Watching video using VNC

Mike Miller mbmiller "at" taxa.epi.umn.edu
Thu, 21 Mar 2002 16:57:26 +0000


On Thu, 21 Mar 2002, Christopher Tesla wrote:

> I find it very interesting that some applications bypass the system in
> this way.  I assumed (incorrectly, I guess) that VNC simply shows
> everything that the monitor shows.  Is this simply because that the
> video in application is a hardware solution, or do other graphical
> systems bypass VNC?  What about somebody playing a high-framerate FPS
> shooter on the machine downstairs...would I be able to watch someone
> play using VNC from another computer?  Or what about somebody playing a
> .MOV or .MPG file using a media player...would VNC pick that up?
>
> I am just trying to better understand how VNC recreates the monitor
> input, and see how many unusual applications I can apply it to!!


Think in terms of where the image is produced.  Your TV card adds the TV
image to the video stream after it has left the CPU and before it gets to
the monitor.  It's a hardware video player.  If you play DVDs on your
computer, you have the same problem.  If the card adds the DVD image, you
won't see it on VNC, but if the DVD stream is created by *software*, then
you will see it.  I don't know what an FPS shooter is, but the same logic
applies -- where does the video for the shooter get added to the video
output stream?  If it is added after the CPU, then it won't be in vnc.

Mike
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