OT - s-video cables

[Benjamin Woenig]

I just got a Realmagic decoder card for my PC, and now have
loads of DVD's to start watching. Except my PC is in my study,
and the TV is in the lounge room. I want to run an s-video cable
from the study to the lounge room through the roof. No big deal
apart from spending half a day dangling cables between walls,
but my main concern is the cable. I need to run it about 15/18m.

How far can an s-video signal run before it starts degrading?
I have a heap of quality 4 core shielded cable that I was planning
on using, but I don't want to go to all this trouble and fine I haven't
got enough signal at the other end!

Anyone have any links to the specs for s-video? (its a 4 pin miniture
din plug/socket btw)

~bud