[Telepathy] Video call with GTalk

[flower bean]

Hello,
     I use telepathy-qt4 to implement video call with GTalk protocal.
     I'm not sure if I need to launch camera by myself, if yes, does it use
the API org.maemo.Telepathy.StreamEngine.StartCamera()?
     I have called org.maemo.Telepathy.StreamEngine.AttachToChannel, do I
also need to call StartCamera/VideoPreviewSize etc. separatly ?

Thanks,
Cassie
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