I just set up Jitsi on another computer and did a few audio/video/screen sharing tests.
OS: Debian Testing and Debian Stable, both 32-bi, both using ALSA only.
Setup: 2 gmail accounts used, ilbc codec for sound, h264 for camera/shared desktop.
After i set up the zrtp options on the other computer (were all inactive by default) it went very well - using the ilbc codec + screen sharing with h264 (1280x1024 original size) the total bandwidth used was at ~17-30 KB/sec and good sound quality. Voice only was 7-9 KB/sec, mostly 7. Impressive.
There is an initial few seconds period during which the encryption is negotiated and in that timeframe you may not hear the other side, but in my case after the keys (4 characters and padlock) appeared, the sound was ok in both directions so no complaints here.
Likewise, after the screen sharing was activated i had to wait 10-15 seconds until the grey overlay was cleared and i was able to see the other desktop fully. Something similar was with the camera, only a bit faster.
Maybe this should be looked at because this was a bit long time to look ad a garbled greyish screen until it is "wiped" from left to right. But after these it worked well.
I also noticed that this time the shared desktop's aspect ratio seemed to be correct (5/4)?
In conclusion: the screen sharing needs some stability work, especially the remote control tends to be unstable at the moment and some disruption at initializing or cancelling of the sharing, but if stabilized, it will be a killer feature very useful for quick remote support.
All in all i was impressed. Good sound quality, low bandwidth screen sharing/webcam, remote control. All done over google talk. Nice.
O zi buna,