WinVNC Hooks

[W. Brian Blevins]

Steve,

> Date: Tue, 27 Jun 2000 18:03:35 -0500
> From: "Steve" <soc195 "at" home.com>
> Subject: RE: WinVNC Hooks
> 
> I have tried Poll Full Screen but that really slows everything down as I am
> on a cable modem at home and have my upload capped.  Thanks though

Keep in mind that the viewable contents of a "Hauppauge TV card"
probably
does not compress well at all using hextile.  Both hextile and the zlib
compression I'm working on are loss-less algorithms which work best with
computer displays, not analog (converted to digital) video images.  To
get
any real performance with this scenario, you will need to have the video
compressed with a lossy algorithm, like jpeg or mpeg.

I guess the other option, as you mentioned in the original email would
be to artificially lower the frame rate significantly.  Normally, the
VNC server should only send updates when requested by the client.  That
way, a slow connection naturally gets fewer updates.  However, if a
single update can block the connection for significant time, then this
still impact performance of other apps on the connection.

Have you tried using "PollUnderCursor"?  That way you could request
updates of the video card window with the cursor.

I think the old (xlib based) unix viewer had debug options that could
slow down the viewer's drawing and requests for updates.  Of course,
this also made the viewer less interactive when drawing.  So, at this 
point you are likely looking at having to write some code to make this
happen.

Good luck.

> 
> - -----Original Message-----
> From: owner-vnc-list "at" uk.research.att.com
> [mailto:owner-vnc-list "at" uk.research.att.com]On Behalf Of Jonathan Morton
> Sent: Tuesday, June 27, 2000 3:53 AM
> To: vnc-list "at" uk.research.att.com
> Subject: Re: WinVNC Hooks
> 
> 
> >I have a question that perhaps someone on the list can answer.  I am
> running
> >WinVNC on a Win 98 machine so I can connect from work to my house.  I have
> a
> >Hauppauge TV card whose video won't update all the time.  I was curious as
> >to what hook I should attempt to use to get "streaming" video.  I'd just
> >like the window to update somewhat continously (2 or 3 times a second).  It
> >is trivial, but I think it would be interesting.
> 
> Have you tried using "Poll Full Screen" in the server options?
> 
> - --------------------------------------------------------------
> from:     Jonathan "Chromatix" Morton

-- 
Brian 
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W. Brian Blevins, Senior Software Engineer, Tridia Corporation
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