[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [AVT] Comments on draft-boyaci-avt-app-sharing-00
Cullen,
thanks for your comments. Some quick responses below:
On Nov 14, 2008, at 8:52 PM, Cullen Jennings wrote:
I like the idea of an applications share protocol that can be set up
over SIP and glad to see this submission.
Few comments
At a high level, why not just standardize something like VNC. It
seems like this would be better than inventing something new.
We have tried this (our SIP client [sipc] can invoke vnc) - vnc is
difficult to integrate into a session-based system, has a rather
primitive security mechanism and a very narrow remote entry facility,
among other problems. We should probably create a note summarizing the
issues with vnc.
I also wondered about why run it over RTP vs just be it's own
protocol. It was not clear that RTP was a good match.
That's a fairly fundamental discussion we should have in more detail
soon... One could probably run most of RTP over just plain UDP (needed
to support multicast, which is very useful for teaching situations) or
TCP, but one would need many of the elements, such as payload
discrimination.
Timing synchronization with audio and video is probably the largest
reason to do this, but I'm ready to be convinced that either RTP
should be an optional transport (in addition to, say, MSRP).
Some more small details ... you might want to look at how X deals
with mouse and keyboard events - particularly compression of mouse
motion.
Make sure that you have some way for the protocol to send a CTRL-ALT-
DEL to the far side without the user actually having to
simultaneously press CTRL, ALT and DEL.
This seems potentially dangerous, albeit necessary for remote terminal
operation. Not sure how vnc handles this, for example.
You probably want your PLI to be able to specify a partial rectangle
to update.
Cullen in my individual contributor roll
_______________________________________________
Audio/Video Transport Working Group
avt at ietf.org
https://www.ietf.org/mailman/listinfo/avt
_______________________________________________
Audio/Video Transport Working Group
avt at ietf.org
https://www.ietf.org/mailman/listinfo/avt