Video calling is a quite complex technical issue, with a lot of components needing to work together from audio and video acquisition on your local machine, integrating with your address book, negotiating the call between the parties involved, putting everything into RTP packets on one side and unpacking and displaying them on the other side, taking into account the network, firewalls and and audio and video sync. So in order for a call to work you will need (among others) ALSA, PulseAudio, V4L2, GStreamer, Evolution Data Server, Farstream, libnice, the XMPP server, Telepathy and Empathy to work together across two different systems. And if you want to interoperate with a 3rd party system like GTalk the list of components that all need to work perfectly with each other grows further.

#ttgfgn

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