your component cable connects to the same connector as the S-video cable, the component signal is not split from the S-video signal.
The connector on the card contains both S-video and component outputs, that are partly independent.

Still, this splitter uses the output of the tvout encoder. Best quality can always be obtained directly from the videocard (DVI/VGA output) instead of via the tvout encoder.
Of course you need a display with DVI/VGA input for this. Some TV sets do have such an input.

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