can VNC transmit pc- television pictures?

[Seak, Teng-Fong]

> -----Message d'origine-----
> De : Ed Lockett [mailto:e.lockett "at" cmyk.uk.com]
> Envoyi : mardi 2 mars 2004 11:43
> @ : vnc-list "at" realvnc.com
> Objet : RE: can VNC transmit pc- television pictures?
> 
>[snipped]
> 
> At any rate, I do not think it's likely (even on a LAN) that you would want
> to watch TV or a film in this way, the quality would just be too poor. There

	Yup, a little calculation/estimation could show us.  If we take a small sized video, 320 x 240 pixels, using 24bit colours without compression and playing at 25 frames / second, then the transfer rate is
	320 x 240 x 24 x 25 = 44 Mbps
and this has to be in *sustain* mode or the video would be jerky.

	The highest ADSL rate I know of is just 2Mbps while the usual entry-level is just about 128 kbps.  And even at 2Mbps, nothing can guarantee a constant rate.  I don't know how much VNC can compress, but since it has to be a lossless compression, it can't be very high.

	So good video over VNC isn't for today yet :-)

> are third party applications which can stream video over a network from
> various sources. You should chack these out, one I read about a while back
> seemed to be quite impressive. Can't remember the name now though. There is
> also a component called media services in windows server, but I am not sure
> of its exact capabilities.