[AG-TECH] 4 x S-video capture?

[Markus Buchhorn]

At 08:02 AM 28/03/2007, Derek Piper wrote:
>Exactly, I was wanting to find out if it's possible to have more than just composite video to capture from.

Not that I've seen; all the 4 port (4 receiver!) cards around at the moment seem to be composite only (spectra8, falcon and ivc). Everything that takes S-video also seems to take composite, and so they run out of space on the back of the board. 4 s-video alone should fit though. Osprey does a nice breakout box, but again single line capture only.

You do get a win though if you use the s-video cable to take the s-video signal from the camera to the capture board and convert just before it; the main issue I believe is loss along the length of the cable, and the luma/chroma separation on s-video helps that (as long as it's a good s-video cable, which are more expensive). Converting to a merged composite signal just outside the board causes some loss, so it's not ideal, but it's better than a composite signal the whole way (whether on coax with BNC, or on simple core/shield with single RCA connector).

I'd also love a 4port/4receiver s-video board; would free up slots :-) Anybody know a friendly manufacturer?

Cheers,
        Markus


>Derel
>
>Quoting Paul Bonnett <P.Bonnett at ukerna.ac.uk>:
>
>>Jason & others,
>>
>>Beware of 'simple' adaptors, most don't carry both the lines across for
>>true S-Video.
>>However if you started off with a BNC output you only have a composite
>>signal to start with, so it won't give you any improvement.
>>http://en.wikipedia.org/wiki/S-Video
>>
>>Paul B
>>
>>
>>-----Original Message-----
>>From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov] On
>>Behalf Of Jason Bell
>>Sent: 26 March 2007 23:17
>>To: Derek Piper
>>Cc: ag-tech
>>Subject: RE: [AG-TECH] 4 x S-video capture?
>>
>>Derek
>>
>>One thing I use is a simple converter from BNC to S-video (RCA).
>>
>>Cheers,
>>Jason.
>>
>>-----Original Message-----
>>From: Derek Piper [mailto:dcpiper at indiana.edu]
>>Sent: Tuesday, 27 March 2007 1:47 AM
>>To: ag-tech
>>Subject: [AG-TECH] 4 x S-video capture?
>>
>>
>>        Hi,
>>
>>        I was wondering if anyone here knows of any card that can has 4
>>S-video
>>ports for capturing from 4 S-video sources at once with one card? The
>>ones I've used (and liked) have been composite via BNC connections. The
>>S-video is something I'm wondering about.
>>
>>        Thanks,
>>
>>        Derek
>>
>>--
>>Derek Piper - dcpiper at indiana.edu - (812) 856 0111
>>IRI 323, School of Informatics
>>Indiana University, Bloomington, Indiana
>>
>
>
>
>--
>Derek Piper - dcpiper at indiana.edu - (812) 856 0111
>IRI 323, School of Informatics
>Indiana University, Bloomington, Indiana
>
>