S-Video TV-Out problem...

[Soulhunter]

I had connected my PC to my TV over composite cable some time now...

Never got problems so far !!!


Now I tried to plug a S-Video cable -> TV-Out -> S-Video cable -> SCART adapter -> TV

But now I get some sort of distortions on the TV screen...


Looks like colored horizontal stripes, but only sometimes n' only in "some" areas visible !!!

IIRC, they are mostly in detailed or bright areas visible !!!


Have already checked the cable n' the adapter !!!

Clue someone... :confused:


Tia, Soulhunter

[avih]

wild guess, but perhaps you could set the output limit to 16-235 ? (instead of 0-255).

[Soulhunter]

Would ffdshows "Levels -> Output" do this ???

When yes, Ive to report it doesn't not help... :(


Bye

[maciek_m]

I use the same combination (s-video out - scart in) and it works just fine without any special settings (Radeon 9200 VIVO).

I gather that you used the scart input before with other signal sources and it worked fine? How about trying the simplest thing in the world - getting a working cable from a friend and trying it out with your equipment (or sth of the kind, like putting your computer in the car and testing it with sb elses TV-set).

Or other things, like when I connected my graphics card to a TV for the first time I found out there are different PALs (PAL-B, PAL-C, PAL-D, etc) and they all semed to work o.k. Perhaps if gave any of the other PALs a longer try I would have noticed distortions like you have?

[GrofLuigi]

Originally posted by Soulhunter

Clue someone...



Interlacing? (Some TV-out cards blur it)

GL

[Soulhunter]

Originally posted by maciek_m
I gather that you used the scart input before with other signal sources and it worked fine? How about trying the simplest thing in the world - getting a working cable from a friend and trying it out with your equipment (or sth of the kind, like putting your computer in the car and testing it with sb elses TV-set).

Or other things, like when I connected my graphics card to a TV for the first time I found out there are different PALs (PAL-B, PAL-C, PAL-D, etc) and they all semed to work o.k. Perhaps if gave any of the other PALs a longer try I would have noticed distortions like you have? As I wrote, the cable n' the SCART-adapter are ok and changing the PAL-standarts does not help !!!

So, it must have to do with the TV... :(

Ive 2 TV's, one has only composite in, the other SCART n' composite as well !!!

PC-Composite connection works on both TV's fawless...

The SCART one works fine with DVD-player n' VCR as source !!!

Maybe loop the input through my VCR to the TV could help ???

Originally posted by GrofLuigi
Interlacing? (Some TV-out cards blur it)
Nope... The same output with composite plugged works !!!


Bye

[maciek_m]

When I can't find my socks in the wardrobe I begin to look for them in the fridge ...

If the scart input has been tested positively and your s-video graphics card is also working fine (you have checked it with a s-video input of another TV, haven't you?)then it must be something wrong with the "interconnection" between s-video and scart. How about putting a metal screen around the place of connection of your s-video cable and the scart cable/plug?

Nothing else comes to my mind. If you figure it out finally, let us know. Good luck>

[Soulhunter]

Originally posted by maciek_m
When I can't find my socks in the wardrobe I begin to look for them in the fridge ...Mine are always in the microwave... :DOriginally posted by maciek_m
If the scart input has been tested positively and your s-video graphics card is also working fine (you have checked it with a s-video input of another TV, haven't you?)then it must be something wrong with the "interconnection" between s-video and scart.No, Ive no way to check if the GC's S-Video-Out works coz I have no TV with S-Video-In... :(Nothing else comes to my mind. If you figure it out finally, let us know. Good luck Thanks anyhow... I post back when I get the answer !!!


Bye

[maciek_m]

Guess what,

I just made a short test, results of whicht I am not able to explain either ...

I got 2 s-video cables: a short and a long one

When I use the long one to capture from my video player (scart TV output and then a special plug to which I can connect audio cinch cables + composite + s-video) I got full color picture. But if I use the short I got only b/w.

On the other hand, when I use my standalone DVD player as a source for capture, the short cable gives the full color picture (the long cable works fine with the DVD too).

Its dificult for me to use the short cable for TV output, but I might try if you want.

Under the circumstances there is only one conclusion:

All s-video cables are not made equal. Amen

[smok3]

dont know, i never had any problems when connecting radeons for people, maybe this page will give you some clues thought:
http://www.digit-life.com/articles2/radeon-tv-out/#p3
btw, i dont understand how can you feed s-video to scart at all? (unless there is some s-video 2 composite conversion going on in there, but in that case you just better use the composite out..)
http://www.geo.gr/geo-tech/scart_connector.htm

[theReal]

Ive 2 TV's, one has only composite in, the other SCART n' composite as well !!!

So, none of your TV's has a seperate S-Video in ??
Because then most certainly none of your TV's supports S-Video-in at all. In my experience all devices that support S-Video through SCART also have seperate S-Video connectors and all devices which don't have S-Video connectors also don't support S-Video through SCART.

[Soulhunter]

Originally posted by theReal
So, none of your TV's has a seperate S-Video in ??
Because then most certainly none of your TV's supports S-Video-in at all. In my experience all devices that support S-Video through SCART also have seperate S-Video connectors and all devices which don't have S-Video connectors also don't support S-Video through SCART. So, does this mean my S-Video -> SCART adapter doesn't make it compatible at all ???

Would a S-Video -> Composite (http://www.hifi-regler.de/shop/hama/hama_42738-adapter_s-video_cinch.php?SID=959b2c38390234b7627913e698fbe1dc) do this... :confused:


Bye

[theReal]

This adapter should do the trick (it's an active converter actually, not only an adapter).

[maciek_m]

@Soulhunter
There probably is something to what theReal says.

Although I use a S-video/SCART converter I do have a separate S-video input in my TV (I don't use it because it is at the side of the box and the cable would be visible).

But it still does not solve my short vs. long cable mystery I described before.

[Soulhunter]

Originally posted by theReal
This adapter should do the trick (it's an active converter actually, not only an adapter). Thanks... ;)


Bye

[smok3]

Originally posted by theReal
In my experience all devices that support S-Video through SCART also have seperate S-Video connectors thats interesting, i wasnt aware that s-video was added to scart ...

[theReal]

I just found a really nice site that explains it all, i.e. that for S-Video pins 15 (originally RGB Red) and 20 (composite) are used.

So it's quite clear that if pin 15 isn't connected inside your tv, you'll only get what is on pin 20: the luminance signal.

Even explains how to build an S-Video-Composite Adapter yourself:

http://www.geo.gr/geo-tech/scart_connector.htm

[Soulhunter]

Originally posted by theReal
Even explains how to build an S-Video-Composite Adapter yourself:

http://www.geo.gr/geo-tech/scart_connector.htm Think its time to put out my soldering iron... :D

THX n' BYE

[smok3]

Originally posted by theReal
Even explains how to build an S-Video-Composite Adapter yourself i did such some time ago, and it is working fine.

[rfmmars]

If you combine a S-video cables into one, you have now defeated the comb filter, and yes you will see color when the horizontal frequency approches the color sidebands and sub carrier frequency. It is also important that the chroma channel has the correct impedence load or other visual problems can arise.

richard

[Soulhunter]

Originally posted by rfmmars
It is also important that the chroma channel has the correct impedence load or other visual problems can arise.How to make sure it has... :confused:


Bye

[rfmmars]

Normally the input impedance is arould 50 to 75 ohms, however higher is better. Use a ohm meter to check between the center conductor and ground. On the input side, if you get no reading that is OK TOO.

On the output side lets say a vcr, lower the better and higher is bad! On the S-video out, you also need to check for a low figure.

A AB test would also give a clue. with the s-video Y channel to the composite imput to the next device, it will give you a black and white picture. Now connect the chroma lead to the Y channel.

If everything is ok, you will just see the color added, no smear or other artifacts.

richard

[Soulhunter]

Originally posted by rfmmars
Use a ohm meter to check between the center conductor and ground...Hehe, first I have to check out if someone in my acquaintance has such a thingy... :D


THX n' Bye

[rfmmars]

I very simple one can be bought at Radio Shack.

richard