scan converters

Allan Kenneth Spale aspale1 at
Wed Jul 5 12:21:06 CDT 2000


During the June Chatauqua, EVL displayed a video stream that ported video  
directly from a Cray to the video capture card.  We did not have any
serious trouble related to capturing and maintaining the video stream.
The video quality was good, too.  Maybe someone else at EVL would
be able to comment more on this subject as I am only a node operator.


On Tue, 4 Jul 2000, Michael Grobe wrote:

> hello:
> the various complexities of using VNC for screen-sharing demos 
> got me to thinking about alternatives.
> has anyone tried using scan converters for these demos?
> that is, in more detail:
>    use a scan converter to take the VGA signal from a laptop
>    or workstation and convert it to composite video for the
>    video capture card for normal broadcast over the grid.
> this would be MUCH simpler than the VNC approach (especially the
> bi-level VNC approach invented by eric).  i suppose it would
> be considerably lower resolution, so it would be unusable for
> some demos or PPT slide sets.
> i have found a cheap scan converter...well, relatively cheap...
> $495 list price...i have a call in to see about an edu discount.
> for similar quality (VSC-75 or VSC-100) the Extron edu price 
> appears to be about $1000.
> the product is the CORIOscan Select from (
> (up to 1024x768, composite, s-video, and RGB output, ntsc and pal 
> switchable, scan rates up to 100KHz, etc.)
> if nothing else this MIGHT make a reasonable backup tool for VNC
> and dPPT, if it isn't good enough for general use.
> :michael grobe

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