Watching video using VNC

"Beerse, Corné" cbeerse "at"
Thu, 21 Mar 2002 17:12:43 +0000

> -----Original Message-----
> A recent question regarding using VNC to view streaming media 
> caught my eye.
> I have a home network with several computers.  I regularly 
> use VNC to control
> machines from other machines.  Everything is W2K.
> I have a computer with a video-in card that is plugged into 
> my TV downstairs.
> I can run the video software and watch TV on the computer.  
> Sometimes I am
> working upstairs on my laptop and would like to have that 
> same function.  When
> I use VNC to access the TV computer it works fine but the 
> window that shows
> the video signal is black.

True: vnc reads the video memory. Your tv card does not use the video memory
but when the video driver is at a pixel which should come from the tv card,
it asks for the proper pixel at the tv card. (it can be pixel wise, block
wise or line wise, don't know for your config).

See if you tv card has an option to work with old (s)-vga cards. Then you
should be able to see the tv pictures but don't ask for the quality...

Then you have the screen update... That's an other story...

> I am assuming that VNC has trouble updating the screen fast 
> enough to show the
> video signal.  I am running everything as full-duplex 100Mb 
> on a managed
> switch, so the network is screaming.  Is there any way to 
> speed up the VNC
> refresh so that I can watch real-time video on the laptop upstairs?

As told, vnc does not see the video info since it is not in the video
memory. Try doing a screendump (<shift> <printscreen> and then paste the
image from the clipboard) while watching tv. I bet the dump has a black
screen too.

> Just a fun question!

No fun answer...
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