Why is Composite to Scart NOT the same as Scart to Composite?

Discussion in 'Windows Media Center' started by Gregory, Nov 17, 2004.

  1. Gregory

    Gregory Guest

    I have just bought 2 Belkin PureAV Composite to Scart cables assuming they
    would be the same as Scart to Composite. The Hauppauge tuners in my Media
    Center PC don't receive a signal when connected to my cable set top box using
    these cables.

    After much testing, I realised that it is because they are not Scart to
    Composite cables, but are Composite to Scart.

    Obviously I have to buy new cables, but does anyone know why the cables
    don't work?
    Gregory, Nov 17, 2004
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  2. Gregory

    Gregory Guest

    I forgot to say that the set top box has the scart output and the Hauppauge
    cards have the composite input
    Gregory, Nov 17, 2004
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  3. The SCART connector is both INPUT and OUTPUT connector _in one_. Pin 20 is
    Composite IN, pin 19 is Composite OUT. When you buy a Composite to SCART
    cable, the composite wire will be connected to SCART pin 20, whereas a
    SCART to Composite cable would have it connected to pin 19.

    Robert Schlabbach, Nov 17, 2004
  4. Gregory

    Gregory Guest

    Thanks for the reply - so ideally the cables would have a switch to change
    the direction of the inputs.

    Along the same vein, would you perhaps know the reason for the following:

    When using a scart to s-video adapter, and s-video cable to connect the
    set-top box to the Hauppauge tuner, the picture received by the tuner is
    black and white. When connected using composite video cable attached to the
    same scart adapter, the picture is colour. Why is this?

    I have had so much trouble with the above that I have ditched s-video in
    favour of composite video - and as described in the original thread, this has
    had its own problems.....
    Gregory, Nov 17, 2004
  5. I think the original SCART had not S-Video, and thus this had to be "hacked
    on" later: S-Video carries the black&white (Y) signal on one pin, and the
    color (C) signal on another.

    In "S-Video mode", the SCART composite input/output pins (20 and 19) change
    to the Y signal input/output pins. Pin 15, which is normally the "Red" pin
    for RGB mode, then becomes the C signal input/output - and thus has to be
    SWITCHED somewhere for the direction.

    So the SCART connector on your STB was apparently not correctly configured
    to S-Video output, i.e. it didn't deliver the C signal on pin 15, thus you
    only had a black&white picture. Try checking the configuration menus of
    your STB (or asking the manufacturer/supplier) if there is a way to
    configure the SCART connector to S-Video output.
    FWIW, S-Video may be better than composite, but not much... SCART RGB
    output gives much better signal quality than composite, but, unfortunately,
    there are no capture cards with RGB inputs available...

    Robert Schlabbach, Nov 17, 2004
  6. Gregory

    Stephen Neal Guest

    Whilst it isn't supported by Windows Media Center, there is an RGB analogue
    capture card out there. It is called the Sweetspot - they also make an SDI
    input card as well. It is primarily designed for people using HTPCs as
    scalers to feed HD projectors, plasmas etc. - but some software
    (Showshifter?) does support it for capture as well.

    Stephen Neal, Nov 17, 2004
  7. Gregory

    kalev- Guest


    To the OP: many STB's have configuration settings, to let the user decide if
    it's SCART connector should output S-video or composite. In my case, they
    did not tell the whole truth, it's a dual tuner: they re-broadcast with
    both DVB and analog channels. The analog channels are ALWAYS sent out as
    composite. So I can only send composite to the PVR-150MCE card. Like
    Robert said: I think the diff between composite and s-video is minimal and
    not something to cry about...

    The other SCART connector on my STB is set to output RGB -- sent directly to
    the TV. (The TV has 4 video inputs)

    kalev-, Nov 17, 2004
  8. Gregory

    kalev- Guest

    To be abit more clear: when a analog channel is selected, both the STB and
    the TV automatically drop down to composite. Using a SCART to SCART

    kalev-, Nov 17, 2004
  9. Gregory

    Gregory Guest

    Thanks for the info.


    Gregory, Nov 18, 2004
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